Interlayer Exciton Lifetimes in MoSe2/WSe2 Heterostructures

ORAL

Abstract

Semiconductor heterostructures of two-dimensional (2D) transition-metal dichalcogenides (TMDs) have emerged as an exciting new platform for novel device engineering and physics. A fundamental question for the field is how the strong Coulomb interactions, electronic structure, and underlying valley physics affect the optoelectronic response. While researchers have made significant progress in understanding intralayer exciton dynamics in monolayer TMDs, there is comparatively little understanding of the interlayer excitons that form in their heterostructures. In this talk, we will report on time-resolved photoluminescence experiments of interlayer excitons in MoSe2/WSe2 vertical heterostructures, which show wide tunability with gate and variability with emission energy. We will also discuss the underlying mechanisms for this behavior and show how it can be utilized to generate long-lived valley excitons.

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Authors

  • Kyle Seyler

    Univ of Washington, Department of Physics, University of Washington, No Company Provided

  • Pasqual Rivera

    Univ of Washington, Department of Physics, University of Washington, University of Washington

  • Hongyi Yu

    University of Hong Kong, Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, The Univ of Hong Kong

  • John Schaibley

    Univ of Washington, University of Washington

  • Jiaqiang Yan

    University of Tennessee, University of Tennessee, Knoxville, Oak Ridge National Laboratory, Oak Ridge National Laboratory and University of Tennessee, University of Tennessee, Oak Ridge National Lab

  • D Mandrus

    University of Tennessee, University of Tennessee, Knoxville, University of Tennessee and Oak Ridge National Lab, Univ of Tennessee; Oak Ridge National Laboratory, University of Tennessee, Oak Ridge National Lab, Univ. of Tennessee, Oak Ridge National Lab

  • Wang Yao

    The Univ of Hong Kong, University of Hong Kong

  • Xiaodong Xu

    Univ of Washington, Department of Physics, University of Washington, university of washington, seattle, University of Washington