Dresden 2003 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 27: Spinabh
ängiger Transport I

HL 27.1: Vortrag

Dienstag, 25. März 2003, 17:15–17:30, BEY/154

Non-ballistic spin field-effect transistor — •John Schliemann, J. Carlos Egues, and Daniel Loss — University of Basel, Switzerland

We propose a spin field-effect transistor based on spin-orbit coupling of both the Rashba and the Dresselhaus types. Differently from earlier proposals, spin transport through our device is tolerant against spin-independent scattering processes. Hence the requirement of strictly ballistic transport can be relaxed. This follows from a unique interplay between the Dresselhaus and the (gate-controlled) Rashba interactions; these can be tuned to have equal strengths thus yielding k-independent eigenspinors even in two dimensions. We discuss implementations with two-dimensional devices and quantum wires. In the latter, our setup presents strictly parabolic dispersions which avoids complications arising from anticrossings of different bands.

preprint: cond-mat/0211603