利用光晶格自旋链中磁振子的激发模拟有限温度下光子的动力学Casimir效应  

Simulating dnamical Casimir effect at finite temperature with magnons in spin chain within an optical lattice

作　　者：赵旭[1] 赵兴东[1,2] 景辉[2] 

机构地区：[1]华东师范大学物理系,精密光谱科学与技术国家重点实验室,上海200062 [2]河南师范大学物理与电子工程学院,新乡453007

出　　处：《物理学报》2013年第6期32-38,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2011CB921604);国家自然科学基金(批准号:11004057;10828408);上海市重点学科带头人项目(批准号:B480)资助的课题~~

摘　　要：研究了在静磁场诱导的磁偶极-偶极相互作用和外部激光场诱导产生的偶极-偶极相互作用下光晶格自旋链中磁振子激发的动力学特征.文中选取了蓝失谐光晶格,提出了等效温度的概念,并将系统中磁振子的激发过程与光学振动腔中光子的激发过程进行了类比.研究表明,通过选取适当的系统参数,可以在磁振子系统中重现有限温度下光子的动力学Casimir效应.In this paper, we study the dynamical characteristics of magnons generated by the static magnetic dipole-dipole interaction and the external-laser induced dipole-dipole interaction in spin chain within an optical lattice. Specially, we choose a blue-detuned optical lattice and define an effective temperature for the system. We make a comparison between the generation process of magnons and that of photons in an optical vibration cavity. The results show that by suitably choosing the system parameters, the dynamical Casimir effect at finite temperature in the magnon system can be reproduced.

关 键 词：光晶格 偶极-偶极相互作用 磁振子 CASIMIR效应 

分 类 号：O572.31[理学—粒子物理与原子核物理]