Abstract

We study a single-mode Datta-Das spin field-effect transistor (SFET) in the presence (absence) of impurity scattering and external magnetic fields, and find interesting mesoscopic effects such as peak splitting, phase locking, and period halving. Experimental observation of these effects appears to be feasible in a single-mode SFET made of materials such as $\mathrm{In}\mathrm{Ga}\mathrm{As}∕\mathrm{In}\mathrm{Al}\mathrm{As}$.

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