Leonid ButovIndirect excitons

ORAL  · Invited

Abstract

A spatially indirect exciton (IX), also known as an interlayer exciton, is a bound pair of an electron and a hole confined in separated layers in a semiconductor heterostructure (HS). Due to their long lifetimes, orders of magnitude longer than lifetimes of spatially direct excitons (DXs), IXs can thermalize below the temperature of quantum degeneracy that gives an opportunity to create quantum excitonic states. We present recent results in quantum IX systems. In GaAs/AlGaAs HS: the Fermi-edge singularity due to the Cooper-pair-like excitons and the excitonic Bose-polarons formed by DXs immersed in degenerate Bose gases of IXs. In MoSe2/WSe2 HS: the IX long-range transport with the 1/e decay distances reaching 100 microns and the IX mediated long-range spin transport with the 1/e decay distances reaching 100 microns.

*The PLE studies in GaAs HS were supported by DOE award DE-FG02-07ER46449, the PL studies in GaAs HS by NSF Grant 1905478, and the GaAs HS growth by Gordon and Betty Moore Foundation Grant GBMF9615 and NSF grant DMR 2011750. The studies in TMD HS were supported DOE award DE-FG02-07ER46449 and the TMD HS manufacturing by NSF grant 1905478.

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Publication: D.J. Choksy, E.A. Szwed, L.V. Butov, K.W. Baldwin, L.N. Pfeiffer, Fermi edge singularity in neutral electron-hole system, Nat. Phys. 19, 1275 (2023).
Erik A. Szwed, Brian Vermilyea, Darius J. Choksy, Zhiwen Zhou, Michael M. Fogler, Leonid V. Butov, Dmitry K. Efimkin, Kirk W. Baldwin, Loren Pfeiffer, Excitonic Bose Polarons in Electron-Hole Bilayers, Nano Lett. 24, 13219 (2024).
L.H. Fowler-Gerace, Zhiwen Zhou, E.A. Szwed, D.J. Choksy, L.V. Butov, Transport and localization of indirect excitons in a van der Waals heterostructure, Nat. Photon. 18, 823 (2024).
Zhiwen Zhou, E.A. Szwed, D.J.Choksy, L.H. Fowler-Gerace, L.V. Butov, Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure, Nat. Commun. 15, 9454 (2024).

Presenters

  • Leonid V Butov

    • University of California, San Diego

Authors

  • Leonid V Butov

    • University of California, San Diego