Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Ultrafast Phenomena I

O 35.9: Talk

Tuesday, March 8, 2016, 12:15–12:30, H10

Ultrafast Pump-Probe Analysis of Exciton-Polariton Propagation — Jan Lohrenz¹, Stephan Melzer¹, Claudia Ruppert¹, Ilya Akimov¹, •Matthias Reichelt², Alexander Trautmann², Torsten Meier², and Markus Betz¹ — ¹Experimentelle Physik 2, TU Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund, Germany — ²Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

In bulk CdZnTe light is significantly slowed down in a spectral range close to the lower exciton-polariton branch. [1] Here, we investigate nonlinear optical signatures in a pump-probe experiment with femtosecond laser pulses. Experimental data and model simulations for the optical response of a nonlinearly driven two-level system suggest that the excitation induced dephasing [2] and slow light propagation lead to unexpected features in the differential transmission spectra. [3]

[1] T. Godde, I. A. Akimov, D. R. Yakovlev, H. Mariette, and M. Bayer, Phys. Rev. B 82, 115332 (2010).
[2] H. Wang, K. Ferrio, D.G. Steel, Y.Z. Hu, R. Binder, and S.W. Koch, Phys. Rev. Lett. 71, 1261 (1993).
[3] J. Lohrenz, S. Melzer, C. Ruppert, I.A. Akimov, M. Reichelt, A. Trautmann, T. Meier, M. Betz, to be published.