Artículo
On the nature of the Mott transition in multiorbital systems
Facio, Jorge Ismael
; Vildosola, Veronica Laura
; Garcia, Daniel Julio
; Cornaglia de la Cruz, Pablo Sebastian
Fecha de publicación:
02/2017
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
2469-9969
e-ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We analyze the nature of a Mott metal-insulator transition in multiorbital systems using dynamical mean-field theory. The auxiliary multiorbital quantum impurity problem is solved using continuous-time quantum Monte Carlo and the rotationally invariant slave-boson (RISB) mean-field approximation. We focus our analysis on the Kanamori Hamiltonian and find that there are two markedly different regimes determined by the nature of the lowest-energy excitations of the atomic Hamiltonian. The RISB results at T → 0 suggest the following rule of thumb for the order of the transition at zero temperature: a second-order transition is to be expected if the lowest-lying excitations of the atomic Hamiltonian are charge excitations, while the transition tends to be first order if the lowest-lying excitations are in the same charge sector as the atomic ground state. At finite temperatures, the transition is first order and its strength, as measured, e.g., by the jump in the quasiparticle weight at the transition, is stronger in the parameter regime where the RISB method predicts a first-order transition at zero temperature. Interestingly, these results seem to apply to a wide variety of models and parameter regimes.
Palabras clave:
MOTT TRANSITION
,
HUND
,
DMFT
,
RISB
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Facio, Jorge Ismael; Vildosola, Veronica Laura; Garcia, Daniel Julio; Cornaglia de la Cruz, Pablo Sebastian; On the nature of the Mott transition in multiorbital systems; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 95; 8; 2-2017; 1-10
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