Open AccessStudy of electron spin diffusion transport in intrinsic GaAs quantum wells by time- and space-resolved absorbtion spectroscopy
Author(s) -
Yu Hou,
Zhang Xiu-Min,
Teng Li-Hua,
Jin Wen,
Lin Wang,
Tianshu Lai
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.3543
Subject(s) - ambipolar diffusion , condensed matter physics , quantum well , electron , diffusion , spin (aerodynamics) , spin diffusion , spectroscopy , physics , materials science , atomic physics , molecular physics , optics , quantum mechanics , laser , thermodynamics
A time- and space-resolved circularly polarized pump-probe spectroscopy and its theory are developed, and are used experimentally to study electron spin diffusion transport in intrinsic GaAs quantum wells. The ambipolar spin diffusion coefficient of as=37.5±15 cm2/s is obtained at room temperature, and is smaller than that in a doped GaAs quantum well obtained by spin grating. The difference is explained based on “hole Coulomb drag" effect which slows the diffusion transport of electron spin packet.