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HL: Fachverband Halbleiterphysik

HL 39: Ultra fast phenomena

HL 39.6: Vortrag

Donnerstag, 28. Februar 2008, 12:30–12:45, ER 270

Influence of heavy-hole light-hole band mixing on the strength of optically generated spin-currents in III-V semiconductor quantum wells — •Bernhard Pasenow¹, Torsten Meier², and Stephan W. Koch¹ — ¹Department of Physics and Material Sciences Center, Philipps University, Renthof 5, D-35032 Marburg, Germany — ²Department Physik, Fakultät für Naturwissenschaften, Universität Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

The coherent optical injection and temporal decay of spin and charge currents in semiconductor heterostructures has been investigated on a microscopic level including Coulomb and phononic effects up to second Born scattering contributions [1,2].
In this talk the previously used two-band effective mass approach is extended to a realistic bandstructure model using microscopic 8x8 kp matrix elements focussing on heavy-hole light-hole band-mixing effects. It will be shown how this band-mixing influences the strength of the optically generated spin-currents in different semiconductor quantum wells leading to rules for optimal structure composition [3].
[1] H.T. Duc, T. Meier, and S.W. Koch, PRL 95, 086606 (2005).
H.T. Duc, Q.T. Vu, T. Meier, H. Haug, and S.W. Koch, PRB 74, 165328 (2006)
B. Pasenow, T. Meier, and S.W. Koch, unpublished