Electron fractionalization under zero magnetic field in 2D moiré superlattices

ORAL · Invited

Abstract

Moiré materials are formed by stacking 2D crystals of semiconductors or semimetals with a small difference in lattice constant or orientation. They provide a highly controllable platform to explore effects of electron correlations and topology. Specifically, flat Chern bands have been predicted in twisted transition metal dichalcogenide semiconductors. In this talk, I will discuss recent experiments that demonstrate electron fractionalization under zero magnetic field in moiré semiconductors: the fractional Chern insulators and fractional quantum spin Hall insulator in small-angle-twisted MoTe2 bilayers.

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Publication: Y. Zeng, Z. Xia, K. Kang, J. Zhu, P. Knüppel, C. Vaswani, K. Watanabe, T. Taniguchi, K.F. Mak, and J. Shan, "Thermodynamic evidence of fractional Chern insulator in moiré MoTe2," Nature 622, 69–73 (2023).
K. Kang, B. Shen, Y. Qiu, Y, Zeng, Z. Xia, K. Watanabe, T. Taniguchi, J. Shan, and K.F. Mak, "Observation of the fractional quantum spin Hall effect in moiré MoTe2," Nature 628, 522–526 (2024).

Presenters

  • Jie Shan

    Cornell University

Authors

  • Jie Shan

    Cornell University