Transverse spin photocurrents in ultrathin topological insulator films
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917906920505344 |
|---|---|
| author | Movafagh, Shahrzad Nikolic, Predrag |
| author_facet | Movafagh, Shahrzad Nikolic, Predrag |
| contents | Nonlinear helicity-dependent photocurrents have been reported in 3D topological materials lacking inversion symmetry. Here, we theoretically study the charge and spin photocurrents generated by linear and circularly polarized radiation in ultrathin topological insulator films. Using time-dependent perturbation theory and detailed balance equations, we find that helical transverse spin currents are generated when the symmetry between the top and bottom film surfaces is disturbed. Such spin currents are invariant under in-plane mirror transformations but have $s$-wave and $d$-wave components in regard to transformations under $π/2$ rotations. Spin current photo-transistors and amplifiers can be based on these effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18547 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Transverse spin photocurrents in ultrathin topological insulator films Movafagh, Shahrzad Nikolic, Predrag Mesoscale and Nanoscale Physics Other Condensed Matter Nonlinear helicity-dependent photocurrents have been reported in 3D topological materials lacking inversion symmetry. Here, we theoretically study the charge and spin photocurrents generated by linear and circularly polarized radiation in ultrathin topological insulator films. Using time-dependent perturbation theory and detailed balance equations, we find that helical transverse spin currents are generated when the symmetry between the top and bottom film surfaces is disturbed. Such spin currents are invariant under in-plane mirror transformations but have $s$-wave and $d$-wave components in regard to transformations under $π/2$ rotations. Spin current photo-transistors and amplifiers can be based on these effects. |
| title | Transverse spin photocurrents in ultrathin topological insulator films |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2501.18547 |