Spin transfer and coherence in coupled quantum wells

2004/06/27 by Martino Poggio, M. Poggio, G. M. Steeves +6 · 1 citation
Engineering · Physics and Astronomy · #Magneto-Optical Properties and Applications #Quantum and electron transport phenomena #Quantum optics and atomic interactions #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.70.121305

published as Phys. Rev. B 70, 121305(R) (2004) · 13 pages, 4 figures

arxiv created 2004/06/27 · openalex publication_date 2004/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

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