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Quantum beats in the polarization of the spin-dependent photon echo from donor-bound excitons in CdTe/(Cd,Mg)Te quantum wells

S. V. Poltavtsev, I. A. Yugova, Ia. A. Babenko, I. A. Akimov, D. R. Yakovlev, G. Karczewski, S. Chusnutdinow, T. Wojtowicz, and M. Bayer
Phys. Rev. B 101, 081409(R) – Published 18 February 2020
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Abstract

We study the quantum beats in the polarization of the two-pulse photon echo from donor-bound exciton ensembles in semiconductor quantum wells. To induce these quantum beats, a sequence composed of a circularly polarized and a linearly polarized picosecond laser pulse in combination with an external transverse magnetic field is used. This results in an oscillatory behavior of the photon echo amplitude, detected in the σ+ and σ circular polarizations, occurring with opposite phases relative to each other. The beating frequency is the sum of the Larmor frequencies of the resident electron and the heavy hole when the second pulse is polarized along the magnetic field. The beating frequency is, on the other hand, the difference of these Larmor frequencies when the second pulse is polarized orthogonal to the magnetic field. The measurement of both beating frequencies serves as a method to determine precisely the in-plane hole g factor, including its sign. We apply this technique to observe the quantum beats in the polarization of the photon echo from the donor-bound excitons in a 20-nm-thick CdTe/Cd0.76Mg0.24Te quantum well. From these quantum beats we obtain the in-plane heavy-hole g factor gh=0.143±0.005.

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  • Received 26 November 2019
  • Revised 23 January 2020
  • Accepted 24 January 2020

DOI:https://doi.org/10.1103/PhysRevB.101.081409

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. V. Poltavtsev1,2,*, I. A. Yugova2,3, Ia. A. Babenko2,3, I. A. Akimov1,4, D. R. Yakovlev1,4, G. Karczewski5, S. Chusnutdinow5, T. Wojtowicz6, and M. Bayer1,4

  • 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany
  • 2Spin Optics Laboratory, St. Petersburg State University, 198504 St. Petersburg, Russia
  • 3Physics Faculty, St. Petersburg State University, 199034 St. Petersburg, Russia
  • 4Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
  • 5Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland
  • 6International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland

  • *sergei.poltavtcev@tu-dortmund.de

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Issue

Vol. 101, Iss. 8 — 15 February 2020

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