Composite fermion state of spin-orbit coupled bosons

2012/08/30 by Tigran A. Sedrakyan, Alex Kamenev, Leonid I. Glazman · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.str-el

paper · pdf · doi:10.1103/physreva.86.063639

published as Phys. Rev. A 86, 063639 (2012) · 15 pages, 7 figures, Revtex

arxiv created 2012/08/30 · arxiv updated 2013/01/07

Abstract

We consider spinor Bose gas with the isotropic Rashba spin-orbit coupling in 2D. We argue that at low density its groundstate is a composite fermion state with a Chern-Simons gauge field and filling factor one. The chemical potential of such a state scales with the density as μ∝ n^3/2. This is a lower energy per particle than μ∝ n for the earlier suggested groundstate candidates: a condensate with broken time-reversal symmetry and a spin density wave state.

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