Time-resolved photon echoes from donor-bound excitons in ZnO epitaxial layers

S. V. Poltavtsev, A. N. Kosarev, I. A. Akimov, D. R. Yakovlev, S. Sadofev, J. Puls, S. P. Hoffmann, M. Albert, C. Meier, T. Meier, and M. Bayer
Phys. Rev. B 96, 035203 – Published 21 July 2017

Abstract

The coherent optical response from 140 nm and 65 nm thick ZnO epitaxial layers is studied using four-wave-mixing spectroscopy with picosecond temporal resolution. Resonant excitation of neutral donor-bound excitons results in two-pulse and three-pulse photon echoes. For the donor-bound A exciton (D0XA) at temperature of 1.8 K we evaluate optical coherence times T2=3350 ps corresponding to homogeneous line widths of 1319μeV, about two orders of magnitude smaller as compared with the inhomogeneous broadening of the optical transitions. The coherent dynamics is determined mainly by the population decay with time T1=3040 ps, while pure dephasing is negligible. Temperature increase leads to a significant shortening of T2 due to interaction with acoustic phonons. In contrast, the loss of coherence of the donor-bound B exciton (D0XB) is significantly faster (T2=3.6ps) and governed by pure dephasing processes.

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  • Received 12 February 2017
  • Revised 29 May 2017

DOI:https://doi.org/10.1103/PhysRevB.96.035203

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. V. Poltavtsev1,2,*, A. N. Kosarev1,3, I. A. Akimov1,3, D. R. Yakovlev1,3, S. Sadofev4, J. Puls4, S. P. Hoffmann5, M. Albert5, C. Meier5, T. Meier5, and M. Bayer1,3

  • 1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany
  • 2Spin Optics Laboratory, St. Petersburg State University, 198504 St. Petersburg, Russia
  • 3Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
  • 4AG Photonik, Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
  • 5Department Physik & CeOPP, Universität Paderborn, D-33098 Paderborn, Germany

  • *sergei.poltavtcev@tu-dortmund.de

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Issue

Vol. 96, Iss. 3 — 15 July 2017

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