Spin Injection in a Ballistic Two-Dimensional Electron Gas

Details Spin Injection in a Ballistic Two-Dimensional Electron Gas Spin Injection in a Ballistic Two-Dimensional Electron Gas

1999-07-28

arxiv.org/abs/cond-mat/9907451v1

Phys. Rev. B 61 (2000) 4437-4440.

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.61.4437

We explore electrically injected, spin polarized transport in a ballistic two-dimensional electron gas. We augment the Buettiker-Landauer picture with a simple, but realistic model for spin-selective contacts to describe multimode reservoir-to-reservoir transport of ballistic spin 1/2 particles. Clear and unambiguous signatures of spin transport are established in this regime, for the simplest measurement configuration that demonstrates them directly. These new effects originate from spin precession of ballistic carriers; they exhibit strong dependence upon device geometry and vanish in the diffusive limit. Our results have important implications for prospective ``spin transistor'' devices.

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