Fluctuation-driven topological Hund insulators
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
We investigate the role of electron-electron interaction in a two-band Hubbard model based on the Bernevig-Hughes-Zhang Hamiltonian exhibiting the quantum spin Hall (QSH) effect. By means of dynamical mean-field theory, we find that a system with topologically trivial noninteracting parameters can be driven into a QSH phase at finite interaction strength by virtue of local dynamical fluctuations. For very strong interaction, the system reenters a trivial insulating phase by going through a Mott transition. We obtain the phase diagram of our model by direct calculation of the bulk topological invariant of the interacting system in terms of its single-particle Green's function.
Details
Originalsprache | Englisch |
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Aufsatznummer | 235104 |
Fachzeitschrift | Physical Review B - Condensed Matter and Materials Physics |
Jahrgang | 87 |
Ausgabenummer | 23 |
Publikationsstatus | Veröffentlicht - 4 Juni 2013 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |