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arXiv · 1605.06854

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

F. G. G. Hernandez·S. Ullah·G. J. Ferreira·N. M. Kawahala·G. M. Gusev·A. K. Bakarov
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Abstract

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.

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F. G. G. Hernandez, S. Ullah, G. J. Ferreira, N. M. Kawahala, G. M. Gusev, A. K. Bakarov. 2016-07-14. Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases. https://doi.org/10.1103/physrevb.94.045305

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