We investigate the role of short-ranged electron-electron interactions in a paradigmatic model of three-dimensional topological insulators, using dynamical mean-field theory and focusing on nonmagnetically ordered solutions. The noninteracting band structure is controlled by a mass term M, whose value discriminates between three different insulating phases, a trivial band insulator and two distinct topologically nontrivial phases. We characterize the evolution of the transitions between the different phases as a function of the local Coulomb repulsion U and find a remarkable dependence of the U-M phase diagram on the value of the local Hund's exchange coupling J. However, regardless of the value of J, following the evolution of the topological transition line between a trivial band insulator and a topological insulator, we find a critical value of U separating a continuous transition from a first-order one. When the Hund's coupling is significant, a Mott insulator is stabilized at large U. In proximity of the Mott transition we observe the emergence of an anomalous "Mott-like" strong topological insulator state. © 2016 American Physical Society.

Strong correlation effects on topological quantum phase transitions in three dimensions / Amaricci, Adriano; Budich, J. C.; Capone, Massimo; Trauzettel, B.; Sangiovanni, G.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9969. - 93:23(2016), pp. 1-11. [10.1103/PhysRevB.93.235112]

Strong correlation effects on topological quantum phase transitions in three dimensions

Amaricci, Adriano;Capone, Massimo;
2016-01-01

Abstract

We investigate the role of short-ranged electron-electron interactions in a paradigmatic model of three-dimensional topological insulators, using dynamical mean-field theory and focusing on nonmagnetically ordered solutions. The noninteracting band structure is controlled by a mass term M, whose value discriminates between three different insulating phases, a trivial band insulator and two distinct topologically nontrivial phases. We characterize the evolution of the transitions between the different phases as a function of the local Coulomb repulsion U and find a remarkable dependence of the U-M phase diagram on the value of the local Hund's exchange coupling J. However, regardless of the value of J, following the evolution of the topological transition line between a trivial band insulator and a topological insulator, we find a critical value of U separating a continuous transition from a first-order one. When the Hund's coupling is significant, a Mott insulator is stabilized at large U. In proximity of the Mott transition we observe the emergence of an anomalous "Mott-like" strong topological insulator state. © 2016 American Physical Society.
2016
93
23
1
11
235112
https://arxiv.org/abs/1603.04263
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.235112
Amaricci, Adriano; Budich, J. C.; Capone, Massimo; Trauzettel, B.; Sangiovanni, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/14806
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