R. Nourafkan

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We investigate the physical properties of the Ba(1-x)K(x)BiO(3) compounds with a focus on the optical properties. Results from the simple Holstein model, describing a single band coupled to an oxygen breathing mode with parameters derived from first principles calculations, are in excellent agreement with a broad range of experimental information. It(More)
We derive a formula for the electric polarization of interacting insulators, expressed in terms of the full Green’s and vertex functions. We exemplify this method in the half-filled ionic Hubbard model treated within dynamical mean field theory (DMFT). The electric polarization of a correlated band insulator is determined by the interplay of ionicity and(More)
R. Nourafkan,1,2 G. Kotliar,1 and A.-M. S. Tremblay2,3 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA 2Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada (Received 11 April 2014; revised manuscript(More)
R. Nourafkan,1 G. Kotliar,2 and A.-M. S. Tremblay1,3 1Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1 2Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada (Received 13 September 2014; revised manuscript(More)
The rich variety of iron-based superconductors and their complex electronic structure lead to a wide range of possibilities for gap symmetry and pairing components. Here we solve in the two-Fe Brillouin zone the full frequency-dependent linearized Eliashberg equations to investigate spin-fluctuations mediated Cooper pairing for LiFeAs. The magnetic(More)
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