Spin excitation spectra of spin–orbit coupled bosons in an optical lattice

doi:10.1088/1674-1056/24/5/056701

Abstract

Spin-wave excitation plays important roles in the investigation of the magnetic phases. In this paper, we study the spin-wave excitation spectra of two-component Bose gases with spin–orbit coupling in a deep square optical lattice using the spin-wave theory. We find that, while the excitation spectrum of the vortex crystal phase is gapless with a linear dispersion in the vicinity of the minimum point, the spectra of the commensurate spiral spin phase and the skyrmion crystal phase are gapped. Significantly, the spin fluctuations strongly destabilize the classical ground state of the skyrmion phase with the appearance of an imaginary part in the eigenfrequencies of spin excitations. Such features of the spin excitation spectra provide further insights into the exotic spin phases.

Keywords: ultracold Fermi gas optical lattice spin– orbit coupling spin excitation spectrum

Received: 08 November 2014
Revised: 26 December 2014
Accepted manuscript online:

PACS:	67.85.-d	(Ultracold gases, trapped gases)
	37.10.Jk	(Atoms in optical lattices)
	71.10.Fd	(Lattice fermion models (Hubbard model, etc.))

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11347197, 11404225, and 11474205).

Corresponding Authors: Sun Qing, Ji An-Chun
E-mail: sunqing@cnu.edu.cn;andrewjee@sina.com

About author: 67.85.-d; 37.10.Jk; 71.10.Fd

Cite this article:

Li Ruo-Yan (李若言), He Liang (贺亮), Sun Qing (孙青), Ji An-Chun (纪安春), Tian Guang-Shan (田光善) Spin excitation spectra of spin–orbit coupled bosons in an optical lattice 2015 Chin. Phys. B 24 056701

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Spin excitation spectra of spin–orbit coupled bosons in an optical lattice

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