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dc.contributor.authorMa, Junchaoen_US
dc.contributor.authorGu, Qiangqiangen_US
dc.contributor.authorLiu, Yinanen_US
dc.contributor.authorLai, Jiaweien_US
dc.contributor.authorYu, Pengen_US
dc.contributor.authorZhuo, Xiaoen_US
dc.contributor.authorLiu, Zhengen_US
dc.contributor.authorChen, Jian-Haoen_US
dc.contributor.authorFeng, Jien_US
dc.contributor.authorSun, Dongen_US
dc.identifier.citationMa, J., Gu, Q., Liu, Y., Lai, J., Yu, P., Zhuo, X., ... Sun, D. (2019). Nonlinear photoresponse of type-II Weyl semimetals. Nature Materials, 18, 476-481. doi:10.1038/s41563-019-0296-5en_US
dc.description.abstractThe experimental manifestation of topological effects in bulk materials is attracting enormous research interest. However, direct experimental evidence of the effective k-space monopole of the Weyl nodes has so far been lacking. Here, signatures of the singular topology of the type-II Weyl semimetal TaIrTe4 are revealed in the photoresponses, which are related to divergence of the Berry curvature. TaIrTe4 exhibits a large photoresponsivity of 130.2 mA W−1—with 4 μm excitation in an unbiased field-effect transistor at room temperature—arising from the third-order nonlinear optical response, approaching the performance of commercial low-temperature detectors. In addition, the circularly polarized galvanic response is enhanced at 4 μm, possibly due to the same Berry curvature singularity enhancement. Considering the optical selection rule of chiral Weyl cones, this may open the door for studying and controlling the chiral polarization of Weyl fermions with an electric field in addition to the optical helicities.en_US
dc.relation.ispartofNature Materialsen_US
dc.rights© 2019 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. This paper was published in Nature Materials and is made available with permission of Macmillan Publishers Limited, part of Springer Nature.en_US
dc.titleNonlinear photoresponse of type-II Weyl semimetalsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsNonlinear Opticsen_US
dc.subject.keywordsTopological Matteren_US
dc.description.acknowledgementThe authors acknowledge helpful discussions with Qiong Ma. This project has been supported by the National Natural Science Foundation of China (NSFC Grant Nos. 91750109, 11674013, 11774010, 11704012, 11374021), the National Basic Research Program of China (973 Grant No. 2014CB920900), the National Key Research and Development Program of China (Grant Nos:2018YFA0305604), the Recruitment Program of Global Experts and the State Key Laboratory of Precision Measurement Technology and Instruments Fund for open topicsen_US
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