Spin transfer and coherence in coupled quantum wells

M. Poggio*, G. M. Steeves, R. C. Myers, N. P. Stern, A. C. Gossard, D. D. Awschalom

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Spin dynamics of optically excited electrons confined in asymmetric coupled quantum wells are investigated through time-resolved Faraday rotation experiments. The interwell coupling is shown to depend on applied electric field and barrier thickness. We observe three coupling regimes: independent spin precession in isolated quantum wells, incoherent spin transfer between single-well states, and coherent spin transfer in a highly coupled system. Relative values of the interwell tunneling time, the electron-spin lifetime, and the Larmor precession period appear to govern this behavior.

Original languageEnglish (US)
Article number121305
Pages (from-to)121305-1-121305-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number12
DOIs
StatePublished - Sep 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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