Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912835389358080 |
|---|---|
| author | Talkington, Spenser Mele, Eugene J. |
| author_facet | Talkington, Spenser Mele, Eugene J. |
| contents | We report calculations of terahertz ellipticities in large-angle, 21.79$^\circ$ and 38.21$^\circ$, commensurate twisted bilayer graphene, and predict values as high as 1.5 millidegrees in the terahertz region for this non-magnetic material. This terahertz circular dichroism exhibits a magnitude comparable to that of chiral materials in the visible region. At low frequencies, the dichroic response is mediated by strong interlayer hybridization, which allows us to probe the symmetry and strength of these couplings. Crucially, lateral interlayer translation tunes this response, in contrast to small twist angle bilayer graphene's near invariance under under interlayer translation. We examine the magnitude and phase of the interlayer coupling for all structures containing fewer than 400 atoms per unit cell. Finally, we find that the dichroism can be manipulated by applying an electric field or with doping. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_14472 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene Talkington, Spenser Mele, Eugene J. Mesoscale and Nanoscale Physics We report calculations of terahertz ellipticities in large-angle, 21.79$^\circ$ and 38.21$^\circ$, commensurate twisted bilayer graphene, and predict values as high as 1.5 millidegrees in the terahertz region for this non-magnetic material. This terahertz circular dichroism exhibits a magnitude comparable to that of chiral materials in the visible region. At low frequencies, the dichroic response is mediated by strong interlayer hybridization, which allows us to probe the symmetry and strength of these couplings. Crucially, lateral interlayer translation tunes this response, in contrast to small twist angle bilayer graphene's near invariance under under interlayer translation. We examine the magnitude and phase of the interlayer coupling for all structures containing fewer than 400 atoms per unit cell. Finally, we find that the dichroism can be manipulated by applying an electric field or with doping. |
| title | Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2305.14472 |