Circular THz ratchets in a 2D-modulated Dirac system
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866911784942698496 |
|---|---|
| author | Hild, M. Yahniuk, I. Golub, L. E. Amann, J. Eroms, J. Weiss, D. Watanabe, K. Taniguchi, T. Ganichev, S. D. |
| author_facet | Hild, M. Yahniuk, I. Golub, L. E. Amann, J. Eroms, J. Weiss, D. Watanabe, K. Taniguchi, T. Ganichev, S. D. |
| contents | We report on the observation of the circular ratchet effect excited by terahertz laser radiation in a specially designed two-dimensional metamaterial consisting of a graphene monolayer deposited on a graphite gate patterned with an array of triangular antidots. We show that a periodically driven Dirac fermion system with spatial asymmetry converts the a.c. power into a d.c. current, whose direction reverses when the radiation helicity is switched. The circular ratchet effect is demonstrated for room temperature and a radiation frequency of 2.54 THz. It is shown that the ratchet current magnitude can be controllably tuned by the patterned and uniform back gate voltages. The results are analyzed in the light of the developed microscopic theory considering electronic and plasmonic mechanisms of the ratchet current formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17540 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Circular THz ratchets in a 2D-modulated Dirac system Hild, M. Yahniuk, I. Golub, L. E. Amann, J. Eroms, J. Weiss, D. Watanabe, K. Taniguchi, T. Ganichev, S. D. Mesoscale and Nanoscale Physics We report on the observation of the circular ratchet effect excited by terahertz laser radiation in a specially designed two-dimensional metamaterial consisting of a graphene monolayer deposited on a graphite gate patterned with an array of triangular antidots. We show that a periodically driven Dirac fermion system with spatial asymmetry converts the a.c. power into a d.c. current, whose direction reverses when the radiation helicity is switched. The circular ratchet effect is demonstrated for room temperature and a radiation frequency of 2.54 THz. It is shown that the ratchet current magnitude can be controllably tuned by the patterned and uniform back gate voltages. The results are analyzed in the light of the developed microscopic theory considering electronic and plasmonic mechanisms of the ratchet current formation. |
| title | Circular THz ratchets in a 2D-modulated Dirac system |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2402.17540 |