The 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.
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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.
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The authors acknowledge helpful discussions with J. Sipe, R. Muniz and Q. Ma. This project was supported by the National Natural Science Foundation of China (NSFC grants nos. 91750109, 11725415, 11674013, 11774010, 11704012 and 11374021), the National Basic Research Program of China (973 grant no. 2014CB920900), the National Key Research and Development Program of China (grants nos. 2018YFA0305601, 2018YFA0305604 and 2016YFA0301004), the Recruitment Program of Global Experts and the State Key Laboratory of Precision Measurement Technology and Instruments Fund for open topics. Z.L. and P.Y. acknowledge support from the Singapore National Research Foundation under NRF award number NRF-RF2013-08, MOE Tier 2 MOE2016-T2-2-153 and MOE2017-T2-2-136. J.F. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant no. XDB28000000). The computations are supported by the High-performance Computing Platform of Peking University and the Tianhe-1 National Supercomputing Center in Tianjin.
The authors declare no competing interests.
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Ma, J., Gu, Q., Liu, Y. et al. Nonlinear photoresponse of type-II Weyl semimetals. Nat. Mater. 18, 476–481 (2019). https://doi.org/10.1038/s41563-019-0296-5
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