Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: THz Physics

HL 28.4: Vortrag

Montag, 14. März 2011, 18:15–18:30, POT 51

Microscopic model of two-dimensional THz spectroscopy: Quantum well intersubband dynamics — •Thi Uyen-Khanh Dang¹, Sebastian Eiser², Andreas Knorr¹, Marten Richter³, Wilhelm Kühn⁴, Michael Wörner⁴, and Carsten Weber¹ — ¹Institut für Theoretische Physik, Technische Universität Berlin, Germany — ²European Space Research Institute, Frascati, Italy — ³Department of Chemistry, University of California Irvine, USA — ⁴Max Born Institut, Berlin, Germany

Time resolved two-dimensional spectroscopy combined with field-resolved detection allow important insights into the nonlinear optical response of a sample [1]: A variation of the time delay between the collinear pump and probe pulses enables the simultaneous detection of all orders of n-wave mixing, which can be separated in the frequency domain. Here, a theoretical model is presented to describe the corresponding experimental setup, performed on a GaAs/AlGaAs multiple quantum well sample. Within a density-matrix approach, the equations of motions for the electron density and the intersubband coherence are derived. Focusing on the electron-phonon interaction [2], its influence on the two-dimensional intersubband absorption spectrum is investigated. Experimentally observed signatures are reproduced in the theoretical simulations.

[1] W. Kühn et al., J. Chem. Phys. 130, (2009)

[2] S. Butscher et al., Phys. Rev. B. 72, (2005)