Spin control in semiconductors: Variations on a theme

Nitin Samarth, David Awschalom

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The manipulation of electron spins in semiconductors is a core concept in semiconductor spintronics. We review recent experiments that show how optical, electrical and exchange fields allow the control of spin-dependent phenomena in semiconductor devices. The first example addresses the all-electrical generation of electron spin polarization in conventional semiconductors via the spin-orbit interaction. Our experiments show that current-induced spin polarization and the spin Hall effect can be observed even in wide band gap semiconductors such as ZnSe, despite a relatively weak spin-orbit coupling parameter. The next example shows how circularly polarized photons allow us to both pump and probe spin polarized states in semiconductor microcavity lasers, resulting in the surprising finding that the spin dephasing time is correlated with the Q-factor of the cavity and the onset of stimulated emission. Finally, we discuss how we exploit the exchange interaction between local moments and band electrons to manipulate electronic and local moment spin dynamics in magnetic semiconductor quantum structures.

Original languageEnglish (US)
Title of host publicationProceedings of the 14th International Workshop on the Physics of Semiconductor Devices, IWPSD
Pages8-10
Number of pages3
DOIs
StatePublished - Dec 1 2007
Event14th International Workshop on the Physics of Semiconductor Devices, IWPSD - Mumbai, India
Duration: Dec 16 2007Dec 20 2007

Publication series

NameProceedings of the 14th International Workshop on the Physics of Semiconductor Devices, IWPSD

Other

Other14th International Workshop on the Physics of Semiconductor Devices, IWPSD
CountryIndia
CityMumbai
Period12/16/0712/20/07

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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