Electrically Tunable, Large Excitonic Reflectivity from an Atomically Thin Semiconductor

ORAL

Abstract

Two dimensional transition metal dichalcogenide (TMD) monolayers are direct bandgap semiconductors that feature tightly bound excitons. TMDs can be easily integrated with various functional substrates or materials through van der Waals stacking. For these reasons, TMDs are particularly interesting both for novel device applications as well as studies of fundamental physics. In this work, we show that a monolayer of the TMD MoSe2 encapsulated by hexagonal boron nitride can reflect up to 85% of incident light at the excitonic resonance. We study the root of this high reflectance: the excellent coherence properties of excitons in this atomically thin semiconductor. Moreover, we show that power and wavelength dependent nonlinearities in these systems stem from exciton-based lattice heating and exciton-exciton interactions.

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Presenters

  • Giovanni Scuri

    Harvard Univ, Physics, Harvard University, Harvard University

Authors

  • Giovanni Scuri

    Harvard Univ, Physics, Harvard University, Harvard University

  • You Zhou

    Harvard Univ, Physics, Harvard University, Physics, Chemistry and Chemical Biology, Harvard University, Harvard University

  • Alexander High

    Institute for Molecular Engineering, University of Chicago, University of Chicago

  • Dominik Wild

    Harvard Univ, Physics, Harvard University, Harvard University

  • Chi Shu

    Physics, Harvard University, Harvard Univ

  • Kristiaan De Greve

    Harvard Univ, Physics, Harvard University, Harvard University

  • Luis Jauregui

    Department of Physics, Harvard University, Harvard Univ, Physics, Harvard University, Harvard University

  • Philip Kim

    Physics, Harvard University, Harvard University, Department of Physics, Harvard University, Harvard Univ, Physics, Harvard, Department of Physics, Harvard university, School of Applied Sciences and Engineering, Harvard University

  • Mikhail Lukin

    Harvard University, Physics, Harvard Univ, Harvard Univ, Department of Physics, Harvard University, Physics, Harvard University

  • Hongkun Park

    Harvard Univ, Physics, Harvard University, Physics, Chemistry and Chemical Biology, Harvard University, Harvard University, Chemistry and Physics, Harvard University