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Chin. Phys. B, 2015, Vol. 24(5): 056701    DOI: 10.1088/1674-1056/24/5/056701
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Li Ruo-Yan (李若言)a, He Liang (贺亮)b, Sun Qing (孙青)c, Ji An-Chun (纪安春)c, Tian Guang-Shan (田光善)a
a School of Physics, Peking University, Beijing 100048, China;
b Institut für Theoretische Physik, Leopold-Franzens Universität Innsbruck, A-6020 Innsbruck, Austria;
c Department of Physics, Capital Normal University, Beijing 100048, China
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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