Cited by 327Topological Materials and Phenomena2D Materials and ApplicationsAdvanced Condensed Matter Physics

Nonlinear photoresponse of type-II Weyl semimetals

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Ma, Junchao, Gu, Qiangqiang, Liu, Yinan, Lai, Jiawei, Yu, Peng, Zhuo, Xiao, Liu, Zheng, Chen, Jian-Hao +2 more·2019·Nature Materials

Abstract

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 TaIrTe 4 are revealed in the photoresponses, which are related to divergence of the Berry curvature. TaIrTe 4 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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Crossref · 10.1038/s41563-019-0296-5

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  • In Weyl semimetals, polarization-dependent photocurrent measurements point towards a geometric contribution to the shift current, revealed by a colossal bulk photovoltaic effect attributed to divergent Berry curvature near the Weyl nodes.

    “polarization-dependent photocurrent measurements in the latter point towards a geometric contribution to the shift current, revealed by a colossal bulk photovoltaic effect attributed to divergent Berry curvature near the Weyl nodes.”

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Authors
Ma, J., Gu, Q., Liu, Y., Lai, J., Yu, P., Zhuo, X., Liu, Z., Chen, J.-H., Feng, J., & Sun, D.
Affiliations
  • Peking University (CN)
  • Nanyang Technological University (SG)
Corresponding author
  • Feng, Ji
  • Sun, Dong
Venue
Nature Materials
Published
2019-03-04
Volume
18
Issue
5
Pages
476-481
ISSN
  • 1476-1122 (ISSN-L)
  • 1476-4660
OpenAlex
W2918878338
Cited by
327
References
40
Citations by year
2026: 24 · 2025: 64 · 2024: 54 · 2023: 41 · 2022: 43 · 2021: 49 · 2020: 40 · 2019: 12
FWCI
15.86
Type
journal article
Language
en
Open access
Locations
  • Nature Materials (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • DR-NTU (Nanyang Technological University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
Keywords
type-II Weyl semimetal, TaIrTe4, nonlinear photoresponse, third-order optical nonlinearity, infrared detection, Weyl points, topological photonics

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