Kerr detection of acoustic spin transport in GaAs (110) quantum wells

Time-resolved Kerr reflectometry (TRKR) is used to investigate the long-range transport of spins by surface acoustic waves in undoped GaAs (110) quantum wells. TRKR measurements under an applied magnetic field demonstrate the coherent precession of the optically generated electron spin during acoustic transport over several micrometers and yield information about the relaxation processes for moving spins. (C) 2010 American Institute of Physics. [doi:10.1063/1.3524218] [110]