Coherent interlayer exciton states in MoSe<sub>2</sub>/WSe<sub>2</sub> heterostructures

ORAL

Abstract

Temperature dependent, long range spatial coherence associated with interlayer exciton (IX) superfluidity has been observed in MoSe2/hBN/WSe2 heterostructures. In these systems, the hBN spacer suppresses the moiré and decreases the IX effective mass, allowing for long range exciton flow. In contrast, direct contact MoSe2/WSe2 heterostructures host long-lived, high effective mass, IXs subject to a moiré potential. The moiré potential present in such heterostructures confines IXs and suppresses their spatial coherence. We study the temporal and spatial coherence properties of an R-type direct contact, gated, MoSe2/WSe2 heterostructure when subject to an applied electric field and when doped. We use a Mach-Zehnder interferometer to interfere the photoluminescent (PL) emission from the heterostructure and control the spatial separation in each arm of the interferometer. We will report on the evolution of the spatial and temporal coherence as a function of doping and electric field.

*Funding Acknowlegement: We acknowledge support from NSF Grant Nos. DMR-2003583, ECCS-2054572, ECCS-2428575, and AFOSR Grant Nos. FA9550-20-1-0217, FA9550-22-1-0312, FA9550-22-1-0113. This work was supported by the Gordon and Betty Moore Foundation, grant DOI 10.37807/GBMF13840.

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Presenters

  • Jacob Cutshall

    • University of Arizona

Authors

  • Jacob Cutshall

    • University of Arizona

  • Garett Don Reichenbach

    • University of Arizona

  • Lauren Whitaker

    • University of Arizona

  • Trevor Stanfill

    • University of Arizona

  • Fateme Mahdikhanysarvejahany

    • University of Arizona

  • Daniel Noah Shanks

    • NASA Jet Propulsion Laboratory (JPL)

  • Michael Koehler

    • University of Tennessee

  • David Mandrus

    • University of Tennessee

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Brian J LeRoy

    • University of Arizona

  • John R Schaibley

    • University of Arizona