Nonlinear photoresponse of type-II Weyl semimetals

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...

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Main Authors: Ma, Junchao, Gu, Qiangqiang, Liu, Yinan, Lai, Jiawei, Yu, Peng, Zhuo, Xiao, Liu, Zheng, Chen, Jian-Hao, Feng, Ji, Sun, Dong
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143285
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1432852023-07-14T15:59:19Z Nonlinear photoresponse of type-II Weyl semimetals Ma, Junchao Gu, Qiangqiang Liu, Yinan Lai, Jiawei Yu, Peng Zhuo, Xiao Liu, Zheng Chen, Jian-Hao Feng, Ji Sun, Dong School of Materials Science and Engineering Science::Physics Nonlinear Optics Topological Matter 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. Accepted version The 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 topics 2020-08-19T04:03:34Z 2020-08-19T04:03:34Z 2019 Journal Article Ma, 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/s41563-019-0296-5 1476-1122 https://hdl.handle.net/10356/143285 10.1038/s41563-019-0296-5 18 476 481 en MOE2016-T2-2-153 MOE2017-T2-2-13 Nature Materials © 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. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Nonlinear Optics
Topological Matter
spellingShingle Science::Physics
Nonlinear Optics
Topological Matter
Ma, Junchao
Gu, Qiangqiang
Liu, Yinan
Lai, Jiawei
Yu, Peng
Zhuo, Xiao
Liu, Zheng
Chen, Jian-Hao
Feng, Ji
Sun, Dong
Nonlinear photoresponse of type-II Weyl semimetals
description 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.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Ma, Junchao
Gu, Qiangqiang
Liu, Yinan
Lai, Jiawei
Yu, Peng
Zhuo, Xiao
Liu, Zheng
Chen, Jian-Hao
Feng, Ji
Sun, Dong
format Article
author Ma, Junchao
Gu, Qiangqiang
Liu, Yinan
Lai, Jiawei
Yu, Peng
Zhuo, Xiao
Liu, Zheng
Chen, Jian-Hao
Feng, Ji
Sun, Dong
author_sort Ma, Junchao
title Nonlinear photoresponse of type-II Weyl semimetals
title_short Nonlinear photoresponse of type-II Weyl semimetals
title_full Nonlinear photoresponse of type-II Weyl semimetals
title_fullStr Nonlinear photoresponse of type-II Weyl semimetals
title_full_unstemmed Nonlinear photoresponse of type-II Weyl semimetals
title_sort nonlinear photoresponse of type-ii weyl semimetals
publishDate 2020
url https://hdl.handle.net/10356/143285
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