Imaging and Spectroscopy of an Exciton Condensate

ORAL

Abstract

We study the spatial and spectral properties of the photoluminescence of an exciton liquid at low temperatures and show that it evolves from a disordered liquid to a homogenous Bose-Einstein condensate, extending over a few hundred microns and covering the entire area of the mesa. The appearance of the condensate is marked by the emergence of a narrow PL peak, which gains strength as the temperature is reduced, and as the power is increased. We suggest that this peak is a result of the dark condensate formation and its interaction with the bright thermal exciton population.

*This work is funded by the Israeli Science Foundation (ISF).

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Presenters

  • Subhradeep Misra

    • Department of Condensed Matter Physics, Weizmann Institute of Science

Authors

  • Subhradeep Misra

    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Michael Stern

    • Physics Department and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University

  • Vladimir Umansky

    • Department of Condensed Matter Physics, Weizmann Institute of Science
    • Department of Condensed matter Physics, Weizmann Institute of Science

  • Israel Bar-Joseph

    • Department of Condensed Matter Physics, Weizmann Institute of Science