Monday, December 17, 2012

1212.3552 (Nigel R. Cooper et al.)

Reaching Fractional Quantum Hall States with Optical Flux Lattices    [PDF]

Nigel R. Cooper, Jean Dalibard
We present a robust scheme by which fractional quantum Hall states of bosons can be achieved for ultracold atomic gases. We describe a new form of optical flux lattice, suitable for commonly used atomic species with groundstate angular momentum $J_g = 1$, for which the lowest energy band is topological and nearly dispersionless. Through exact diagonalization studies, we show that, even for moderate interactions, the many-body groundstates consist of bosonic fractional quantum Hall states, including the Laughlin state and the Moore-Read (Pfaffian) state. Under realistic conditions, these phases are shown to have energy gaps that are larger than temperature scales achievable in ultracold gases.
View original: http://arxiv.org/abs/1212.3552

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