Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

Article

关键词: GALLIUM-ARSENIDE;    QUANTUM-WELL;    POLARIZATION;    ORIENTATION;    TRANSPORT;    HALL;    SINGLE;    GAAS;   

DOI  :  10.1103/PhysRevB.94.045305

来源: SCIE

【 摘 要 】

We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the optical resonant amplification of the electrically-induced polarization, revealed a large spatial variation of the electron g factor and the efficient generation of a current-controlled spin-orbit field in a macroscopic Hall bar device. We observed coherence times in the nanoseconds range transported beyond half-millimeter distances in a direction transverse to the applied electric field. The measured long spin transport length can be explained by two material properties: large mean free path for charge diffusion in clean systems and enhanced spin-orbit coefficients in the triple well.

【 授权许可】

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