Journal article
Time-reversal-invariant hofstadter-hubbard model with ultracold fermions
D Cocks, PP Orth, S Rachel, M Buchhold, K Le Hur, W Hofstetter
Physical Review Letters | AMER PHYSICAL SOC | Published : 2012
Abstract
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 differe..
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Awarded by National Science Foundation
Funding Acknowledgements
The authors acknowledge useful discussions with L. Fritz, K. Sengstock, and I. Spielman. This work was supported by the DFG under Grant No. RA 1949/1-1 (S. R.) and via Sonderforschungsbereich SFB-TR/49 and Forschergruppe FOR 801 (D. C., M. B., W. H.), by the NSF under NSF DMR 0803200 (K. L. H.), and the Young Investigator Group of P.P.O. received financial support from the "Concept for the Future" of the KIT within the framework of the German Excellence Initiative. K. L. H. and W. H. benefited from a summer conference at the Aspen Center for Physics supported by the NSF under Grant No. 1066293. D. C. and P.P.O. contributed equally to this work.