Theory of optical spin orientation in silicon

Details Theory of optical spin orientation in silicon Theory of optical spin orientation in silicon

2010-11-10

arxiv.org/abs/1011.2259v2

Phys. Rev. B 83, 165211 (2011)

Physics

Condensed Matter

Materials Science

16 pages, 19 figures. This is an extended and comprehensive version

Scientific paper

10.1103/PhysRevB.83.165211

We theoretically investigate the indirect optical injection of carriers and spins in bulk silicon, using an empirical pseudopotential description of electron states and an adiabatic bond charge model for phonon states. We identify the selection rules, the contribution to the carrier and spin injection in each conduction band valley from each phonon branch and each valence band, and the temperature dependence of these processes. The transition from the heavy hole band to the lowest conduction band dominates the injection due to the large joint density of states. For incident light propagating along the $[00\bar{1}]$ direction, the injection rates and the degree of spin polarization of injected electrons show strong valley anisotropy. The maximum degree of spin polarization is at the injection edge with values 25% at low temperature and 15% at high temperature.

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