Wu Qing-Qiu, Ni Wei-Hai, You Wen-Long
College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China.
J Phys Condens Matter. 2017 Jun 7;29(22):225804. doi: 10.1088/1361-648X/aa6e6d.
We consider a class of one-dimensional compass models with staggered Dzyaloshinskii-Moriya exchange interactions in an external transverse magnetic field. Based on the exact solution derived from Jordan-Wigner approach, we study the excitation gap, energy spectra, spin correlations and critical properties at phase transitions. We explore mutual effects of the staggered Dzyaloshinskii-Moriya interaction and the magnetic field on the energy spectra and the ground-state phase diagram. Thermodynamic quantities including the entropy and the specific heat are discussed, and their universal scalings at low temperature are demonstrated.
我们考虑一类在外部横向磁场中具有交错Dzyaloshinskii-Moriya交换相互作用的一维罗盘模型。基于从Jordan-Wigner方法导出的精确解，我们研究了激发能隙、能谱、自旋关联以及相变处的临界性质。我们探讨了交错Dzyaloshinskii-Moriya相互作用和磁场对能谱及基态相图的相互影响。讨论了包括熵和比热在内的热力学量，并展示了它们在低温下的普适标度。
