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】
Free