Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Ultra-fast Phenomena
HL 5.2: Vortrag
Montag, 22. März 2010, 10:30–10:45, H17
Microscopic theory of two-dimensional THz spectroscopy in quantum well systems — •Sebastian Eiser1, Marten Richter1, Carsten Weber1, Thi Uyen-Kahn Dang1, Wilhelm Kuehn2, and Andreas Knorr1 — 1Institute of Theoretical Physics, TU-Berlin, Germany — 2Max Born Institute, Berlin, Germany
Pump-probe and n-wave-mixing experiments are important in order to reveal information about microscopic coupling mechanisms and structural/dynamical relationships. Varying the time delay between the incident pulses and recording the real time dynamics makes the technique inherently two-dimensional. It has been demonstrated in the THz regime [1] that with the combination of a collinear beam setup and electro-optical sampling all orders of n-wave-mixing can be observed at the same time. We have developed a theoretical model for a corresponding nonlinear two-dimensional spectroscopy. We numerically solve the equations of motions within a density-matrix approach, focusing on the influence of the electron-phonon interaction [2] on the nonlinear dynamics. Our investigations are performed on GaAs/AlGaAs quantum wells and show good agreement to experimental findings.
[1] W. Kuehn et al., J. Chem. Phys. 130, 1 (2009)
[2] S. Butscher et al., Phys. Status Solidi B 241, 11, R49 (2004)