Valley mediated singlet- and triplet-polaron dynamics in a doped WSe<sub>2</sub> monolayer

ORAL

Abstract

The valley degree of freedom, as an additional quantum index in the electronic bands of solids, has found an increasingly important role in understanding the electronic and optical properties of atomically thin materials. Here, we study the formation of new optical resonances in a WSe2 monolayer as the doping level gradually increases. Singlet and triplet polarons are new quasiparticles that arise when optically excited electron-hole pairs couple to the Fermi sea in the same or opposite valleys. Using two-dimensional electronic coherent spectroscopy, we reveal their distinct quantum dephasing, valley depolarization, and tunable valley coherence.

*We gratefully acknowledge funding from DE-SC0019398, NSF DMR-1808042, and Welch Foundation F-1662.

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Presenters

  • Yue Ni

    • University of Texas at Austin

Authors

  • Yue Ni

    • University of Texas at Austin

  • Yue Ni

    • University of Texas at Austin

  • Di Huang

    • University of Texas at Austin
    • Tongji University

  • danfu liang

    • University of Texas at Austin

  • Xiaohui Liu

    • University of Texas at Austin
    • University of texas at asutin

  • Kevin C Sampson

    • University of Texas at Austin

  • Zhida Liu

    • University of Texas at austin

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Eric W Martin

    • MONSTR Sense Technologies
    • MONSTR Sense Technologies, LLC

  • Jesper Levinsen

    • Monash University

  • Meera Parish

    • Monash University

  • Dmitry K Efimkin

    • Monash University

  • Xiaoqin Elaine Li

    • University of Texas at Austin