Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Ultrafast Phenomena

HL 49.2: Vortrag

Mittwoch, 28. März 2012, 09:45–10:00, EW 202

Two dimensional photon echo spectroscopy applied to quantum well intersubband dynamics — •Thi Uyen-Khanh Dang, Carsten Weber, Sebastian Eiser, Andreas Knorr, and Marten Richter — Institut für Theoretische Physik, Technische Universität Berlin, Deutschland

A thorough understanding of correlation effects and many-body interactions is an important issue for the investigations of intersubband dynamics in semiconductor quantum wells. The two dimensional photon echo spectroscopy is capable of tracking relaxation processes inside the material since it gives a mapping of excitation and response frequency [1]. Here, we calculate the two-dimensional photon echo signal, applied on the dynamics of a single n-doped GaAs/AlGaAs quantum well. Our model calculations are carried out within a density matrix approach using correlation expansion until second order Born including a non-Markovian treatment of electron-phonon interaction [2]. Our results reveal the temporal dynamics of the system for the regime of low carrier densities.

[1] Abramavicius et al., Chem. Rev. 109, (2009)

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