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Mott transition
About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.
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TL;DR: The combination of bandstructure theory in the local density approximation with dynamical mean-field theory was recently successfully applied to V 2 O 3 as discussed by the authors, a material which undergoes the famous Mott-Hubbard metal-insulator transition upon Cr doping.
Abstract: The combination of bandstructure theory in the local density approximation with dynamical mean-field theory was recently successfully applied to V 2 O 3 —a material which undergoes the famous Mott–Hubbard metal–insulator transition upon Cr doping The aim of this short paper is to emphasize two aspects of our recent results: (i) the filling of the Mott–Hubbard gap with increasing temperature, and (ii) the peculiarities of the Mott–Hubbard transition in this system which is not characterized by a divergence of the effective mass for the a 1 g -orbital
4 citations
TL;DR: In this article, the formation of exciton bound states between electrons and holes in a 2D layer was considered and the medium modifications of two-particle properties were obtained from a systematic Green function approach within a cluster mean field approximation.
Abstract: We consider the formation of exciton bound states between electrons and holes in a 2D layer. The medium modifications of two-particle properties are obtained from a systematic Green function approach within a cluster mean field approximation. Contributions from correlations (excitons) in the medium are given. The importance of Pauli blocking on the shift of the ionization energy of excitons in comparison to screening is shown.
4 citations
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TL;DR: In this article, the slave Boson mean field theory is generalized to the three band systems with full Hund's rule coupling including spin flip and pair hopping terms, and a new type of Mott transition which is driven by the crystal field splitting or the lattice distortion is found.
Abstract: In the present paper, we systematically studied the possible Orbital selective Mott transition (OSMT) in the $t_{2g}$ system, which has three orbital degeneracy. The slave Boson mean field theory is generalized to the three band systems with full Hund's rule coupling including spin flip and pair hopping terms. A new type of Mott transition which is driven by the crystal field splitting or the lattice distortion is found is this model. We argue that this new type of Mott transition may relate to the puzzling phase in $Sr_{x}Ca_{2-x}RuO_4$.
4 citations
TL;DR: In this paper, a theory of the metal-insulator transition, taking into account the effects of an external magnetic field is presented, and the existence of a critical field Hc such that higher magnetic fields destroy the insulating phase is derived.
Abstract: A theory of the metal-insulator transition, taking into account the effects of an external magnetic field is presented. Comparison with experimental susceptibility and optical data for VO2 is good and yields for theoretical parameters the values: Intra-atomic Coulomb integral I approximately=0.7 eV; density of states N(Ef) approximately=1023 cm-3 eV-1 ratio IN(Ef)/N approximately=10; optical energy gap Eg approximately=0.7 eV. The insulating phase stability criterion is shown to be identical with Mott's. The existence of a critical field Hc such that higher magnetic fields destroy the insulating phase is derived.
4 citations
TL;DR: The Mott transition of a mixed Bose-Fermi system of ultracold atoms in an optical lattice is studied, where the number of (spinless) fermions and bosons adds up to one atom per lattice, n(F)+n(B)=1.
Abstract: We study the Mott transition of a mixed Bose-Fermi system of ultracold atoms in an optical lattice, where the number of (spinless) fermions and bosons adds up to one atom per lattice, n(F)+n(B)=1. For weak interactions, a Fermi surface coexists with a Bose-Einstein condensate while for strong interaction the system is incompressible but still characterized by a Fermi surface of composite fermions. At the critical point, the spectral function of the fermions A(k,ω) exhibits a pseudogapped behavior, rising as |ω| at the Fermi momentum, while in the Mott phase it is fully gapped. Taking into account the interaction between the critical modes leads at very low temperatures either to p-wave pairing or the transition is driven weakly first order. The same mechanism should also be important in antiferromagnetic metals with a small Fermi surface.
4 citations