DataVXAdvanced MaterialsPaper
journal article·2022-10

Colossal Room‐Temperature Terahertz Topological Response in Type‐II Weyl Semimetal NbIrTe4

Jiantian Zhang, Tianning Zhang, Luo Yan, Chao Zhu, Wanfu Shen, Chunguang Hu, Hongxiang Lei, Heng Luo, Daohua Zhang, Fucai Liu, Zheng Liu, Jinchao Tong, Liujiang Zhou, Peng Yu, Guowei Yang

Advanced Materials· Volume 34· Issue 42
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Source abstract

Abstract

Abstract The electromagnetic spectrum between microwave and infrared light is termed the “terahertz (THz) gap,” of which there is an urgent lack of feasible and efficient room‐temperature (RT) THz detectors. Type‐II Weyl semimetals (WSMs) have been predicted to host significant RT topological photoresponses in low‐frequency regions, especially in the THz gap, well addressing the shortcomings of THz detectors. However, such devices have not been experimentally realized yet. Herein, a type‐II WSM (NbIrTe4) is selected to fabricate THz detector, which exhibits a photoresponsivity of 5.7 × 104 V W−1 and a one‐year air stability at RT. Such excellent THz‐detection performance can be attributed to the topological effect of type‐II WSM in which the effective mass of photogenerated electrons can be reduced by the large tilting angle of Weyl nodes to further improve mobility and photoresponsivity. Impressively, this device shows a giant intrinsic anisotropic conductance (σmax/σmin = 339) and THz response (Iph‐max/Iph‐min = 40.9), both of which are record values known. The findings open a new avenue for the realization of uncooled and highly sensitive THz detectors by exploring type‐II WSM‐based devices.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Terahertz technology and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Optoelectronic Materials and Technologies Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Nanotechnology Research Center School of Materials Science and Engineering Sun Yat‐sen University Guangzhou 510275 P. R. China

School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

School of Physics School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 P. R. China

School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 P. R. China

School of Physics and Electronics Central South University Changsha 410083 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Key Technologies Research and Development Program · Natural Science Foundation of Guangdong Province for Distinguished Young Scholars

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