Ultrafast dynamical response of the lower exciton-polariton branch in CdZnTe

J. Lohrenz, S. Melzer, C. Ruppert, I. A. Akimov, H. Mariette, M. Reichelt, A. Trautmann, T. Meier, and M. Betz
Phys. Rev. B 93, 075201 – Published 2 February 2016

Abstract

We investigate the transient optical response in high-quality Cd0.88Zn0.12Te crystals in the regime of slow light propagation on the lower exciton-polariton branch. Femtosecond photoexcitation leads to very substantial transmission changes in a 10-meV broad spectral range within the transparency window of the unexcited semiconductor. These nonlinear optical signatures decay on picosecond time scales governed by carrier thermalization and recombination. The temporal and spectral dependence indicate the dynamical optical response as arising from excitation-induced dephasing and perturbed free induction decay. Model simulations for the optical response taking into account the actual exciton-polariton dispersion and excitation-induced dephasing of a nonlinearly driven two-level system support this interpretation.

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  • Received 13 December 2015
  • Revised 13 January 2016

DOI:https://doi.org/10.1103/PhysRevB.93.075201

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Lohrenz1, S. Melzer1, C. Ruppert1, I. A. Akimov1, H. Mariette2, M. Reichelt3, A. Trautmann3, T. Meier3, and M. Betz1

  • 1Experimentelle Physik 2, TU Dortmund, Otto-Hahn-Strasse 4, 44221 Dortmund, Germany
  • 2CEA-CNRS Group Nanophysique et Semiconducteurs, Institut Neel, Université Grenoble-Alpes, 25 Avenue des Martyrs, 38042 Grenoble, France
  • 3Department Physik & CeOPP, Universität Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany

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Issue

Vol. 93, Iss. 7 — 15 February 2016

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