Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 6: Ultrafast Phenoma I
HL 6.10: Vortrag
Montag, 20. März 2017, 12:30–12:45, POT 51
A combined approach of k.p-perturbation theory and semiconductor Bloch equations for the analysis of ultrafast photocurrents — •Reinold Podzimski1, Huynh Thanh Duc2, and Torsten Meier1 — 1Department Physik and Center of Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany; — 2Ho Chi Minh City Institute of Physics, Vietnam Academy of Science and Technology, Mac Dinh Chi Street 1, District 1, Ho Chi Minh City, Vietnam;
In unbiased non-centrosymmetric semiconductors electronic currents can be generated directly by optical laser pulses.
Combining k.p-perturbation theory with the semiconductor Bloch equations provides an approach to theoretically describe these photocurrents in bulk and quantum well systems [1,2].
We investigate shift and rectification currents in bulk GaAs and GaAs quantum well systems.
The transparent approach of the semiconductor Bloch equations allows to identify the microscopic origin of several phenomena.
Using a geodesic grid for the discretization of the k-space we are able to include the Coulomb interaction and to investigate excitonic contributions.
R. Podzimski, H. T. Duc, and T. Meier, Proc. SPIE 97460W, 9746 (2016).
H. T. Duc, R. Podzimski, S. Priyadarshi, M. Bieler, and T. Meier, Phys. Rev. B 94, 085305 (2016).