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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todo:paper_10980121_v84_n23_p_Winograd2023-10-03T16:06:19Z Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices Winograd, E.A. Chitra, R. Rozenberg, M.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v84_n23_p_Winograd |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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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. |
| format |
JOUR |
| author |
Winograd, E.A. Chitra, R. Rozenberg, M.J. |
| spellingShingle |
Winograd, E.A. Chitra, R. Rozenberg, M.J. Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices |
| author_facet |
Winograd, E.A. Chitra, R. Rozenberg, M.J. |
| author_sort |
Winograd, E.A. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_10980121_v84_n23_p_Winograd |
| work_keys_str_mv |
AT winogradea orbitalselectivecrossoverandmotttransitionsinanasymmetrichubbardmodelofcoldatomsinopticallattices AT chitrar orbitalselectivecrossoverandmotttransitionsinanasymmetrichubbardmodelofcoldatomsinopticallattices AT rozenbergmj orbitalselectivecrossoverandmotttransitionsinanasymmetrichubbardmodelofcoldatomsinopticallattices |
| _version_ |
1807323839045042176 |