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

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...

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Bibliographic Details
Published inarXiv.org
Main Authors Hernandez, F G G, Ullah, S, Ferreira, G J, Kawahala, N M, Gusev, G M, Bakarov, A K
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 14.07.2016
Subjects
Electric fields
Electron gas
Electron spin
Electrons
Induced polarization
Material properties
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Quantum wells
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1605.06854