Spin transfer and coherence in coupled quantum wells

Details Spin transfer and coherence in coupled quantum wells Spin transfer and coherence in coupled quantum wells

2004-06-27

arxiv.org/abs/cond-mat/0406668v1

Phys. Rev. B 70, 121305(R) (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.121305

Spin dynamics of optically excited electrons confined in asymmetric coupled quantum wells are investigated through time resolved Faraday rotation experiments. The inter-well 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 inter-well tunneling time, the electron spin lifetime, and the Larmor precession period appear to govern this behavior.

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