Quasiprobability Distribution of Squeezed Thermal Spin States in Ferromagnet

作     者：XU Qin-Feng CHENG Ze 

作者机构：Department of Physics Huazhong University of Science and Technology Wuhan 430074 China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2008年第49卷第3期

页      面：777-782页

核心收录：

学科分类：080805[工学-电工理论与新技术] 080904[工学-电磁场与微波技术] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：supported by National Natural Science Foundation of China under Grant Nos.10174024 and 10474025 

主　　题：squeezed thermal spin state ferromagnon quasiprobability distribution function 

摘      要：We study squeezed properties of magnon squeezed thermal spin states by using the distribution of Q function in the ferromagnet. It is found that the distribution of Q function strongly depends on the temperature T and coupling parameter γ. Below the transition temperature Tc, the distribution Q function in the squeezed thermal spin state presents a richer structure than in the normal state. Non-classical effects have been observed. In the transition from the normal to the squeezed thermal spin state, the phase symmetry of the magnon system is spontaneously broken.