AHMET NİHAT BERKER

Professor
 AHMET NİHAT BERKER

Rektör Danışmanı
Mühendislik ve Doğa Bilimleri Fakültesi Dekanı

D BLOK 2. KAT 211.1

+90 (212) 533 65 32 / 1400-1134

nihatberker@khas.edu.tr

https://webprs.khas.edu.tr/~nberker

ORCID

Education

Doctorate

UNIVERSTY OF ILLİNOİS at URBANA-CHAMPAIGN
Fizik

Master's Degree

MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Fizik

Bachelor's Degree

MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Fizik- Kimya

Research Areas

  • İstatiksel Fizik
  • Faz Geçişleri ve Kritik Olgular
  • Spin Camları ve Diğer Karmaşık Sistemler
  • Etnomüzikte, Beyin Sinyallerinde ve Spin Camı Kaosunda Fraktal Yapılar
  • Renormalizasyon Grubu Yöntemleri

Work Experience

2018 / Continuing Mühendislik ve Doğa Bilimleri Fakültesi Dekanı, Rektör Yardımcısı
Kadir Has Üniversitesi

2009 / 2016 Rektör
Sabancı Üniversitesi

2005 / 2008 Fizik Profesörü
Koç Üniversitesi

2004 / Continuing Emeritus Fizik Profesörü
MIT

1999 / 2005 Fen-Edebiyat Fakültesi Dekanı, Fizik Bölümü Başkanı
İstanbul Teknik Üniversitesi

1979 / 2004 Öğretim Üyesi
MIT

1977 / 1979 Doktora Sonrası Araştırmacı
Harvard Üniversitesi

Publications

  • "Nematic phase of the n-component cubic-spin spin glass in d = 3: Liquid-crystal phase in a dirty magnet",
    Artun, E. Can; Sarman, Deniz; Berker, A. Nihat; Physica A: Statistical Mechanics and its Applications, (2024) Vol.640, DOI: 10.1016/j.physa.2024.129709
  • "Axial, planar-diagonal, body-diagonal fields on the cubic-spin spin glass in d=3: A plethora of ordered phases under finite fields",
    Artun, E. Can; Sarman, Deniz; Berker, A. Nihat; Physical Review E, (2024) Vol.110, No.3, DOI: 10.1103/PhysRevE.110.034123
  • "Reentrant ferromagnetic ordering of the random-field Heisenberg model in d>2 dimensions: Fourier-Legendre renormalization-group theory",
    Türkoǧlu, Alpar; Berker, A. Nihat; Physical Review E, (2024) Vol.109, No.1, DOI: 10.1103/PhysRevE.109.014114
  • "Global Ashkin–Teller phase diagrams in two and three dimensions: Multicritical bifurcation versus double tricriticality—endpoint",
    Keçoğlu, Ibrahim; Berker, A. Nihat; Physica A: Statistical Mechanics and its Applications, (2023) Vol.630, DOI: 10.1016/j.physa.2023.129248
  • "Driven and non-driven surface chaos in spin-glass sponges",
    Pektaş, Yiğit Ertaç; Artun, E. Can; Berker, A. Nihat; Chaos, Solitons and Fractals, (2023) Vol.176, DOI: 10.1016/j.chaos.2023.114159
  • "Multifractal spin-glass chaos projection and interrelation of multicultural music and brain signals",
    Artun, E. Can; Keçoğlu, Ibrahim; Türkoğlu, Alpar; Berker, A. Nihat; Chaos, Solitons and Fractals, (2023) Vol.167, DOI: 10.1016/j.chaos.2022.113005
  • "COVID-19 modeling based on real geographic and population data",
    Baysazan, Emir; Berker, A. Nihat; Mandal, Hasan; Kaygusuz, Hakan; Turkish Journal of Medical Sciences, (2023) Vol.53, No.1, 333-339 DOI: 10.55730/1300-0144.5589
  • "Nematic ordering in the Heisenberg spin-glass system in three dimensions",
    Tunca, Egemen; Berker, A. Nihat; Physical Review E, (2023) Vol.107, No.1, DOI: 10.1103/PhysRevE.107.014116
  • "Merged Potts-clock model: Algebraic and conventional multistructured multicritical orderings in two and three dimensions",
    Artun, E. Can; Berker, A. Nihat; Physical Review E, (2023) Vol.108, No.2, DOI: 10.1103/PhysRevE.108.024116
  • "Renormalization-group theory of the Heisenberg model in d dimensions",
    Tunca, Egemen; Berker, A. Nihat; Physica A: Statistical Mechanics and its Applications, (2022) Vol.608, DOI: 10.1016/j.physa.2022.128300
  • "Lower critical dimension of the random-field XY model and the zero-temperature critical line",
    Akln, Kutay; Berker, A. Nihat; Physical Review E, (2022) Vol.106, No.1, DOI: 10.1103/PhysRevE.106.014151
  • "First-order to second-order phase transition changeover and latent heats of q -state Potts models in d =2,3 from a simple Migdal-Kadanoff adaptation",
    Devre, H. Yaǧlz; Berker, A. Nihat; Physical Review E, (2022) Vol.105, No.5, DOI: 10.1103/PhysRevE.105.054124
  • "Asymmetric phase diagrams, algebraically ordered Berezinskii-Kosterlitz-Thouless phase, and peninsular Potts flow structure in long-range spin glasses",
    Gürleyen, S. Efe; Berker, A. Nihat; Physical Review E, (2022) Vol.105, No.2, DOI: 10.1103/PhysRevE.105.024122
  • "Electric-field induced phase transitions in capillary electrophoretic systems",
    Kaygusuz, Hakan; Erim, F. Bedia; Berker, A. Nihat; Physics of Fluids, (2021) Vol.33, No.10, DOI: 10.1063/5.0065824
  • "Spin- spin-glass phases in the Ising model",
    Artun, E. Can; Berker, A. Nihat; Physical Review E, (2021) Vol.104, No.4, DOI: 10.1103/PhysRevE.104.044131
  • "Phase transitions of the variety of random-field Potts models",
    Türkoğlu, Alpar; Berker, A. Nihat; Physica A: Statistical Mechanics and its Applications, (2021) Vol.583, DOI: 10.1016/j.physa.2021.126339
  • "Fractal measures of sea, lake, strait, and dam-reserve shores: Calculation, differentiation, and interpretation",
    Yılmazer, Dilara; Berker, A. Nihat; Yılmaz, Yücel; Physica A: Statistical Mechanics and its Applications, (2021) Vol.579, DOI: 10.1016/j.physa.2021.126106
  • "Metastable Potts droplets",
    Artun, E. Can; Berker, A. Nihat; Physical Review E, (2021) Vol.103, No.3, DOI: 10.1103/PhysRevE.103.032102
  • "The effect of weekend curfews on epidemics: A monte carlo simulation",
    Kaygusuz, Hakan; Berker, A. Nihat; Turkish Journal of Biology, (2021) Vol.45, No.Special Issue 1, 436-441 DOI: 10.3906/biy-2105-69
  • "Complete density calculations of q -state Potts and clock models: Reentrance of interface densities under symmetry breaking",
    Artun, E. Can; Berker, A. Nihat; Physical Review E, (2020) Vol.102, No.6, DOI: 10.1103/PhysRevE.102.062135
  • "Across dimensions: Two- And three-dimensional phase transitions from the iterative renormalization-group theory of chains",
    Keçoǧlu, Ibrahim; Berker, A. Nihat; Physical Review E, (2020) Vol.102, No.3, DOI: 10.1103/PhysRevE.102.032134
  • "Frustrated Potts model: Multiplicity eliminates chaos via reentrance",
    Türkoǧlu, Alpar; Berker, A. Nihat; Physical Review E, (2020) Vol.102, No.2, DOI: 10.1103/PhysRevE.102.022122
  • "Metastable reverse-phase droplets within ordered phases: Renormalization-group calculation of field and temperature dependence of limiting size",
    Eren, Ege; Berker, A. Nihat; Physical Review E, (2020) Vol.101, No.4, DOI: 10.1103/PhysRevE.101.042127
  • "Lower lower-critical spin-glass dimension from quenched mixed-spatial-dimensional spin glasses",
    Atalay, Bora; Berker, A. Nihat; Physical Review E, (2018) Vol.98, No.4, DOI: 10.1103/PhysRevE.98.042125
  • "Maximally random discrete-spin systems with symmetric and asymmetric interactions and maximally degenerate ordering",
    Atalay, Bora; Berker, A. Nihat; Physical Review E, (2018) Vol.97, No.5, DOI: 10.1103/PhysRevE.97.052102
  • "Phase transitions between different spin-glass phases and between different chaoses in quenched random chiral systems",
    Çaǧlar, Tolga; Berker, A. Nihat; Physical Review E, (2017) Vol.96, No.3, DOI: 10.1103/PhysRevE.96.032103
  • "Devil's staircase continuum in the chiral clock spin glass with competing ferromagnetic-antiferromagnetic and left-right chiral interactions",
    Çaǧlar, Tolga; Berker, A. Nihat; Physical Review E, (2017) Vol.95, No.4, DOI: 10.1103/PhysRevE.95.042125
  • "Chiral Potts spin glass in d=2 and 3 dimensions",
    Çaǧlar, Tolga; Berker, A. Nihat; Physical Review E, (2016) Vol.94, No.3, DOI: 10.1103/PhysRevE.94.032121
  • "Stepwise positional-orientational order and the multicritical-multistructural global phase diagram of the s=3/2 Ising model from renormalization-group theory",
    Yunus, Çaǧln; Renklioǧlu, Başak; Keskin, Mustafa; Berker, A. Nihat; Physical Review E, (2016) Vol.93, No.6, DOI: 10.1103/PhysRevE.93.062113
  • "Successively thresholded domain boundary roughening driven by pinning centers and missing bonds: Hard-spin mean-field theory applied to d=3 Ising magnets",
    Çaʇlar, Tolga; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2015) Vol.92, No.6, DOI: 10.1103/PhysRevE.92.062131
  • "Lower-critical spin-glass dimension from 23 sequenced hierarchical models",
    Demirtaş, Mehmet; Tuncer, Asll; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2015) Vol.92, No.2, DOI: 10.1103/PhysRevE.92.022136
  • "Odd q -state clock spin-glass models in three dimensions, asymmetric phase diagrams, and multiple algebraically ordered phases",
    Ilker, Efe; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2014) Vol.90, No.6, DOI: 10.1103/PhysRevE.90.062112
  • "Overfrustrated and underfrustrated spin glasses in d=3 and 2: Evolution of phase diagrams and chaos including spin-glass order in d=2",
    Ilker, Efe; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2014) Vol.89, No.4, DOI: 10.1103/PhysRevE.89.042139
  • "High q-state clock spin glasses in three dimensions and the Lyapunov exponents of chaotic phases and chaotic phase boundaries",
    Ilker, Efe; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2013) Vol.87, No.3, DOI: 10.1103/PhysRevE.87.032124
  • "Deep spin-glass hysteresis-area collapse and scaling in the three-dimensional ±j Ising model",
    SarIyer, Ozan S.; KabakçIoǧlu, Alkan; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2012) Vol.86, No.4, DOI: 10.1103/PhysRevE.86.041107
  • "Universality aspects of the d=3 random-bond Blume-Capel model",
    Malakis, A.; Berker, A. Nihat; Fytas, N. G.; Papakonstantinou, T.; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2012) Vol.85, No.6, DOI: 10.1103/PhysRevE.85.061106
  • "Interface-roughening phase diagram of the three-dimensional Ising model for all interaction anisotropies from hard-spin mean-field theory",
    Çaǧlar, Tolga; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2011) Vol.84, No.5, DOI: 10.1103/PhysRevE.84.051129
  • "Phase separation and charge-ordered phases of the d=3 Falicov-Kimball model at nonzero temperature: Temperature-density-chemical potential global phase diagram from renormalization-group theory",
    SarIyer, Ozan S.; Hinczewski, Michael; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (2011) Vol.84, No.20, DOI: 10.1103/PhysRevB.84.205120
  • "Theory and simulations of water flow through carbon nanotubes: Prospects and pitfalls",
    Bonthuis, Douwe Jan; Rinne, Klaus F.; Falk, Kerstin; Nadir Kaplan, C.; Horinek, Dominik; Nihat Berker, A.; Bocquet, Lydéric; Netz, Roland R.; Journal of Physics Condensed Matter, (2011) Vol.23, No.18, DOI: 10.1088/0953-8984/23/18/184110
  • "Tensor renormalization group: Local magnetizations, correlation functions, and phase diagrams of systems with quenched randomness",
    Güven, Can; Hinczewski, Michael; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2010) Vol.82, No.5, DOI: 10.1103/PhysRevE.82.051110
  • "Comment on "Pumping of confined water in carbon nanotubes by rotation-translation coupling"",
    Bonthuis, D. J.; Falk, K.; Kaplan, C. N.; Horinek, D.; Berker, A. N.; Bocquet, L.; Netz, R. R.; Physical Review Letters, (2010) Vol.105, No.20, DOI: 10.1103/PhysRevLett.105.209401
  • "Uncovering the secrets of the 2D random-bond Blume-Capel model",
    Malakis, A.; Nihat Berker, A.; Hadjiagapiou, I. A.; Fytas, N. G.; Papakonstantinou, T.; Physica A: Statistical Mechanics and its Applications, (2010) Vol.389, No.15, 2930-2933 DOI: 10.1016/j.physa.2009.12.064
  • "Comment on "spin-glass attractor on tridimensional hierarchical lattices in the presence of an external magnetic field"",
    Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2010) Vol.81, No.4, DOI: 10.1103/PhysRevE.81.043101
  • "Multicritical points and crossover mediating the strong violation of universality: Wang-Landau determinations in the random-bond d=2 Blume-Capel model",
    Malakis, A.; Berker, A. Nihat; Hadjiagapiou, I. A.; Fytas, N. G.; Papakonstantinou, T.; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2010) Vol.81, No.4, DOI: 10.1103/PhysRevE.81.041113
  • "Wang-Landau study of the 2d random-bond Blume-Capel model",
    Malakis, A.; Nihat Berker, A.; Hadjiagapiou, I. A.; Fytas, N. G.; Physics Procedia, (2010) Vol.3, No.3, 1443-1446 DOI: 10.1016/j.phpro.2010.01.204
  • "Frustrated further-neighbor antiferromagnetic and electron-hopping interactions in the d=3 t-J model: Finite-temperature global phase diagrams from renormalization group theory",
    Kaplan, C. Nadir; Berker, A. Nihat; Hinczewski, Michael; Physical Review B - Condensed Matter and Materials Physics, (2009) Vol.80, No.21, DOI: 10.1103/PhysRevB.80.214529
  • "Viscoelastic effect on acoustic band gaps in polymer-fluid composites",
    Merheb, B.; Deymier, P. A.; Muralidharan, K.; Bucay, J.; Jain, M.; Aloshyna-Lesuffleur, M.; Greger, R. W.; Mohanty, S.; Berker, A.; Modelling and Simulation in Materials Science and Engineering, (2009) Vol.17, No.7, DOI: 10.1088/0965-0393/17/7/075013
  • "Critical percolation phase and thermal Berezinskii-Kosterlitz-Thouless transition in a scale-free network with short-range and long-range random bonds",
    Berker, A. Nihat; Hinczewski, Michael; Netz, Roland R.; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2009) Vol.80, No.4, DOI: 10.1103/PhysRevE.80.041118
  • "Infinitely robust order and local order-parameter tulips in Apollonian networks with quenched disorder",
    Kaplan, C. Nadir; Hinczewski, Michael; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2009) Vol.79, No.6, DOI: 10.1103/PhysRevE.79.061120
  • "Quenched-vacancy induced spin-glass order",
    GülpInar, Gül; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2009) Vol.79, No.2, DOI: 10.1103/PhysRevE.79.021110
  • "Strong violation of critical phenomena universality: Wang-Landau study of the two-dimensional Blume-Capel model under bond randomness",
    Malakis, A.; Berker, A. Nihat; Hadjiagapiou, I. A.; Fytas, N. G.; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2009) Vol.79, No.1, DOI: 10.1103/PhysRevE.79.011125
  • "Chaotic spin correlations in frustrated Ising hierarchical lattices",
    Aral, Neşe; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (2009) Vol.79, No.1, DOI: 10.1103/PhysRevB.79.014434
  • "Elastic and viscoelastic effects in rubber/air acoustic band gap structures: A theoretical and experimental study",
    Merheb, B.; Deymier, P. A.; Jain, M.; Aloshyna-Lesuffleur, M.; Mohanty, S.; Berker, A.; Greger, R. W.; Journal of Applied Physics, (2008) Vol.104, No.6, DOI: 10.1063/1.2980330
  • "Blume-Emery-Griffiths spin glass and inverted tricritical points",
    Özçelik, V. Ongun; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2008) Vol.78, No.3, DOI: 10.1103/PhysRevE.78.031104
  • "Finite-temperature phase diagram of nonmagnetic impurities in high-temperature superconductors using a d=3tJ model with quenched disorder",
    Hinczewski, Michael; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (2008) Vol.78, No.6, DOI: 10.1103/PhysRevB.78.064507
  • "Multicritical points for spin-glass models on hierarchical lattices",
    Ohzeki, Masayuki; Nishimori, Hidetoshi; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2008) Vol.77, No.6, DOI: 10.1103/PhysRevE.77.061116
  • "Reentrant and forward phase diagrams of the anisotropic three-dimensional Ising spin glass",
    Güven, Can; Berker, A. Nihat; Hinczewski, Michael; Nishimori, Hidetoshi; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2008) Vol.77, No.6, DOI: 10.1103/PhysRevE.77.061110
  • "Excitation spectrum gap and spin-wave velocity of XXZ Heisenberg chains: Global renormalization-group calculation",
    Sariyer, Ozan S.; Berker, A. Nihat; Hinczewski, Michael; Physical Review B - Condensed Matter and Materials Physics, (2008) Vol.77, No.13, DOI: 10.1103/PhysRevB.77.134413
  • "Quantum-mechanically induced asymmetry in the phase diagrams of spin-glass systems",
    Kaplan, C. Nadir; Berker, A. Nihat; Physical Review Letters, (2008) Vol.100, No.2, DOI: 10.1103/PhysRevLett.100.027204
  • "High-precision thermodynamic and critical properties from tensor renormalization-group flows",
    Hinczewski, Michael; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2008) Vol.77, No.1, DOI: 10.1103/PhysRevE.77.011104
  • "Field-driven hysteresis of the d=3 Ising spin glass: Hard-spin mean-field theory",
    Yücesoy, Burcu; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (2007) Vol.76, No.1, DOI: 10.1103/PhysRevB.76.014417
  • "D = 3 anisotropic and d = 2 tJ models: Phase diagrams, thermodynamic properties, and chemical potential shift",
    Hinczewski, M.; Berker, A. N.; European Physical Journal B, (2006) Vol.51, No.4, 461-472 DOI: 10.1140/epjb/e2006-00258-x
  • "Inverted Berezinskii-Kosterlitz-Thouless singularity and high-temperature algebraic order in an Ising model on a scale-free hierarchical-lattice small-world network",
    Hinczewski, Michael; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2006) Vol.73, No.6, DOI: 10.1103/PhysRevE.73.066126
  • "Two superconducting phases in the d =3 Hubbard model : Phase diagram and specific heat from renormalization-group calculations",
    Hinczewski, M.; Berker, A. N.; European Physical Journal B, (2005) Vol.48, No.1, 1-17 DOI: 10.1140/epjb/e2005-00376-y
  • "Multicritical point relations in three dual pairs of hierarchical-lattice Ising spin glasses",
    Hinczewski, Michael; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (2005) Vol.72, No.14, DOI: 10.1103/PhysRevB.72.144402
  • "Phase diagrams and crossover in spatially anisotropic d=3 Ising, XY magnetic, and percolation systems: Exact renormalization-group solutions of hierarchical models",
    Erbaş, Aykut; Tuncer, Asli; Yücesoy, Burcu; Berker, A. Nihat; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2005) Vol.72, No.2, DOI: 10.1103/PhysRevE.72.026129
  • "Scaling of thermal hysteresis at nematic-smectic-A phase transition in a binary mixture",
    Yildiz, Sevtap; Pekcan, Önder; Nihat Berker, A.; Özbek, Haluk; Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2004) Vol.69, No.3 1, DOI: 10.1103/PhysRevE.69.031705
  • "High-degeneracy ordering of polyampholyte gels from a random-field model",
    Aalberts, Daniel P.; Berker, A. Nihat; ARI Bulletin of the Istanbul Technical University, (2003) Vol.53, No.1, 2-5
  • "Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique",
    Özbek, Haluk; Yildiz, Sevtap; Pekcan, Önder; Hepuzer, Yeşim; Yaǧci, Yusuf; Berker, A. Nihat; Galli, Giancarlo; Chiellini, Emo; Phase Transitions, (2003) Vol.76, No.12, 991-998 DOI: 10.1080/0141159031000156454
  • "High-degeneracy ordering of polyampholyte gels from a random-field model",
    Aalberts, Daniel P.; Berker, A. Nihat; Bulletin of the Technical University of Istanbul, (2003) Vol.53, No.1, 2-5
  • "Smectic A-C-A liquid crystal reentrance: A photon transmission study",
    Özbek, Haluk; Yildiz, Sevtap; Pekcan, Önder; Nihat Berker, A.; Phase Transitions, (2002) Vol.75, No.3, 301-308 DOI: 10.1080/01411590290020420
  • "A phase diagram of smectogen-non-smectogen binary mixture: A photon transmission study",
    Yildiz, S.; Serhatli, I. E.; Pekcan, Ö; Berker, A. N.; Özbek, H.; International Journal of Modern Physics B, (2002) Vol.16, No.26, 3959-3970 DOI: 10.1142/S0217979202013122
  • "The A-C-A phase diagram of mixed liquid crystals: A photon transmission study",
    Özbek, Haluk; Yildiz, Sevtap; Pekcan, Önder; Nihat Berker, A.; International Journal of Modern Physics B, (2001) Vol.15, No.15, 2161-2167 DOI: 10.1142/S0217979201004952
  • "Finite-temperature phase diagram of the Hubbard model",
    Migliorini, G.; Berker, A. Nihat; European Physical Journal B, (2000) Vol.17, No.1, 3-6 DOI: 10.1007/s100510070153
  • "The renormalization-group microscope: The local statistical mechanics of heterogeneous systems",
    Yeşilleten, Dicle; Berker, A. Nihat; Turkish Journal of Physics, (1999) Vol.23, No.1, 77-87
  • "Global random-field spin-glass phase diagrams in two and three dimensions",
    Migliorini, Gabriele; Berker, A. Nihat; Turkish Journal of Physics, (1999) Vol.23, No.1, 269
  • "Strongly asymmetric tricriticality of quenched random-field systems",
    Kabakçioglu, Alkan; Berker, A. Nihat; Physical Review Letters, (1999) Vol.82, No.12, 2572-2574 DOI: 10.1103/PhysRevLett.82.2572
  • "Global random-field spin-glass phase diagrams in two and three dimensions",
    Migliorini, Gabriele; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (1998) Vol.57, No.1, 426-431 DOI: 10.1103/PhysRevB.57.426
  • "Strong violation of critical phenomena universality under quenched bond randomness",
    Falicov, Alexis; Berker, A. Nihat; Turkish Journal of Physics, (1997) Vol.21, No.1, 59-63
  • "Renormalization-group calculation of local magnetizations and correlations: Random-bond, random-field, and spin-glass systems",
    Yeşilleten, Dicle; Berker, A. Nihat; Physical Review Letters, (1997) Vol.78, No.8, 1564-1567 DOI: 10.1103/PhysRevLett.78.1564
  • "Renormalization-group study of superfluidity and phase separation of helium mixtures immersed in a disordered porous medium",
    Lopatnikova, Anna; Berker, A. Nihat; Physical Review B - Condensed Matter and Materials Physics, (1997) Vol.56, No.18, 11865-11871 DOI: 10.1103/PhysRevB.56.11865
  • "Tricritical and critical end-point phenomena under random bonds",
    Falicov, Alexis; Berker, Nihat; Physical Review Letters, (1996) Vol.76, No.23, 4380-4383 DOI: 10.1103/PhysRevLett.76.4380
  • "Correlated random-chemical-potential model for the phase transitions of helium mixtures in porous media",
    Falicov, Alexis; Berker, A. Nihat; Physical Review Letters, (1995) Vol.74, No.3, 426-429 DOI: 10.1103/PhysRevLett.74.426
  • "Finite-temperature phase diagram of the t-J model: Renormalization-group theory",
    Falicov, Alexis; Berker, A. Nihat; Physical Review B, (1995) Vol.51, No.18, 12458-12463 DOI: 10.1103/PhysRevB.51.12458
  • "Renormalization-group theory of the random-field Ising model in three dimensions",
    Falicov, Alexis; Berker, A. Nihat; McKay, Susan R.; Physical Review B, (1995) Vol.51, No.13, 8266-8269 DOI: 10.1103/PhysRevB.51.8266
  • "Spin-wave bound-state energies from an Ising model",
    Aalberts, Daniel P.; Berker, A. Nihat; Physical Review B, (1994) Vol.49, No.2, 1073-1078 DOI: 10.1103/PhysRevB.49.1073
  • "Closed-form solutions and free energy of hard-spin mean-field theory of a fully frustrated system",
    Kabakçioglu, Alkan; Nihat Berker, A.; Cemal Yalabik, M.; Physical Review E, (1994) Vol.49, No.4, 2680-2683 DOI: 10.1103/PhysRevE.49.2680
  • "Critical behavior induced by quenched disorder",
    Nihat Berker, A.; Physica A: Statistical Mechanics and its Applications, (1993) Vol.194, No.1-4, 72-76 DOI: 10.1016/0378-4371(93)90341-Z
  • "Phase diagram of the Ising model on the square lattice with crossed diagonal bonds",
    Berker, A. Nihat; Hui, Kenneth; Physical Review B, (1993) Vol.48, No.17, 12393-12398 DOI: 10.1103/PhysRevB.48.12393
  • "Renormalization-group theory of an internal critical-end-point structure: The Blume-Emery-Griffiths model with biquadratic repulsion",
    Netz, Roland R.; Berker, A. Nihat; Physical Review B, (1993) Vol.47, No.22, 15019-15022 DOI: 10.1103/PhysRevB.47.15019
  • "Non-equilibrium molecular dynamics (NEMD) simulations and the rheological properties of liquid n-hexadecane",
    Berker, Ali; Chynoweth, Simon; Klomp, Ulfert C.; Michopoulos, Yanos; Journal of the Chemical Society, Faraday Transactions, (1992) Vol.88, No.13, 1719-1725 DOI: 10.1039/FT9928801719
  • "Smectic-C order, in-plane domains, and nematic reentrance in a microscopic model of liquid crystals",
    Netz, Roland R.; Berker, A. Nihat; Physical Review Letters, (1992) Vol.68, No.3, 333-336 DOI: 10.1103/PhysRevLett.68.333
  • "Monte Carlo mean-field theory and frustrated systems in two and three dimensions",
    Netz, Roland R.; Berker, A. Nihat; Physical Review Letters, (1991) Vol.66, No.3, 377-380 DOI: 10.1103/PhysRevLett.66.377
  • "Alerhand et al. Reply",
    Alerhand, O. L.; Nihat Berker, A.; Joannopoulos, J. D.; Vanderbilt, David; Hamers, R. J.; Demuth, J. E.; Physical Review Letters, (1991) Vol.66, No.7, 962 DOI: 10.1103/PhysRevLett.66.962
  • "Hard-spin mean-field theory: Formulation for Ising, XY, and other models",
    Netz, Roland R.; Berker, A. Nihat; Journal of Applied Physics, (1991) Vol.70, No.10, 6074-6076 DOI: 10.1063/1.350050
  • "Absence of temperature-driven first-order phase transitions in systems with random bonds (invited)",
    Berker, A. Nihat; Journal of Applied Physics, (1991) Vol.70, No.10, 5941-5945 DOI: 10.1063/1.350086
  • "Dimensionality effects on the multicritical phase diagrams of the Blume-Emery-Griffiths model with repulsive biquadratic coupling: Mean-field and renormalization-group studies",
    Hoston, William; Berker, A. Nihat; Journal of Applied Physics, (1991) Vol.70, No.10, 6101-6103 DOI: 10.1063/1.350059
  • "Netz and Berker reply [1]",
    Netz, Roland R.; Berker, A. Nihat; Physical Review Letters, (1991) Vol.67, No.13, 1808 DOI: 10.1103/PhysRevLett.67.1808
  • "Multicritical phase diagrams of the blume-emery-griffiths model with repulsive biquadratic coupling",
    Hoston, William; Berker, A. Nihat; Physical Review Letters, (1991) Vol.67, No.8, 1027-1030 DOI: 10.1103/PhysRevLett.67.1027
  • "Random-field mechanism in random-bond multicritical systems (abstract)",
    Hui, Kenneth; Berker, A. Nihat; Journal of Applied Physics, (1990) Vol.67, No.9, 5991 DOI: 10.1063/1.346040
  • "Harris criterion for direct and orthogonal quenched randomness",
    Berker, A. Nihat; Physical Review B, (1990) Vol.42, No.13, 8640-8642 DOI: 10.1103/PhysRevB.42.8640
  • "Finite-temperature phase diagram of vicinal Si(100) surfaces",
    Alerhand, O. L.; Berker, A. Nihat; Joannopoulos, J. D.; Vanderbilt, David; Hamers, R. J.; Demuth, J. E.; Physical Review Letters, (1990) Vol.64, No.20, 2406-2409 DOI: 10.1103/PhysRevLett.64.2406
  • "Erratum: Random-Field Mechanism in Random-Bond Multicritical Systems (Physical Review Letters (1989) 63,21 (2433))",
    Hui, Kenneth; Berker, A. Nihat; Physical Review Letters, (1989) Vol.63, No.21, 2433 DOI: 10.1103/PhysRevLett.63.2433
  • "Pressure studies on phase transitions in 4-alkoxyphenyl-4",
    Raja, V. N.; Ratna, B. R.; Shashidhar, R.; Heppke, G.; Bahr, Ch; Marko, J. F.; Indekeu, J. O.; Berker, A. Nihat; Physical Review A, (1989) Vol.39, No.8, 4341-4344 DOI: 10.1103/PhysRevA.39.4341
  • "Random-field mechanism in random-bond multicritical systems",
    Hui, Kenneth; Berker, A. Nihat; Physical Review Letters, (1989) Vol.62, No.21, 2507-2510 DOI: 10.1103/PhysRevLett.62.2507
  • "Mixtures in the frustrated spin-gas theory of reentrant polar liquid crystals",
    Marko, J. F.; Indekeu, J. O.; Berker, A. Nihat; Physical Review A, (1989) Vol.39, No.8, 4201-4206 DOI: 10.1103/PhysRevA.39.4201
  • "Equimagnetization lines in the hybrid-order phase diagram of the d=3 random-field Ising model (invited)",
    McKay, Susan R.; Berker, A. Nihat; Journal of Applied Physics, (1988) Vol.64, No.10, 5785-5786 DOI: 10.1063/1.342230
  • "Reentrant transition enthalpies of liquid crystals: The frustrated spin-gas model and experiments",
    Indekeu, J. O.; Berker, A. Nihat; Chiang, C.; Garland, C. W.; Physical Review A, (1987) Vol.35, No.3, 1371-1375 DOI: 10.1103/PhysRevA.35.1371
  • "Molecular tail lengths, dipole pairings, and multiple reentrance mechanisms of liquid crystals",
    Indekeu, J. O.; Berker, A. Nihat; Physica A: Statistical Mechanics and its Applications, (1986) Vol.140, No.1-2, 368-375 DOI: 10.1016/0378-4371(86)90243-8
  • "Quadruple reentrance (nematic-smectic-Ad-nematic-smectic-Ad-nematic- smectic-A1) from the frustrated spin-gas model of liquid crystals",
    Indekeu, J. O.; Berker, A. Nihat; Physical Review A, (1986) Vol.33, No.2, 1158-1162 DOI: 10.1103/PhysRevA.33.1158
  • "Modified hyperscaling relation for phase transitions under random fields",
    Berker, A. Nihat; McKay, Susan R.; Physical Review B, (1986) Vol.33, No.7, 4712-4715 DOI: 10.1103/PhysRevB.33.4712
  • "Summary Abstract: Theory of reentrant melting of krypton adsorbed on graphite",
    Caflisch, Robert G.; Berker, A. Nihat; Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, (1985) Vol.3, No.3, 1592-1593 DOI: 10.1116/1.573138
  • "Reentrant melting of krypton adsorbed on graphite and the helical Potts-lattice-gas model",
    Caflisch, Robert G.; Nihat Berker, A.; Kardar, Mehran; Physical Review B, (1985) Vol.31, No.7, 4527-4537 DOI: 10.1103/PhysRevB.31.4527
  • "Orderings and renormalization-group flows of a stacked frustrated triangular system in three dimensions",
    Nihat Berker, A.; Grest, Gary S.; Soukoulis, C. M.; Blankschtein, Daniel; Ma, M.; Journal of Applied Physics, (1984) Vol.55, No.6, 2416-2418 DOI: 10.1063/1.333680
  • "Chaotic spin glasses: An upper critical dimension (invited)",
    McKay, Susan R.; Berker, A. Nihat; Journal of Applied Physics, (1984) Vol.55, No.6, 1646-1648 DOI: 10.1063/1.333429
  • "Hierarchical models and chaotic spin glasses",
    Berker, A. Nihat; McKay, Susan R.; Journal of Statistical Physics, (1984) Vol.36, No.5-6, 787-793 DOI: 10.1007/BF01012938
  • "Oxygen chemisorbed on Ni(100): A renormalization-group study of the global phase diagram",
    Caflisch, Robert G.; Berker, A. Nihat; Physical Review B, (1984) Vol.29, No.3, 1279-1286 DOI: 10.1103/PhysRevB.29.1279
  • "Magnetic susceptibilities of cluster-hierarchical models",
    McKay, Susan R.; Berker, A. Nihat; Physical Review B, (1984) Vol.29, No.3, 1315-1320 DOI: 10.1103/PhysRevB.29.1315
  • "Biaxial order in liquid crystals and their mixtures: A Potts-Ising model",
    Caflisch, Robert G.; Chen, Zhong Ying; Nihat Berker, A.; Deutch, John M.; Physical Review A, (1984) Vol.30, No.5, 2562-2567 DOI: 10.1103/PhysRevA.30.2562
  • "Ordering under random fields: Renormalization-group arguments",
    Berker, A. Nihat; Physical Review B, (1984) Vol.29, No.9, 5243-5245 DOI: 10.1103/PhysRevB.29.5243
  • "Orderings of a stacked frustrated triangular system in three dimensions",
    Blankschtein, Daniel; Ma, M.; Berker, A. Nihat; Grest, Gary S.; Soukoulis, C. M.; Physical Review B, (1984) Vol.29, No.9, 5250-5252 DOI: 10.1103/PhysRevB.29.5250
  • "Scale-invariant quenched disorder and its stability criterion at random critical points",
    Andelman, David; Berker, A. Nihat; Physical Review B, (1984) Vol.29, No.5, 2630-2635 DOI: 10.1103/PhysRevB.29.2630
  • "Fully and partially frustrated simple-cubic Ising models: Landau-Ginzburg-Wilson theory",
    Blankschtein, Daniel; Ma, M.; Berker, A. Nihat; Physical Review B, (1984) Vol.30, No.3, 1362-1365 DOI: 10.1103/PhysRevB.30.1362
  • "Erratum: Cratering due to surface defects in the Gaussian model (The Journal of Chemical Physics (1983) 78 (529))",
    Nowak, Ernst; Deutch, J. M.; Berker, A. Nihat; The Journal of Chemical Physics, (1983) Vol.78, No.11, 7017 DOI: 10.1063/1.444624
  • "Critical behavior of the three-state Potts model: Monte Carlo renormalization group",
    Swendsen, Robert H.; Berker, A. Nihat; Physical Review B, (1983) Vol.28, No.7, 3897-3903 DOI: 10.1103/PhysRevB.28.3897
  • "STUDY OF HIGH ORDER RECONSTRUCTIONS OF THE Si(100) SURFACE.",
    Ihm, J.; Lee, D. H.; Joannopoulos, J. D.; Berker, A. N.; Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, (1983) Vol.1, No.3, 705-708 DOI: 10.1116/1.582584
  • "Hyperscaling and crossover exponents near the percolation threshold",
    Gefen, Y.; Aharony, A.; Shapir, Y.; Berker, A. Nihat; Journal of Physics C: Solid State Physics, (1982) Vol.15, No.24, DOI: 10.1088/0022-3719/15/24/001
  • "First- and second-order phase transitions in Potts models: Competing mechanisms (invited)",
    Berker, A. Nihat; Andelman, David; Journal of Applied Physics, (1982) Vol.53, No.11, 7923-7926 DOI: 10.1063/1.330231
  • "Amorphously packed, frustrated hierarchical models: Chaotic rescaling and spin-glass behavior",
    McKay, Susan R.; Berker, A. Nihat; Kirkpatrick, Scott; Journal of Applied Physics, (1982) Vol.53, No.11, 7974-7976 DOI: 10.1063/1.330246
  • "Commensurate-incommensurate phase diagrams for overlayers from a helical potts model",
    Kardar, M.; Berker, A. Nihat; Physical Review Letters, (1982) Vol.48, No.22, 1552-1555 DOI: 10.1103/PhysRevLett.48.1552
  • "Scaling for first-order phase transitions in thermodynamic and finite systems",
    Fisher, Michael E.; Berker, A. Nihat; Physical Review B, (1982) Vol.26, No.5, 2507-2513 DOI: 10.1103/PhysRevB.26.2507
  • "Cratering due to surface defects in the Gaussian model",
    Nowak, Ernst; Deutch, J. M.; Berker, A. Nihat; The Journal of Chemical Physics, (1982) Vol.78, No.1, 529-535 DOI: 10.1063/1.444478
  • "Random-field effects in metamagnet tricritical-point measurements",
    Birgeneau, Robert J.; Berker, A. Nihat; Physical Review B, (1982) Vol.26, No.7, 3751-3757 DOI: 10.1103/PhysRevB.26.3751
  • "Exact criticality condition for randomly layered Ising models with competing interactions on a square lattice",
    Kardar, M.; Berker, A. Nihat; Physical Review B, (1982) Vol.26, No.1, 219-225 DOI: 10.1103/PhysRevB.26.219
  • "Spin-glass behavior in frustrated Ising models with chaotic renormalization-group trajectories",
    McKay, Susan R.; Berker, A. Nihat; Kirkpatrick, Scott; Physical Review Letters, (1982) Vol.48, No.11, 767-770 DOI: 10.1103/PhysRevLett.48.767
  • "Q-state Potts models in d dimensions: Migdal-Kadanoff approximation",
    Andelman, D.; Berker, A. N.; Journal of Physics A: Mathematical and General, (1981) Vol.14, No.4, DOI: 10.1088/0305-4470/14/4/005
  • "Critical exponents and marginality of the four-state Potts model: Monte Carlo renormalization group",
    Swendsen, Robert H.; Andelman, D.; Berker, A. Nihat; Physical Review B, (1981) Vol.24, No.11, 6732-6735 DOI: 10.1103/PhysRevB.24.6732
  • "Frustrated spin-gas model for doubly reentrant liquid crystals",
    Berker, A. N.; Walker, James S.; Physical Review Letters, (1981) Vol.47, No.20, 1469-1472 DOI: 10.1103/PhysRevLett.47.1469
  • "First- and second-order phase transitions of infinite-state Potts models in one dimension",
    Berker, A. N.; Andelman, D.; Aharony, A.; Journal of Physics A: Mathematical and General, (1980) Vol.13, No.11, DOI: 10.1088/0305-4470/13/11/007
  • "Erratum: Ground-state entropy and algebraic order at low temperatures (Journal of Physics A: Mathematical and General (1980) 13 (L263))",
    Berker, A. N.; Kadanoff, L. P.; Journal of Physics A: Mathematical and General, (1980) Vol.13, No.12, 3786 DOI: 10.1088/0305-4470/13/12/530
  • "Ground-state entropy and algebraic order at low temperatures",
    Berker, A. N.; Kadanoff, L. P.; Journal of Physics A: Mathematical and General, (1980) Vol.13, No.7, L259-L264 DOI: 10.1088/0305-4470/13/7/008
  • "Island growth and orientational locking of potassium intercalated in graphite",
    Berker, A. N.; Kambe, N.; Dresselhaus, G.; Dresselhaus, M. S.; Physical Review Letters, (1980) Vol.45, No.17, 1452-1456 DOI: 10.1103/PhysRevLett.45.1452
  • "Intercalate layer structure in graphite-alkali metal compounds",
    Dresselhaus, M. S.; Kambe, N.; Berker, A. N.; Dresselhaus, G.; Synthetic Metals, (1980) Vol.2, No.1-2, 121-131 DOI: 10.1016/0379-6779(80)90037-5
  • "Structural transitions between epitaxially ordered phases in adsorbed submonolayers",
    Ostlund, S.; Berker, A. N.; Physical Review B, (1980) Vol.21, No.11, 5410-5423 DOI: 10.1103/PhysRevB.21.5410
  • "Renormalisation-group calculations of finite systems: Order parameter and specific heat for epitaxial ordering",
    Berker, A. N.; Ostlund, S.; Journal of Physics C: Solid State Physics, (1979) Vol.12, No.22, 4961-4975 DOI: 10.1088/0022-3719/12/22/035
  • "Two-dimensional XY magnets with annealed non-magnetic impurities",
    Berker, A. N.; Nelson, David R.; Journal of Applied Physics, (1979) Vol.50, No.B3, 1799-1801 DOI: 10.1063/1.327173
  • "A binding site model of membrane transport: Binary and cooperative flows",
    Lee, M. Howard; Berker, A. Nihat; Stanley, H. Eugene; Essig, Alvin; The Journal of Membrane Biology, (1979) Vol.50, No.3-4, 205-224 DOI: 10.1007/BF01868889
  • "First- and second-order phase transitions in Potts models: Renormalization-group solution",
    Nienhuis, B.; Berker, A. N.; Riedel, Eberhard K.; Schick, M.; Physical Review Letters, (1979) Vol.43, No.11, 737-740 DOI: 10.1103/PhysRevLett.43.737
  • "Multicritical phase diagram of gases adsorbed on graphite: Temperature variation and finite-size effects",
    Ostlund, S.; Berker, A. N.; Physical Review Letters, (1979) Vol.42, No.13, 843-846 DOI: 10.1103/PhysRevLett.42.843
  • "Superfluidity and phase separation in helium films",
    Berker, A. N.; Nelson, David R.; Physical Review B, (1979) Vol.19, No.5, 2488-2503 DOI: 10.1103/PhysRevB.19.2488
  • "Renormalization-group treatment of a Potts lattice gas for krypton adsorbed onto graphite",
    Berker, A. N.; Ostlund, S.; Putnam, F. A.; Physical Review B, (1978) Vol.17, No.9, 3650-3665 DOI: 10.1103/PhysRevB.17.3650
  • "Exact renormalization group with Griffiths singularities and spin-glass behavior: The random Ising chain",
    Grinstein, G.; Berker, A. N.; Chalupa, J.; Wortis, Michael; Physical Review Letters, (1976) Vol.36, No.25, 1508-1511 DOI: 10.1103/PhysRevLett.36.1508
  • "Blume-Emery-Griffiths-Potts model in two dimensions: Phase diagram and critical properties from a position-space renormalization group",
    Berker, A. N.; Wortis, Michael; Physical Review B, (1976) Vol.14, No.11, 4946-4963 DOI: 10.1103/PhysRevB.14.4946
  • "Critical interactions for the triangular spin-s Ising model by a spin-restructuring transformation",
    Berker, A. Nihat; Physical Review B, (1975) Vol.12, No.7, 2752-2758 DOI: 10.1103/PhysRevB.12.2752
  • "Uniaxial and biaxial quadrupolar ordering in magnetic crystals: Molecular-field theory",
    Sivardière, Jean; Berker, A. N.; Wortis, Michael; Physical Review B, (1973) Vol.7, No.1, 343-351 DOI: 10.1103/PhysRevB.7.343

Courses Offered

Course Name Course Code Period
Engineering Mathematics II FENS102 2024/25 Spring
Physics II FENS112 2024/25 Spring
Fantasy, Reality, Science, Society, and Law GE200 2024/25 Spring
Universal Poetry in Wide Time and Wide Geography KHAS1468 2024/25 Spring
Fantasy, Reality, Science, Society, and Law GE200 2024/25 Fall
Phase Transitions and Renormalization Group PH322 2024/25 Fall
Engineering Mathematics I FENS101 2024/25 Fall
Phase Transitions and Renormalization Group CSE519 2024/25 Fall
Physics I FENS111 2024/25 Fall