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A Charge Density Wave Activated Exciton in TiSe<sub>2</sub>-MoSe<sub>2</sub> Heterostructures

ORAL

Abstract

Van der Waals heterostructures allow for the exploration of interface physics without the constraint of lattice matching. In this study we examine proximity effects in a vdW heterostructure comprised of TiSe2 and monolayer MoSe2. Using temperature-dependent, spatially-resolved photoluminescence (PL) microscopy we discover a new MoSe2 PL emission line at the TiSe2-MoSe2 interface. This PL line appears 30 meV above the MoSe2 neutral exciton which excludes localized or trapped excitons as a viable explanation. Temperature-dependent measurements show a surprising correlation of the high energy PL line with the TiSe2 CDW state, thus suggesting the CDW plays a central role in activating this previously unobserved exciton. We discuss possible CDW-based origins of this feature and outline future opportunities for using proximity effects in vdW heterostructures to engineer novel excitonic states.

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Presenters

  • Patrick M Vora

    George Mason University, Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

Authors

  • Jaydeep Joshi

    Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University, George Mason University

  • Benedikt Scharf

    Julius-Maximilians University of Wuerzburg

  • Igor Mazin

    George Mason University, Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, USA, Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Sergiy Krylyuk

    National Institute of Standards and Technology

  • Daniel J Campbell

    University of Maryland, College Park

  • Johnpierre Paglione

    University of Maryland, College Park, Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA, Univ of Maryland-College Park

  • Albert Davydov

    Materials Science and Engineering Division, National Institute of Science and Technology, National Institute of Standards and Technology, Materials Science and Engineering Division - National Institute of Standards and Technology

  • Igor Zutic

    State Univ of NY - Buffalo

  • Patrick M Vora

    George Mason University, Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University