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

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

中国物理B ›› 2015, Vol. 24 ›› Issue (5): 56701-056701.doi: 10.1088/1674-1056/24/5/056701

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

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

李若言^a, 贺亮^b, 孙青^c, 纪安春^c, 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

收稿日期:2014-11-08 修回日期:2014-12-26 出版日期:2015-05-05 发布日期:2015-05-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11347197, 11404225, and 11474205).

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

Received:2014-11-08 Revised:2014-12-26 Online:2015-05-05 Published:2015-05-05
Contact: 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
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11347197, 11404225, and 11474205).

摘要/Abstract

摘要：

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.

关键词: ultracold Fermi gas, optical lattice, spin–, orbit coupling, spin excitation spectrum

Abstract:

Key words: ultracold Fermi gas, optical lattice, spin–, orbit coupling, spin excitation spectrum

中图分类号: (Ultracold gases, trapped gases)

67.85.-d

37.10.Jk (Atoms in optical lattices) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))

李若言, 贺亮, 孙青, 纪安春, 田光善. Spin excitation spectra of spin–orbit coupled bosons in an optical lattice[J]. 中国物理B, 2015, 24(5): 56701-056701.

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[J]. Chin. Phys. B, 2015, 24(5): 56701-056701.

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

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

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