High-frequency rectifiers based on type-II Dirac fermions
| Autor: | Debashis Mondal, Jun Fuji, Xiaoshuang Chen, Yao Yang, Li Han, Kaixuan Zhang, Huang Xu, Antonio Politano, Barun Ghosh, Chia Nung Kuo, Libo Zhang, Ivana Vobornik, Zhiqingzi Chen, Wei Lu, Chin-Shan Lue, Amit Agarwal, Lin Wang, Huaizhong Xing, Guo Wanlong |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nonlinear optics
Terahertz radiation Science Dirac (software) General Physics and Astronomy Physics::Optics 02 engineering and technology 01 natural sciences Electromagnetic radiation General Biochemistry Genetics and Molecular Biology Article symbols.namesake Gapless playback Rectification Electronic and spintronic devices 0103 physical sciences Electronic devices Topological insulators Symmetry breaking 010306 general physics Physics Multidisciplinary Condensed matter physics General Chemistry 021001 nanoscience & nanotechnology Polarization (waves) Dirac fermion symbols 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2041-1723 |
| Popis: | The advent of topological semimetals enables the exploitation of symmetry-protected topological phenomena and quantized transport. Here, we present homogeneous rectifiers, converting high-frequency electromagnetic energy into direct current, based on low-energy Dirac fermions of topological semimetal-NiTe2, with state-of-the-art efficiency already in the first implementation. Explicitly, these devices display room-temperature photosensitivity as high as 251 mA W−1 at 0.3 THz in an unbiased mode, with a photocurrent anisotropy ratio of 22, originating from the interplay between the spin-polarized surface and bulk states. Device performances in terms of broadband operation, high dynamic range, as well as their high sensitivity, validate the immense potential and unique advantages associated to the control of nonequilibrium gapless topological states via built-in electric field, electromagnetic polarization and symmetry breaking in topological semimetals. These findings pave the way for the exploitation of topological phase of matter for high-frequency operations in polarization-sensitive sensing, communications and imaging. High-frequency rectifiers at terahertz regime are pivotal components in modern communication, whereas the drawbacks in semiconductor junctions-based devices inhibit their usages. Here, the authors report electromagnetic rectification with high signal-to-noise ratio driven by chiral Bloch-electrons in type-II Dirac semimetal NiTe2-based device allowing for efficient THz detection. |
| Databáze: | OpenAIRE |
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