Publication Date

12-15-2016

Document Type

Article

Department

Physics and Astronomy

Disciplines

Atomic, Molecular and Optical Physics

Publication Title

Physical Review A

Abstract

The internal degrees of freedom provided by ultracold atoms give a route for realizing higher dimensional physics in systems with limited spatial dimensions. Non-spatial degrees of freedom in these systems are dubbed "synthetic dimensions". This connection is useful from an experimental standpoint but complicated by the fact that interactions alter the condensate ground state. Here we use the Gross-Pitaevskii equation to study ground state properties of a spin-1 Bose gas under the combined influence of an optical lattice, spin-orbit coupling, and interactions at the mean field level. The associated phases depend on the sign of the spin-dependent interaction parameter and the strength of the optical lattice potential. We find "charge" and spin density wave phases which are directly related to helical spin order in real space and affect the behavior of edge currents in the synthetic dimension. We determine the resulting phase diagram as a function of the spin-orbit coupling and spin-dependent interaction strength, considering both attractive (ferromagnetic) and repulsive (polar) spin-dependent interactions. Our results are applicable to current and future experiments, specifically with 87Rb, 7Li, 41K, and 23Na.

Keywords

Cold gases in optical lattices

Comments

This article originally appeared in Physical Review A, volume 94, issue 6, 2016, published by the American Physical Society. ©2016 American Physical Society. The article can also be found online at this link.

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