Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
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)