Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices

We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature,...

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Autor principal: Rozenberg, Marcelo Javier
Publicado: 2011
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v84_n23_p_Winograd
http://hdl.handle.net/20.500.12110/paper_10980121_v84_n23_p_Winograd
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_10980121_v84_n23_p_Winograd2023-06-08T16:07:50Z Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices Rozenberg, Marcelo Javier We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society. Fil:Rozenberg, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v84_n23_p_Winograd http://hdl.handle.net/20.500.12110/paper_10980121_v84_n23_p_Winograd
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.
author Rozenberg, Marcelo Javier
spellingShingle Rozenberg, Marcelo Javier
Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
author_facet Rozenberg, Marcelo Javier
author_sort Rozenberg, Marcelo Javier
title Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_short Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_full Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_fullStr Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_full_unstemmed Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_sort orbital-selective crossover and mott transitions in an asymmetric hubbard model of cold atoms in optical lattices
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v84_n23_p_Winograd
http://hdl.handle.net/20.500.12110/paper_10980121_v84_n23_p_Winograd
work_keys_str_mv AT rozenbergmarcelojavier orbitalselectivecrossoverandmotttransitionsinanasymmetrichubbardmodelofcoldatomsinopticallattices
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