| 1 | Giant nonlinear Hall effect in twisted bilayer WSe_(2)显示文摘The recently discovered nonlinear Hall effect(NHE)in a few non-interacting systems provides a novel mechanism for generating second-harmonic electrical Hall signals under time-reversal-symmetric conditions.Here,we introduce a new approach to engineering an NHE by using twisted moiréstructures.We found that the twisted WSe_(2)bilayer exhibited an NHE when the Fermi level was tuned to the moiréflat bands.When the first moiréband was half-filled,the nonlinear Hall signal exhibited a sharp peak with a generation efficiency that was at least two orders of magnitude greater than those obtained in previous experiments.We discuss the possible origins of the diverging generation efficiency in twisted WSe_(2)based on resistivity measurements,such as moiré-interface-induced correlation effects and mass-diverging-type continuous Mot transition.This study demonstrates not only how interaction effects can combine with Berry curvature dipoles to produce novel quantum phenomena,but also the potential of NHE measurements as a new tool for studying quantum criticality. | Meizhen Huang Zefei Wu Jinxin Hu Xiangbin Cai En Li Liheng An Xuemeng Feng Ziqing Ye Nian Lin Kam Tuen Law Ning Wang | 2023 | National Science Review2023，10，4： | 0 |
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