Anisotropic magnetoresistance in a Rashba two-dimensional electron system: The role of nonmagnetic long-range scattering and nonparabolic energy band
School of Physics and Electrical Engineering, Anyang Normal University - Anyang 455000, China
Accepted: 18 December 2010
The effect of nonmagnetic electron-impurity scattering on anisotropic magnetoresistance is studied in a homogeneous two-dimensional system with a Rashba spin-orbit interaction and an in-plane magnetization. We show that anisotropic magnetoresistance exists for long-range nonmagnetic electron-impurity scattering or nonparabolic energy dispersion even when both the two spin branches are occupied. For the long-range collision, the ratio between the highest-order term and the lowest-order term of the scattering potential influences both the magnitude and sign of anisotropic magnetoresistance. For the electron system with isotropic nonparabolic energy spectrum, the value of anisotropic magnetoresistance first ascends and then descends with increasing the degree of nonparabolicity.
PACS: 73.43.Qt – Magnetoresistance / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 72.20.Dp – General theory, scattering mechanisms
© EPLA, 2011