Time-reversal-invariant hofstadter-hubbard model with ultracold fermions

Daniel Cocks, Peter P. Orth, Stephan Rachel, Michael Buchhold, Karyn Le Hur, Walter Hofstetter

Research output: Contribution to journalArticlepeer-review

84 Scopus citations


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.

Original languageEnglish (US)
Article number205303
JournalPhysical review letters
Issue number20
StatePublished - Nov 13 2012

Fingerprint Dive into the research topics of 'Time-reversal-invariant hofstadter-hubbard model with ultracold fermions'. Together they form a unique fingerprint.

Cite this