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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.16757 |
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| _version_ | 1866913364220837888 |
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| author | Sakaguchi, Tatsuro Takane, Yositake |
| author_facet | Sakaguchi, Tatsuro Takane, Yositake |
| contents | In a three-dimensional strong topological insulator, gapless helical surface states appear everywhere on its surface. In the presence of a screw dislocation, gapless helical modes also appear in the vicinity of the corresponding dislocation line. Let us focus on a case where a pair of screw dislocations connects the top and bottom surfaces of a strong topological insulator with a shape of rectangular parallelepiped. The dislocation-induced helical modes are expected to act as one-dimensional conduction channels connecting the top and bottom surfaces. To examine this expectation, we calculate the two-terminal conductance between a pair of electrodes placed on the top and bottom surfaces. We found that the dislocation-induced helical modes and the helical surface states on the side surface contribute to the two-terminal conductance. The contribution of the dislocation-induced helical modes becomes more dominant than that of the helical surface states in certain situations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_16757 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electron Transport along Screw Dislocations in a Strong Topological Insulator Sakaguchi, Tatsuro Takane, Yositake Mesoscale and Nanoscale Physics In a three-dimensional strong topological insulator, gapless helical surface states appear everywhere on its surface. In the presence of a screw dislocation, gapless helical modes also appear in the vicinity of the corresponding dislocation line. Let us focus on a case where a pair of screw dislocations connects the top and bottom surfaces of a strong topological insulator with a shape of rectangular parallelepiped. The dislocation-induced helical modes are expected to act as one-dimensional conduction channels connecting the top and bottom surfaces. To examine this expectation, we calculate the two-terminal conductance between a pair of electrodes placed on the top and bottom surfaces. We found that the dislocation-induced helical modes and the helical surface states on the side surface contribute to the two-terminal conductance. The contribution of the dislocation-induced helical modes becomes more dominant than that of the helical surface states in certain situations. |
| title | Electron Transport along Screw Dislocations in a Strong Topological Insulator |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.16757 |