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Physics of the Solid State

, Volume 60, Issue 12, pp 2623–2627 | Cite as

Polarization Spectroscopy of an Isolated Quantum Dot and an Isolated Quantum Wire

  • V. N. KatsEmail author
  • A. V. Platonov
  • G. E. Tsyrlin
  • A. D. Buravlev
  • A. Delga
  • L. Besombes
  • H. Mariette
  • V. P. Kochereshko
LOW-DIMENSIONAL SYSTEMS

Abstract

Photoluminescence spectra of an isolated GaAs quantum dot within an AlGaAs quantum wire are studied. The examination of behavior of spectra in a magnetic field provided an opportunity to estimate the exciton binding energy in the quantum dot, which turned out to be 10 times higher than the bulk exciton binding energy in GaAs. It is demonstrated that the signal of exciton photoluminescence from the quantum dot emitted along the nanowire axis is linearly polarized. At the same time, the photoluminescence signal propagating in the direction perpendicular to the nanowire axis is almost unpolarized. This may be attributed to the nonaxial dot positioning in the wire under a giant increase in the binding energy of an exciton affected by an image potential.

Notes

ACKNOWLEDGMENTS

V.P. Kochereshko acknowledges support from the “Electron Correlations in Systems with Strong Interaction” program of the Physical Sciences Division of the Russian Academy of Sciences. The work of A.V. Platonov was supported by program no. 9 “Terahertz Optoelectronics and Spintronics” of the Presidium of the Russian Academy of Sciences.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. N. Kats
    • 1
    Email author
  • A. V. Platonov
    • 1
  • G. E. Tsyrlin
    • 1
  • A. D. Buravlev
    • 1
  • A. Delga
    • 2
  • L. Besombes
    • 2
  • H. Mariette
    • 2
  • V. P. Kochereshko
    • 1
  1. 1.Ioffe InstituteSt. PetersburgRussia
  2. 2.Institut NéelGrenobleFrance

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