Magnetoelectric photocurrent generated by direct interband transitions in InGaAs/InAlAs two-dimensional electron gas.
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.
Dai
Junfeng
J
Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Lu
Hai-Zhou
HZ
Yang
C L
CL
Shen
Shun-Qing
SQ
Zhang
Fu-Chun
FC
Cui
Xiaodong
X