Spin precession and time-reversal symmetry breaking in quantum transport of electrons through mesoscopic rings

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	Spin precession and time-reversal symmetry breaking in quantum transport of electrons through mesoscopic rings
	Qian, TZ; Yi, YS; Su, ZB; Yi, YS , CHINESE ACAD SCI,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA.
刊名	PHYSICAL REVIEW B
	1997
卷号	55 期号:16 页码:10631-10637
关键词	Aharonov-anandan Phase Berry Phase Conductance Fluctuations Persistent Currents Orbit Interaction Oscillations Scattering Systems
ISSN号	0163-1829
英文摘要	We consider the motion of electrons through a mesoscopic ring in the presence of a spin-orbit interaction, Zeeman coupling, and magnetic flux. The coupling between the spin and the orbital degrees of freedom results in the geometric and the dynamical phases associated with a:cyclic evolution of a spin state. Using a nonadiabatic Aharonov-Anandan phase approach, we obtain the exact solution of the system and identify the geometric and the dynamical phases for the energy eigenstates. Spin precession of electrons encircling the ring can lead to various interference phenomena such as oscillating persistent current and conductance. We investigate the transport properties of the ring connected to current leads to explore the roles of the time-reversal symmetry and its breaking therein with the spin degree of freedom being fully taken into account. We derive an exact expression for the transmission probability through the ring. We point out that the time-reversal symmetry breaking due to Zeeman coupling can totally invalidate the picture that spin precession results in an effective, spin-dependent Aharonov-Bohm flux for interfering electrons. We carry out numerical computation to illustrate the joint effects of the spin-orbit interaction, Zeeman coupling, and magnetic flux. By examining the resonant tunneling of electrons in the weak-coupling limit, we establish a connection between the observable time-reversal symmetry-breaking effects manifested by the persistent current and by the transmission probability. For a ring formed by a two-dimensional electron gas, we propose an experiment in which the direction of the persistent current can be determined by the flux dependence of the transmission probability. That experiment also serves to detect if the electron-electron interaction can qualitatively alter the electronic states.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:A1997WW80300067
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/12491]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Yi, YS , CHINESE ACAD SCI,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA.
推荐引用方式 GB/T 7714	Qian, TZ,Yi, YS,Su, ZB,et al. Spin precession and time-reversal symmetry breaking in quantum transport of electrons through mesoscopic rings[J]. PHYSICAL REVIEW B,1997,55(16):10631-10637.
APA	Qian, TZ,Yi, YS,Su, ZB,&Yi, YS , CHINESE ACAD SCI,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA..(1997).Spin precession and time-reversal symmetry breaking in quantum transport of electrons through mesoscopic rings.PHYSICAL REVIEW B,55(16),10631-10637.
MLA	Qian, TZ,et al."Spin precession and time-reversal symmetry breaking in quantum transport of electrons through mesoscopic rings".PHYSICAL REVIEW B 55.16(1997):10631-10637.