Exciton Localization in Dodecagonal Quasi-crystal WSe2

ORAL

Abstract

Many intriguing properties have been observed in transition metal dichalcogenide moiré superlattices, stemming from flat bands at small twist angles. However, at larger twist angles, moiré patterns are typically incommensurate except for a few discrete angles. Quasicrystalline lattices, which lack transnational symmetry, impose unique influence on the electronic and excitonic states within them. Here, we study excitons in quasi-crystal WSe2 and how they evolve with doping and electric field. Our findings reveal the unique localization properties arising from quasicrystal structures rather than those resulting from impurities which introduce a novel approach to controlling the phases of excitonic states.

* We gratefully acknowledge funding the Department of Energy, Office of Basic Energy Sciences under grant DE-SC0019398 for device fabrication and the Welch Foundation grant F-1662 for sample preparation. Collaborations are enabled by National Science Foundation via MRSEC grants DMR-1720595 and DMR-2308817, DMREF DMR-2118806, DMR-2044920, DMR-2117438.

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Presenters

  • Zhida Liu

    University of Texas at austin, University of Texas at Austin

Authors

  • Zhida Liu

    University of Texas at austin, University of Texas at Austin

  • Qiang Gao

    University of Texas at Austin

  • Yanxing Li

    The University of Texas at Austin

  • Xiaohui Liu

    University of Texas at Austin

  • Fan Zhang

    University of Texas at Austin

  • Dong Seob Kim

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

  • Yue Ni

    University of Texas at Austin

  • Miles Mackenzie

    University of Texas at Austin

  • Hamza Abudayyeh

    University of Texas at Austin

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, Research Center for Electronic and Optical Materials, National Institute for Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science

  • Takashi Taniguchi

    Kyoto Univ, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Sciences, NIMS, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, International Center for Materials Nanoarchitectonics, NIMS, Japan, International Center for Materials Nanoarchitectonics, Tsukuba, National Institue for Materials Science, Kyoto University, National Institute of Materials Science, International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Chih-Kang Shih

    University of Texas at Austin

  • Eslam Khalaf

    University of Texas at Austin, Harvard University

  • Xiaoqin Elaine Li

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