Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Ultra fast phenomena

HL 53.2: Vortrag

Freitag, 30. März 2007, 11:15–11:30, H15

Investigation of Coulomb induced coupling in semiconductor nanostructures using 2D Fourier-Transform-Spectroscopy — •Irina Kuznetsova¹, Peter Thomas¹, Torsten Meier¹, Tianhao Zhang², and Steven T. Cundiff² — ¹Fachbereich Physik, Philipps Universiät Marburg, Renthof 5, 35032 Marburg, Germany — ²JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309-0440, USA

Two-Dimensional Fourier-Transform-Spectroscopy (2DFTS) has been used for the experimental investigation of many-body interactions in semiconductor quantum wells [1]. Our theoretical description used for the interpretation of the experimental data is based on a one-dimensional tight-binding model. By comparing Hartree-Fock results with χ⁽³⁾ coherent many-body calculations we can identify signatures, which are related to various Coulomb effects. We found that due to Coulomb correlations 2DFTS is strongly dependent on polarization directions of excitation pulses [2]. Dipole matrix elements, dephasing times, delay times, polarization directions of the pulses, and their spectral characteristics strongly influence the signatures at the excitonic resonances, i.e., heavy hole, light hole and mixed ones. This demonstrates that this method provides a wide spectrum of information about Coulomb induced couplings in various systems.

[1] X. Li, T. Zhang, C. N. Borca, and S. T. Cundiff, Phys. Rev. Lett. 96, 057406 (2006).

[2] I. Kuznetsova, P. Thomas, T. Meier, T. Zhang, X. Li, R. P. Mirin, and S. T. Cundiff, submitted to Solid State Comm.