Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-021-20983-1
Title: Quantum frequency doubling in the topological insulator Bi2Se3
Authors: He, Pan
Isobe, Hiroki
Zhu, Dapeng 
Hsu, Chuang-Han 
Fu, Liang
Yang, Hyunsoo 
Issue Date: 29-Jan-2021
Publisher: Nature Research
Citation: He, Pan, Isobe, Hiroki, Zhu, Dapeng, Hsu, Chuang-Han, Fu, Liang, Yang, Hyunsoo (2021-01-29). Quantum frequency doubling in the topological insulator Bi2Se3. Nature Communications 12 (1) : 698. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-021-20983-1
Rights: Attribution 4.0 International
Abstract: The nonlinear Hall effect due to Berry curvature dipole (BCD) induces frequency doubling, which was recently observed in time-reversal-invariant materials. Here we report novel electric frequency doubling in the absence of BCD on a surface of the topological insulator Bi2Se3 under zero magnetic field. We observe that the frequency-doubling voltage transverse to the applied ac current shows a threefold rotational symmetry, whereas it forbids BCD. One of the mechanisms compatible with the symmetry is skew scattering, arising from the inherent chirality of the topological surface state. We introduce the Berry curvature triple, a high-order moment of the Berry curvature, to explain skew scattering under the threefold rotational symmetry. Our work paves the way to obtain a giant second-order nonlinear electric effect in high mobility quantum materials, as the skew scattering surpasses other mechanisms in the clean limit. © 2021, The Author(s).
Source Title: Nature Communications
URI: https://scholarbank.nus.edu.sg/handle/10635/233084
ISSN: 2041-1723
DOI: 10.1038/s41467-021-20983-1
Rights: Attribution 4.0 International
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