Symmetry driven spin anisotropic magnetotransport in quantum spin Hall insulator WTe2 1T
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915408368369664 |
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| author | Tapar, Shrushti Weber, Bent Dash, Saroj P Mukherjee, 3 Shantanu Muralidharan, Bhaskaran |
| author_facet | Tapar, Shrushti Weber, Bent Dash, Saroj P Mukherjee, 3 Shantanu Muralidharan, Bhaskaran |
| contents | We present a comprehensive magnetotransport analysis of monolayer 1T WTe2, highlighting the role of nonsymmorphic symmetries in governing edge-state spin behavior. By comparing the electronic transmission in nanoribbons with edges along the crystallographic y and x directions, our analysis reveals a pronounced anisotropy in the magnetic field response. The y-edge ribbon exhibits significant spin splitting of edge-state bands in both energy and momentum space, along with a strong angular dependence of the conductance. The observed magnetotransport response indicates a spin quantization axis that aligns with the out-of-plane spin quantization axis reported in previous experimental studies. In contrast, the x edge ribbon shows negligible spin splitting under magnetic fields, which is attributed to nonsymmorphic symmetries such as glide mirror and screw rotation, that protects degeneracies along the Gamma X direction, even when time-reversal symmetry is broken. The energy-resolved current density and angular transmission analyses confirm that this anisotropy originates from edge states, while bulk states remain largely insensitive to the field orientation. Our results establish direct transport-spectroscopy based evidence of nonsymmorphic-symmetry-protected spin degeneracy in the 1T WTe2, and underscores its promise for spintronic devices that leverage symmetry-protected and directionally selective transport channels. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18543 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Symmetry driven spin anisotropic magnetotransport in quantum spin Hall insulator WTe2 1T Tapar, Shrushti Weber, Bent Dash, Saroj P Mukherjee, 3 Shantanu Muralidharan, Bhaskaran Mesoscale and Nanoscale Physics We present a comprehensive magnetotransport analysis of monolayer 1T WTe2, highlighting the role of nonsymmorphic symmetries in governing edge-state spin behavior. By comparing the electronic transmission in nanoribbons with edges along the crystallographic y and x directions, our analysis reveals a pronounced anisotropy in the magnetic field response. The y-edge ribbon exhibits significant spin splitting of edge-state bands in both energy and momentum space, along with a strong angular dependence of the conductance. The observed magnetotransport response indicates a spin quantization axis that aligns with the out-of-plane spin quantization axis reported in previous experimental studies. In contrast, the x edge ribbon shows negligible spin splitting under magnetic fields, which is attributed to nonsymmorphic symmetries such as glide mirror and screw rotation, that protects degeneracies along the Gamma X direction, even when time-reversal symmetry is broken. The energy-resolved current density and angular transmission analyses confirm that this anisotropy originates from edge states, while bulk states remain largely insensitive to the field orientation. Our results establish direct transport-spectroscopy based evidence of nonsymmorphic-symmetry-protected spin degeneracy in the 1T WTe2, and underscores its promise for spintronic devices that leverage symmetry-protected and directionally selective transport channels. |
| title | Symmetry driven spin anisotropic magnetotransport in quantum spin Hall insulator WTe2 1T |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.18543 |