In-Vivo Control of Excitons in TMDs

ORAL

Abstract

Excitons in heterostructures of atomically thin transition metal dichalcogenides (TMDs) have recently attracted attention as an appealing platform for optoelectronic and valleytronic devices, with a high degree of in-situ tunability provided through electrostatic gating. A major challenge in achieving such applications is the realization of dynamical control schemes, in which the properties of excitons are not pre-determined at the time of excitation but can also be modulated during their lifetime. Here, we demonstrate such "in-vivo" control of excitons by combining high-frequency electrical control with long-lived interlayer excitons in MoSe2/WSe2 heterobilayers. Through temporally-resolved photoluminescence measurements, we show in-vivo control of various exciton properties, including lifetime and resonance wavelength. These capabilities open the door for novel studies of exciton dynamics and for technological applications such as on-demand photon retrieval and the manipulation of information stored in TMD-based memory devices.

*This work was supposted by DARPA and NSF.

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Presenters

  • Eric Peterson

    • Harvard University

Authors

  • Eric Peterson

    • Harvard University

  • Trond Andersen

    • Harvard University

  • Giovanni Scuri

    • Harvard University

  • Andres M Mier Valdivia

    • Harvard University

  • Andrew Y Joe

    • Harvard University
    • University of California, Berkeley

  • Aleksandr A Zibrov

    • Harvard University

  • Xiaoling Liu

    • Harvard University

  • Andrey Sushko

    • Harvard University

  • Hongkun Park

    • Harvard University

  • Philip Kim

    • Harvard University

  • Mikhail Lukin

    • Harvard University