中国物理B ›› 2013, Vol. 22 ›› Issue (9): 90313-090313.doi: 10.1088/1674-1056/22/9/090313

• GENERAL • 上一篇    下一篇

The effects of the Dzyaloshinskii-Moriya interaction on the ground-state properties of the XY chain in a transverse field

钟鸣a, 徐卉a, 刘小贤a, 童培庆a b   

  1. a Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China;
    b Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems, Nanjing Normal University, Nanjing 210023, China
  • 收稿日期:2012-12-19 修回日期:2013-03-27 出版日期:2013-07-26 发布日期:2013-07-26
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11205090 and 11175087) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 12KJB140008).

The effects of the Dzyaloshinskii-Moriya interaction on the ground-state properties of the XY chain in a transverse field

Zhong Ming (钟鸣)a, Xu Hui (徐卉)a, Liu Xiao-Xian (刘小贤)a, Tong Pei-Qing (童培庆)a b   

  1. a Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China;
    b Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems, Nanjing Normal University, Nanjing 210023, China
  • Received:2012-12-19 Revised:2013-03-27 Online:2013-07-26 Published:2013-07-26
  • Contact: Tong Pei-Qing E-mail:pqtong@njnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11205090 and 11175087) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 12KJB140008).

摘要: The effects of the Dzyaloshinski-Moriya (DM) interaction on the ground-state properties of the anisotropic XY chain in a transverse field have been studied by means of correlation functions and entanglement. Different from the case without the DM interaction, the excitation spectra εk of this model are not symmetrical in the momentum space and are not always positive. As a result, besides the ferromagnetic (FM) and the paramagnetic (PM) phases, a gapless chiral phase is induced. In the chiral phase, the von Neumann entropy is proportional to log2L (L is the length of a subchain) with the coefficient A≈1/3, which is the same as that of the XY chain in a transverse field without the DM interaction for γ=0 and 0<h ≤1. And in the vicinity of the critical point between the chiral phase and the FM (or PM) phase, the behaviors of the nearest-neighbor concurrence and its derivative are like those for the anisotropy transition.

关键词: Dzyaloshinskii-Moriya interaction, the XY chain in a transverse field, quantum entanglement, ground-state properties

Abstract: The effects of the Dzyaloshinski-Moriya (DM) interaction on the ground-state properties of the anisotropic XY chain in a transverse field have been studied by means of correlation functions and entanglement. Different from the case without the DM interaction, the excitation spectra εk of this model are not symmetrical in the momentum space and are not always positive. As a result, besides the ferromagnetic (FM) and the paramagnetic (PM) phases, a gapless chiral phase is induced. In the chiral phase, the von Neumann entropy is proportional to log2L (L is the length of a subchain) with the coefficient A≈1/3, which is the same as that of the XY chain in a transverse field without the DM interaction for γ=0 and 0<h ≤1. And in the vicinity of the critical point between the chiral phase and the FM (or PM) phase, the behaviors of the nearest-neighbor concurrence and its derivative are like those for the anisotropy transition.

Key words: Dzyaloshinskii-Moriya interaction, the XY chain in a transverse field, quantum entanglement, ground-state properties

中图分类号:  (Entanglement measures, witnesses, and other characterizations)

  • 03.67.Mn
75.10.Jm (Quantized spin models, including quantum spin frustration) 73.43.Nq (Quantum phase transitions) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))