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Diffusive Spin Transport in Narrow Two-Dimensional-Electron-gas Channels

Eberle, F. ; Schuh, D. ; Bougeard, D. ; Weiss, D. ; Ciorga, M.


Using the geometry of the spin field-effect transistor, we investigate the spin transport of in-plane spins in an array of narrow channels formed in a two-dimensional electron gas confined in an (In, Ga)As quantum well. We demonstrate a clear enhancement of the spin-diffusion length with decreasing channel width, yielding up to 10 mu m for the narrowest channels. We discuss the observed ...


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