Investigation of a nonequilibrium polariton condensate in cylindrical micropillars in a strong magnetic field

  • A. S. Brichkin
  • S. I. Novikov
  • A. V. Chernenko
  • C. Schneider
  • S. Hoefling
Solids and Liquids

Abstract

We analyze the photoluminescence of a nonequilibrium polariton condensate in cylindrical micropillars etched on the surface of a high-Q GaAs microcavity in a wide range of detunings in a magnetic field up to 12 T for various levels of nonresonant laser pumping by nanosecond pulses. With such a method of excitation, a considerable effect of the interaction of the reservoir of photoexcited excitons with the condensate on the Zeeman splitting of the polariton condensate levels can be expected, which can lead to a decrease in its value and even to sign reversal. However, the measurements of photoluminescence in a wide range of optical excitation densities show that Zeeman splitting weakly depends on the optical pumping (its variation does not exceed 15% of the splitting in a field of 12 T). The estimation of the exciton density in the reservoir based on these data gives a value lower than 108 cm–2. In addition, a noticeable decrease (by a factor of about 1.8) in the polariton condensation threshold in a magnetic field is detected.

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • A. S. Brichkin
    • 1
  • S. I. Novikov
    • 1
  • A. V. Chernenko
    • 1
  • C. Schneider
    • 2
  • S. Hoefling
    • 2
  1. 1.Institute of Solid State PhysicsRussian Academy of SciencesChernogolovkaRussia
  2. 2.Würzburg UniversityWürzburgGermany

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