Negative transit time in non-tunneling electron transmission through graphene multilayers
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866908398021246976 |
|---|---|
| author | Krasovskii, E. E. Kuzian, R. O. |
| author_facet | Krasovskii, E. E. Kuzian, R. O. |
| contents | Attosecond dynamics of electron transmission through atomically-thin crystalline films is studied with an {\em ab initio} scattering theory. The temporal character of the electron propagation through graphene multilayers is traced to the band structure of bulk graphite: In the forbidden gaps the wave packet transit time $τ_\mathrm{T}$ saturates with thickness and in the allowed bands $τ_\mathrm{T}$ oscillates following transmission resonances. Hitherto unknown negative transit time due to in-plane scattering is discovered in monolayers of graphene, h-BN, and oxygen. Moreover, Wigner time delay is found to diverge at the scattering resonances caused by the emergence of secondary diffracted beams. This offers a way to manipulate the propagation timing of the wave packet without sacrificing the transmitted intensity. The spatial reshaping of the wave packet at the resonances may help elucidate details of the streaking by an inhomogeneous field at the surface. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_19440 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Negative transit time in non-tunneling electron transmission through graphene multilayers Krasovskii, E. E. Kuzian, R. O. Materials Science Computational Physics Optics Quantum Physics Attosecond dynamics of electron transmission through atomically-thin crystalline films is studied with an {\em ab initio} scattering theory. The temporal character of the electron propagation through graphene multilayers is traced to the band structure of bulk graphite: In the forbidden gaps the wave packet transit time $τ_\mathrm{T}$ saturates with thickness and in the allowed bands $τ_\mathrm{T}$ oscillates following transmission resonances. Hitherto unknown negative transit time due to in-plane scattering is discovered in monolayers of graphene, h-BN, and oxygen. Moreover, Wigner time delay is found to diverge at the scattering resonances caused by the emergence of secondary diffracted beams. This offers a way to manipulate the propagation timing of the wave packet without sacrificing the transmitted intensity. The spatial reshaping of the wave packet at the resonances may help elucidate details of the streaking by an inhomogeneous field at the surface. |
| title | Negative transit time in non-tunneling electron transmission through graphene multilayers |
| topic | Materials Science Computational Physics Optics Quantum Physics |
| url | https://arxiv.org/abs/2404.19440 |