Quantum dynamics of charge transfer trions in a MoSe2 moir ́e superlattice

ORAL

Abstract

We investigate new many-electron excited states in twisted MoSe2 homobilayers in which optical resonances evolve with twist angle and doping. A unique type of "charge-transfer" trions can be observed when gradual changes in atomic alignment between the layers occur. In real space, the optically excited electron-hole pair resides in a different site from the doped hole in a moir ́e supercell. In momentum space, the exciton resides in the K-valley while the hole occupies the Γ-valley. The rich internal structure of this trion resonance arises from the ultra-flatness of the first valence band and the distinct influence of moir ́e potential modulation on holes and excitons. We apply a powerful spectroscopy method, two-dimensional electronic coherent spectroscopy to investigate the distinct quantum dynamics of different types of neutral and charged excitons in this moir ́e superlattice.

* We gratefully acknowledge funding the Department of Energy, Office of Basic Energy Sciences under grant DE-SC0019398 and the Welch Foundation grant F-1662 for sample preparation. Collaborations are enabled by National Science Foundation via DMREF DMR-2118806 and DMR-2118779.

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Presenters

  • Xiaohui Liu

    University of Texas at Austin

Authors

  • Xiaohui Liu

    University of Texas at Austin

  • Yue Ni

    University of Texas at Austin

  • Zhida Liu

    University of Texas at austin, University of Texas at Austin

  • Haonan Wang

    Washington University in St. Louis

  • Dong Seob Kim

    The University of Texas at Austin, University of Texas at Austin

  • Li Yang

    Washington University, St. Louis

  • Xiaoqin Elaine Li

    University of Texas at Austin, The University of Texas at Austin