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).<br>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
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Jie Shan
Cornell University
Authors
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Jie Shan
Cornell University