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

Oral-In-person

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.

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Presenters

  • Jacob Cutshall

    • University of Arizona

Authors

  • Jacob Cutshall

    • University of Arizona

  • Garett Reichenbach

    • University of Arizona

  • Lauren Whitaker

  • Trevor Stanfill

    • University of Arizona

  • Fateme Mahdikhanysarvejahany

  • Daniel Shanks

    • NASA Jet Propulsion Laboratory (JPL)

  • Michael Koehler

  • David Mandrus

    • University of Tennessee

  • Kenji Watanabe

    • National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science

  • Brian LeRoy

    • University of Arizona

  • John Schaibley

    • University of Arizona