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HL: Fachverband Halbleiterphysik

HL 30: Si/Ge

HL 30.11: Talk

Wednesday, March 25, 2009, 12:15–12:30, POT 51

Optical spin injection and two-color interference effects in Ge — •Julien Rioux^1,2 and John E. Sipe¹ — ¹Department of Physics and Institute for Optical Sciences, University of Toronto, Canada — ²Department of Physics, University of Konstanz, Germany

We discuss spin population and currents in bulk germanium injected by one- and two-photon absorption. For monochromatic circularly-polarized light, we calculate the spectral dependence of the spin polarization of photoexcited carriers. In the case of two-color irradiation, currents are generated and coherently controlled by interference of one- and two-photon transitions. In particular, we look at the contribution of the holes to these all-optical effects. Calculations are performed with a full-zone k·p band structure.