## Prof. Gabriel KotliarDepartment of Physics and Astronomy, Rutgers, The State University of New Jersey. |

# Brief Biography

Dr Gabriel Kotliar holds a Board of Governors Professor Chair in the Physics Department at Rutgers University. He is well known for his contributions to the theory of strongly correlated and disordered electron systems. He was an Alfred P. Sloan Research Fellow in 1986-1988, received a Presidential Young Investigator Award in 1987, a Lady Davies Fellowship in 1994, a Guggenheim fellowship in 2003, the Blaise Pascal Chair in 2005 and the Agilent Technologies Europhysics Prize in 2006. He has been a visiting professor at the Ecole Normale and the Ecole Polytechnique in Paris and the Hebrew University in Jerusalem. Dr. Kotliar has been organized and served in the the advisory board for numerous conferences and meetings. He is a Fellow of the American Physical Society since 2001 and has coauthored over two hundred publications in refereed Journals. His current research interests include the theory of the Mott transition, superconductivity in strongly correlated electron systems, the electronic structure of transition metal oxides, lanthanides and actinides, and the development of first principles approaches for predicting physical properties of materials.

# Research Interest

Our research efforts have two aspects. One the development of novel methodologies and their application of challenging new materials and phenomena. Our research spans the areas of many body physics, statistical mechanics, computational physics and materials science.

As of 2011 I had 51 publications with more than 51 citations ( h index 51). We describe a few of them briefly below to give a flavor of the research going on in our group.

One mainstay of my research program has been the development of methods for treating strongly correlated electron systems. We favor a combination of simpler approaches such as the slave boson methodology in conjunction with more accurate methods such as the Dynamical Mean Field Theory
(DMFT) methodology for the treatment of model Hamiltonians.

1] Dynamical Mean Field Theory of Strongly Correlation Fermion Systems and the Limit of Infinite Dimensions: A. Georges, G. Kotliar, W. Krauth, and M. Rozenberg, Rev. of Mod. Phys. 68, 13-125 (1996). Cited 2197 times.

2] Hubbard Model in Infinite Dimensions: A. Georges and G. Kotliar, Phys. Rev. B 45, 6479 (1992). Cited 428 times.

3] A New Functional Integral Approach to Strongly Correlated Fermi Systems: The Gutzwiller Approximation as a Saddle Point: G. Kotliar and A. Ruckenstein. Cited 685 times.

Slave Boson Mean Field Theory Studies of t-J Models. Suggestion of a Spin Liquid Phase with a Dirac Spectrum. Very Early Suggestion that the Phase Diagram Of High Temperature Superconductors Have a d-Wave Superconducting Phase, a Pseudogap Phase and a Coherence Incoherence Crossover at Large Doping.

4] Resonating Valence Bonds and D Wave Superconductivity: G. Kotliar, Phys. Rev. B 37, 3664 (1988). Cited 428 times.

5] The Superexchange Mechanism and D Wave Superconductivity: G. Kotliar and J. Liu, Phys. Rev. B 38, 5142 (1988). Cited 383 times.
Development of an ab-initio methodology to describe the electronic structure of strongly correlated electron materials based on Dynamical Mean Field Theory and Density Functional Theory.

6]Electronic structure calculations with dynamical mean-field theory: G. Kotliar, S. Savrasov, K. Haule, V. Oudovenko, O. Parcollet, and C. Marianetti, Rev. of Mod. Phys. 78, 000865 (2006). Cited 294 times.

7] First-

principles Calculations of the Electronic Structure and Spectra of Strongly Correlated Systems: Dynamical Mean-field Theory: V. Anisimov, A. Poteryaev, M. Korotin, A. Anokhin, and G. Kotliar, J. Phys. Cond. Mat. 9, 7359-7367 (1997). Cited 208 times.
Introduction of a new perspective on the electronic structure of plutonium which lead to the theoretical prediction of its phonon spectrum.

8] Electronic correlations in metallic Plutonium within dynamical mean-field picture: S. Savrasov, G. Kotliar, and E. Abrahams, Nature 410, 793 (2001). Cited 283 times.

9] Calculated Phonon Spectra of Plutonium at High Temperatures: X. Dai, S. Y. Savrasov, G. Kotliar, A. Migliori, H. Ledbetter, and E. Abrahams, Science Mag. 300, 953-955 (2003). Cited 135 times.
Development of the theory of the temperature driven finite temperature Mott transition. Elucidation of the evolution of the quasiparticle and Hubbard bands as a function of correlation strength. Generic phase diagram describing the gradual evolution of the bad metal into a bad semiconductor at high temperature, as well as the interplay of a first order phase transition between the Mott insulating state and a Fermi liquid state at low temperatures with a large quasiparticle

10] Mott transition in the d = infinite Hubbard Model at zero temperature: X. Y. Zhang, M. Rozenberg, and G. Kotliar, Phys. Rev. Lett. 70, 1666 (1993). Cited 213 times.

11] Optical Conductivity in Mott Hubbard Systems: M. Rozenberg, G. Kotliar, H. Kajuter, G. A. Thomas, D. H. Rapkine, J. M. Honig, and P. Metcalf, Phys. Rev. Lett. 75, 105-108 (1995). Cited 138 times.
Proposal of an extension of Dynamical Mean Field Theory based on clusters, to capture short range correlations in correlated materials.

12] Cellular Dynamical Mean Field Approach to Strongly Correlated Systems: G. Kotliar, S. Y. Savrasov, G. Palsson, and G. Biroli, Phys. Rev. Lett. 87, 186401 (2001). Cited 193 times.

I have also been interested over the years in the new physics introduced by the presence of disorder in electronic and magnetic materials. In my Ph.D thesis I introduced a new model of spin glasses. I have been interested in the extensions of Fermi liquid theory to disordered systems, and of the departures from Fermi liquid behavior introduced by rare events as well as the interplay of disorder and superconductivity.

13] Fermi-Liquid Theory of Interacting Disordered systems and the Scaling Theory of the Metal Insulator Transition: C. Castellani, G. Kotliar, and P. A. Lee, Phys. Rev. Lett. 59, 323 (1987). Cited 130 times.

14] Temperature dependant transport of correlated disordered electrons: elastic vs. inelastic scattering: M. C. O. Aguiar, E. Miranda, V. Dobrosavljevic, E. Abrahams, and G. Kotliar, Europhys. Lett., 67, 226-232 (2004). Cited 163 times.

15] One-Dimensional Spin Glass Model with Long Range Random Interactions: G. Kotliar, P. W. Anderson, and D. L. Stein, Phys. Rev. B 27, 602 (1983). Spin Glasses. Cited 65 times.

16] Anderson Localization and the Theory of Dirty Superconductors: A. Kapitulnik and G. Kotliar, Phys. Rev. Lett. 54, 473(1985). Cited 59 times.

In my postdoctoral work I worked on systems far from equilibrium, to understand the laws that govern their evolution. We discovered a new principle selecting the steady states of dendrites.

17] Pattern Selection in Dendritic Solidification: E. Ben Jacob, N. Goldenfeld, G. Kotliar, and J. S. Langer, Phys. Rev. Lett. 53, 2110 (1984). Cited 119 times.
My most recent interests is the theory of the electronic structure of the recently discovered iron pnictide and chalcogenide based high temperature superconductors, which in our view represent a new class of strongly correlated electron systems.

18] Correlated electronic structure of LaOFeAs: K. Haule, J. H. Shim, G. Kotliar, Phys. Rev. Lett. 100, 226402 (2008). Cited 229 times.

# Laboratory of Theoretical Spectroscopy for Complex Correlated Materials

Prof. Gabriel Kotliar and Prof. Kristjan Haule, lead the research group for Theoretical Spectroscopy for Complex Correlated Materials at the Physics department at Rutgers.

The focus of this group is on one of the research frontiers of the twenty first century in condensed matter science: the theory of strongly correlated complex solids. Those are materials which contain open shells of d or f electron atoms and for which the standard model of solid state physics fails qualitatively. Strong correlations in solids drive a wealth of new and unusual physical properties, such as complex charge spin and orbital ordering, high temperature superconductivity, ultrafast nonlinear optical responses, large thermoelectric coefficients, huge volume collapses, and numerous metal-to-insulator transitions.

**Location:** 136 Frelinghuysen Road, Serin Lab,Piscataway, NJ 08854

# Contact information

Department of Physics and Astronomy,

Rutgers, The State University of New Jersey,

PO Box 849

Piscataway, NJ 08854-8019 USA

Phone: (732) 445-5500 x4331

Fax: (732) 445-5500

Alt Fax: (732) 445-5500 x4343

email: kotliar@physics.rutgers.edu