title: Magnetoelectric photocurrent generated by direct interband transitions in InGaAs/InAlAs two-dimensional electron gas.
abstract: We report the observation of magnetoelectric photocurrent generated via direct interband transitions in an InGaAs/InAlAs two-dimensional electron gas by a linearly polarized incident light. The electric current is proportional to the in-plane magnetic field, which unbalances the velocities of the photoexcited carriers with opposite spins and consequently generates the electric current from a hidden spin photocurrent. The spin photocurrent can be evaluated from the measured electric current, and the conversion coefficient of spin photocurrent to electric current is self-consistently estimated to be 10(-3)-10(-2) per Tesla. The observed light-polarization dependence of the electric current is well explained by a theoretical model which reveals the wave vector angle dependence of the photoexcited carrier density.
authors.affiliation: Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Dai
authors.forename: Hai-Zhou
authors.initials: HZ
authors.lastname: Lu
authors.forename: C L
authors.initials: CL
authors.lastname: Yang
authors.forename: Shun-Qing
authors.initials: SQ
authors.lastname: Shen
authors.forename: Fu-Chun
authors.initials: FC
authors.lastname: Zhang
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Cui