随时间变化磁场中自旋演化的求解新方法  

A New Approach to Spin Evolution in Time-Dependent Magnetic Field

作　　者：杨进[1] 林能杰[1] 张德培[1] 石宇鹏[1] YANG Jin LIN Neng-iie ZHANG De-pei SHI Yu-peng(School of Optics and Electronics, Chengdu University of Information Technology, Chengdu 610225, China)

机构地区：[1]成都信息工程大学光电技术学院,成都610225

出　　处：《量子光学学报》2016年第4期303-306,共4页Journal of Quantum Optics

基　　金：四川省教育厅自然科学基金(2004A156);CUIT科学研究基金(200404)

摘　　要：采用粒子自旋角动量的两个独立谐振子实现和含时规范变换方法,得到不同空间位形的时变磁场中粒子的自旋态,并指出作旋转波近似,即忽略含时快变反共振项的物理原因。本文所用的新方法可应用于其它一些量子系统。A spin particle subjected to time-dependent magnetic field is reseached in detail at different magnetic field configurations.A spin state is obtained easily by means of realizing two independent harmonic oscillators for spin angular momentum and a gauge transformation method,and physical reason for rotationless wave approximation,i.e.ignoring time-varying anti-resonant term is clarified.The approach can also be applicable in some other quantum systems.

关 键 词：自旋粒子 Schwinger表象 含时规范变换 自旋演化 

分 类 号：O413.1[理学—理论物理]