Bose-polarons in neutral electron-hole systems in GaAs heterostructure

ORAL

Abstract

We studied cold neutral electron-hole (e-h) systems in separated electron and hole layers in GaAs coupled quantum well heterostructure. The long e-h lifetimes due to the layer separation allow the e-h systems to cool to low temperatures. We found the attractive and repulsive Bose-polarons in the spatially direct absorption (photoluminescence excitation, PLE) spectra. The splitting between polarons enhances with increasing Fermi energy, which is controlled by the laser excitation power in our experiments. The measured polaron splitting is in agreement with our calculations. The polaron splitting in absorption (PLE) is also consistent with the shift from the hydrogen-like excitons to the Cooper-pair-like excitons in PL [Fermi edge singularity in neutral electron–hole system. Nat. Phys. 19, 1275 (2023)] in the cold neutral e-h system.

* *The PL studies were supported by NSF Grant 1905478, the PLE studies by DOE Award DE-FG02-07ER46449, and the heterostructure growth by Gordon and Betty Moore Foundation's Grant GBMF9615 and NSF grant DMR 2011750.

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Presenters

  • Erik A Szwed

    University of California, San Diego

Authors

  • Erik A Szwed

    University of California, San Diego

  • Brian Vermilyea

    University of California, San Diego

  • Darius J Choksy

    University of California San Diego, University of California, San Diego

  • Zhiwen Zhou

    UC San Diego, University of California, San Diego

  • Michael M Fogler

    University of California, San Diego

  • Leonid V Butov

    University of California, San Diego

  • Dmitry K Efimkin

    Monash University

  • Kirk Baldwin

    Princeton University

  • Loren N Pfeiffer

    Princeton University