Friday, May 31, 2013

1305.6948 (Stefanos Kourtis et al.)

Combined topological and Landau order from strong correlations in Chern
bands
   [PDF]

Stefanos Kourtis, Maria Daghofer
We present a class of states with both topological and conventional Landau order that arise out of strongly interacting spinless fermions in fractionally filled and topologically non-trivial bands with Chern number $C=\pm 1$. These quantum states show the features of fractional Chern insulators, such as fractional Hall conductivity and interchange of ground-state levels upon insertion of a magnetic flux. In addition, they exhibit charge order and a related additional trivial ground-state degeneracy. Band mixing and geometric frustration of the charge pattern place these lattice states markedly beyond a single-band description.
View original: http://arxiv.org/abs/1305.6948

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