Direct observation of optically injected spin-polarized currents in semiconductors.
Quantum interference of one- and two-photon excitation of unbiased semiconductors yields ballistic currents of carriers. The magnitudes and directions of the currents and the spin orientations of the carriers are controlled by the polarization and relative phase of the exciting femtosecond laser fields. We provide direct experimental evidence for the spin polarization of the optically injected spin currents by detecting a phase-dependent spatial shift of the circularly polarized photoluminescence in cubic ZnSe.
Hübner
J
J
Department of Physics and Materials Science Center, University of Marburg, Renthof 5, 35032 Marburg, Germany.
Rühle
W W
WW
Klude
M
M
Hommel
D
D
Bhat
R D R
RD
Sipe
J E
JE
van Driel
H M
HM