Ballistic spin transport in a two-dimensional electron gas

H. Tang, F. Monzon, Ron Lifshitz, M. Cross, M. Roukes

Research output: Contribution to journalArticlepeer-review


We explore electrically injected, spin-polarized transport in a ballistic two-dimensional electron gas. We augment the Büttiker-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 effects originate from spin precession of ballistic carriers; they exhibit a strong dependence upon device geometry, and vanish in the diffusive limit. Our results have important implications for prospective “spin transistor” devices.

Original languageEnglish
Pages (from-to)4437-4440
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number7
StatePublished - 2000
Externally publishedYes


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