Monday, June 24, 2013

1306.5223 (Xiong-Jun Liu et al.)

Detecting Topological Orders in Cold Atoms    [PDF]

Xiong-Jun Liu, K. T. Law, T. K. Ng, Patrick A. Lee
Chern insulators are band insulators which exhibit a gap in the bulk and gapless excitations in the edge. Detection of Chern insulators is a serious challenge in cold atoms since transport measurements are technically unrealistic for neutral atoms. By establishing a natural correspondence between the time-reversal invariant topological insulator and quantum anomalous Hall system, we show for a class of Chern insulators that the topology can be determined by only measuring Bloch eigenstates at highly symmetric points of the Brillouin zone (BZ). Furthermore, we introduce two experimental schemes including the spin-resolved Bloch oscillation to carry out the measurement. These schemes are highly feasible under realistic experimental conditions. Our results provide a powerful tool to detect topological orders in cold atoms.
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