Evidence for Two-dimensional Weyl Fermions in Air-Stable Monolayer PtTe$_{1.75}$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866917867332567040 |
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| author | Cai, Zhihao Cao, Haijun Sheng, Haohao Hu, Xuegao Sun, Zhenyu Zhao, Qiaoxiao Gao, Jisong Ideta, Shin-ichiro Shimada, Kenya Huang, Jiawei Cheng, Peng Chen, Lan Yao, Yugui Meng, Sheng Wu, Kehui Wang, Zhijun Feng, Baojie |
| author_facet | Cai, Zhihao Cao, Haijun Sheng, Haohao Hu, Xuegao Sun, Zhenyu Zhao, Qiaoxiao Gao, Jisong Ideta, Shin-ichiro Shimada, Kenya Huang, Jiawei Cheng, Peng Chen, Lan Yao, Yugui Meng, Sheng Wu, Kehui Wang, Zhijun Feng, Baojie |
| contents | The Weyl semimetals represent a distinct category of topological materials wherein the low-energy excitations appear as the long-sought Weyl fermions. Exotic transport and optical properties are expected because of the chiral anomaly and linear energy-momentum dispersion. While three-dimensional Weyl semimetals have been successfully realized, the quest for their two-dimensional (2D) counterparts is ongoing. Here, we report the realization of 2D Weyl fermions in monolayer PtTe$_{1.75}$, which has strong spin-orbit coupling and lacks inversion symmetry, by combined angle-resolved photoemission spectroscopy, scanning tunneling microscopy, second harmonic generation, X-ray photoelectron spectroscopy measurements, and first-principles calculations. The giant Rashba splitting and band inversion lead to the emergence of three pairs of critical Weyl cones. Moreover, monolayer PtTe$_{1.75}$ exhibits excellent chemical stability in ambient conditions, which is critical for future device applications. The discovery of 2D Weyl fermions in monolayer PtTe$_{1.75}$ opens up new possibilities for designing and fabricating novel spintronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20606 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for Two-dimensional Weyl Fermions in Air-Stable Monolayer PtTe$_{1.75}$ Cai, Zhihao Cao, Haijun Sheng, Haohao Hu, Xuegao Sun, Zhenyu Zhao, Qiaoxiao Gao, Jisong Ideta, Shin-ichiro Shimada, Kenya Huang, Jiawei Cheng, Peng Chen, Lan Yao, Yugui Meng, Sheng Wu, Kehui Wang, Zhijun Feng, Baojie Mesoscale and Nanoscale Physics Materials Science The Weyl semimetals represent a distinct category of topological materials wherein the low-energy excitations appear as the long-sought Weyl fermions. Exotic transport and optical properties are expected because of the chiral anomaly and linear energy-momentum dispersion. While three-dimensional Weyl semimetals have been successfully realized, the quest for their two-dimensional (2D) counterparts is ongoing. Here, we report the realization of 2D Weyl fermions in monolayer PtTe$_{1.75}$, which has strong spin-orbit coupling and lacks inversion symmetry, by combined angle-resolved photoemission spectroscopy, scanning tunneling microscopy, second harmonic generation, X-ray photoelectron spectroscopy measurements, and first-principles calculations. The giant Rashba splitting and band inversion lead to the emergence of three pairs of critical Weyl cones. Moreover, monolayer PtTe$_{1.75}$ exhibits excellent chemical stability in ambient conditions, which is critical for future device applications. The discovery of 2D Weyl fermions in monolayer PtTe$_{1.75}$ opens up new possibilities for designing and fabricating novel spintronic devices. |
| title | Evidence for Two-dimensional Weyl Fermions in Air-Stable Monolayer PtTe$_{1.75}$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2407.20606 |