Observation of the amplitude mode in a microcavity polariton condensate driven by quantum fluctuations

ORAL

Abstract

We directly observe emission into the amplitude mode from an exciton-polariton condensate: the signature of this mode being the ghost-branch photoluminescence at energies below the condensate. This amplitude mode, the number-fluctuation variant of the Goldstone mode, appears in many forms of condensed matter; however, the polariton system gives a unique way to passively monitor this mode in the steady-state system without driving the population far out of equilibrium. This mode is predicted to manifest as an excitation of condensed particles into the upper-polariton state. Here we present experimental results in agreement with our theoretical analysis. Additionally, we present a family of ghost-branch modes that require an expanded theory to capture.

*This work was authored in part by the National Renewable Energy Laboratory, operated by Alliance for Sustainable Energy, LLC, for the U.S. Department of Energy (DOE) under Contract No. DE-AC36-08GO28308. Funding provided by the DOE Office of Science BES under DE-AC36-08GO28308 and the LDRD Program at NREL. Work at Argonne supported by DOE office of science basic energy sciences, materials science and engineering under contract DE-AC02-06CH11357. R. H. was supported by a Grand-in-Aid for JSPS fellows (Grant No. 17J01238)

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Presenters

  • Mark Steger

    • National Renewable Energy Laboratory

Authors

  • Mark Steger

    • National Renewable Energy Laboratory

  • Ryo Hanai

    • James Franck Institute and Department of Physics, University of Chicago

  • Alexander Edelman

    • University of Chicago
    • James Franck Institute and Department of Physics, University of Chicago
    • University of Chicago and Argonne National Laboratory

  • Peter B Littlewood

    • Argonne National Lab
    • James Franck Institute and Department of Physics, University of Chicago
    • Condensed Matter Theory, Argonne National Laboratory
    • University of Chicago and Argonne National Laboratory
    • Materials Science Division, Argonne National Laboratory

  • David Wayne Snoke

    • Physics and Astronomy, University of Pittsburgh
    • Univ of Pittsburgh
    • Astronomy and Physics, University of Pittsburgh
    • University of Pittsburgh

  • Jonathan Beaumariage

    • Physics and Astronomy, University of Pittsburgh
    • Univ of Pittsburgh
    • Astronomy and Physics, University of Pittsburgh

  • Brian Fluegel

    • National Renewable Energy Laboratory

  • Kenneth West

    • Princeton University
    • Electrical Engineering, Princeton University
    • Electrical engineering, Princeton university
    • Princeton Univ
    • Department of Electrical Engineering, Princeton University
    • electrical engineering, Princeton
    • Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

  • Loren Pfeiffer

    • Princeton University
    • Electrical Engineering, Princeton University
    • Electrical engineering, Princeton university
    • Princeton Univ
    • Department of Electrical Engineering, Princeton University
    • electrical engineering, Princeton
    • Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

  • Angelo J Mascarenhas

    • National Renewable Energy Laboratory