Study of electron spin diffusion transport in intrinsic GaAs quantum wells by time- and space-resolved absorbtion spectroscopy | Zendy

Yu Hua-Liang | Zendy; Xiumin Zhang | Zendy; Teng Li-Hua | Zendy; Wen Jin-Hui | Zendy; Lin Wei-Zhu | Zendy; Lai Tian-Shu | Zendy

Open Access

Study of electron spin diffusion transport in intrinsic GaAs quantum wells by time- and space-resolved absorbtion spectroscopy

Author(s) -

Yu Hua-Liang,

Xiumin Zhang,

Teng Li-Hua,

Wen Jin-Hui,

Lin Wei-Zhu,

Lai Tian-Shu

Publication year - 2009

Publication title -

acta physica sinica

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.

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