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Colossal Room-Temperature Terahertz Topological Response in Type-II Weyl Semimetal NbIrTe4
Jiantian Zhang1, Tianning Zhang2, Luo Yan3
1State 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.
Advanced Materials (Deerfield Beach, Fla.)
|August 31, 2022
Summary
Researchers developed a new terahertz (THz) detector using a type-II Weyl semimetal (NbIrTe4). This room-temperature device offers high sensitivity and stability, addressing a critical need for advanced THz detection technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Photonics
Background:
- The terahertz (THz) gap lacks efficient room-temperature (RT) detectors.
- Type-II Weyl semimetals (WSMs) show potential for RT topological photoresponses in the THz range.
Purpose of the Study:
- To experimentally realize a THz detector based on a type-II WSM.
- To investigate the performance and characteristics of such a device for THz detection.
Main Methods:
- Fabrication of a THz detector using NbIrTe4, a type-II WSM.
- Characterization of the device's photoresponsivity, air stability, and anisotropic conductance at room temperature.
Main Results:
- Achieved a photoresponsivity of 5.7 × 10^4 V W^-1 with one-year air stability at RT.
- Observed record-breaking intrinsic anisotropic conductance (σmax/σmin = 339) and THz response (Iph-max/Iph-min = 40.9).
- Attributed performance to the topological effect of type-II WSM reducing electron effective mass and enhancing mobility.
Conclusions:
- Successfully fabricated the first experimental type-II WSM-based THz detector.
- Demonstrated high sensitivity, stability, and record anisotropic properties for THz detection.
- Opened a new pathway for developing uncooled, highly sensitive THz detectors using type-II WSMs.
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