Spin transfer and coherence in coupled quantum wells

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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.
13 pages, 4 figures

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Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/24285

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0406668
 http://arxiv.org/abs/cond-mat/0406668
 Phys. Rev. B 70, 121305(R) (2004)
 doi:10.1103/PhysRevB.70.121305

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arXiv