Composite fermion state of spin-orbit coupled bosons

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\propto n^{3/2}. This is a lower energy per particle than μ\propto n for the earlier suggested groundstate candidates: a condensate with broken time-reversal symmetry and a spin density wave state.

15 pages, 7 figures, Revtex

References in corpus (11)

• Single-Spin Addressing in an Atomic Mott Insulator
• Spin-Orbit Coupled Spinor Bose-Einstein Condensates
• A Bose-Einstein Condensate in a Uniform Light-induced Vector Potential
• Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark states
• Spin-orbit coupled Bose-Einstein condensates
• Spin Hall effects for cold atoms in a light induced gauge potential
• Bose condensation in flat bands
• Experimental demonstration of single-site addressability in a two-dimensional optical lattice
• Generalized Rashba spin-orbit coupling for cold atoms
• Non-equilibrium spin dynamics in a trapped Fermi gas with effective spin-orbit interaction
• Stability of ultracold atomic Bose condensates with Rashba spin-orbit coupling against quantum and thermal fluctuations