Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling
LIU Gen-Hua1, ZHOU Guang-Hui1,2
1Department of Physics, Hunan Normal University, Changsha 410081
2International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling
LIU Gen-Hua1;ZHOU Guang-Hui1,2
1Department of Physics, Hunan Normal University, Changsha 410081
2International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Abstract： We theoretically study the low temperature electron transport properties of a weak Rashba spin-orbit coupling (SOC) semiconductor quantum wire connected nonadiabatically to two electrode leads without SOC. The wire and the leads are defined by a parabolic confining potential, and the influence of both the wire-lead connection and the Rashba SOC on the electron transport is treated analytically by means of scattering matrix within effective free-electron approximation. From analytical analysis and numerical examples, we find that the system shows some fractional quantum conductance behaviour, and for some particular wire width a pure spin polarized current exists. Our result may imply a simple method for the design of a spin filter without involving any magnetic materials or magnetic fields.
(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
引用本文:
LIU Gen-Hua;ZHOU Guang-Hui;. Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling[J]. 中国物理快报, 2005, 22(12): 3159-3162.
LIU Gen-Hua, ZHOU Guang-Hui,. Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling. Chin. Phys. Lett., 2005, 22(12): 3159-3162.
2005, Vol. 22 
