Controlling the spin orientation of photoexcited electrons by symmetry breaking

Details Controlling the spin orientation of photoexcited electrons by symmetry breaking Controlling the spin orientation of photoexcited electrons by symmetry breaking

2010-05-07

arxiv.org/abs/1005.1280v3

Phys. Rev. Lett. 107, 107202 (2011)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, resubmitted

Scientific paper

10.1103/PhysRevLett.107.107202

We study reflection of optically spin-oriented hot electrons as a means to probe the semiconductor crystal symmetry and its intimate relation with the spin-orbit coupling. The symmetry breaking by reflection manifests itself by tipping the net-spin vector of the photoexcited electrons out of the light propagation direction. The tipping angle and the pointing direction of the net-spin vector are set by the crystal-induced spin precession, momentum alignment and spin-momentum correlation of the initial photoexcited electron population. We examine non-magnetic semiconductor heterostructures and semiconductor/ferromagnet systems and show the unique signatures of these effects.

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