Time-reversal-invariant Hofstadter-Hubbard Model with ultracold fermions

Cocks, Daniel, Orth, Peter P., Rachel, Stephan, Buchhold, Michael, Le Hur, Karyn, and Hofstetter, Walter (2012) Time-reversal-invariant Hofstadter-Hubbard Model with ultracold fermions. Physical Review Letters , 109. 205303. pp. 1-5.

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We consider the time-reversal-invariant Hofstadter-Hubbard model which can be realized in cold-atom experiments. In these experiments, an additional staggered potential and an artificial Rashba–type spin-orbit coupling are available. Without interactions, the system exhibits various phases such as topological and normal insulator, metal as well as semi–metal phases with two or even more Dirac cones. Using a combination of real-space dynamical mean-field theory and analytical techniques, we discuss the effect of on-site interactions and determine the corresponding phase diagram. In particular, we investigate the semi–metal to antiferromagnetic insulator transition and the stability of different topological insulator phases in the presence of strong interactions. We compute spectral functions which allow us to study the edge states of the strongly correlated topological phases.

Item ID: 34729
Item Type: Article (Research - C1)
ISSN: 1079-7114
Funders: German Research Foundation (DFG), National Science Foundation (NSF), German Excellence Initiative
Projects and Grants: DFG Grant No. RA 1949/1-1, DFG Sonderforschungsbereich SFB-TR/49, DFG Forschergruppe FOR 801, NSF DMR-0803200, NSF Grant No. 1066293
Date Deposited: 24 Sep 2014 04:34
FoR Codes: 02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020499 Condensed Matter Physics not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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