Anomalous acoustic plasmons in two-dimensional over-tilted Dirac bands
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2022
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866915918074871808 |
|---|---|
| author | Yan, Chang-Xu Zhang, Furu Tan, Chao-Yang Chang, Hao-Ran Zhou, Jianhui Yao, Yugui |
| author_facet | Yan, Chang-Xu Zhang, Furu Tan, Chao-Yang Chang, Hao-Ran Zhou, Jianhui Yao, Yugui |
| contents | The over-tilting of Dirac cones has led to various fascinating quantum phenomena. Here we find that two anomalous acoustic plasmons (AAPs) are dictated by the distinct geometry of two-dimensional (2D) type-II Dirac cones, far beyond the conventional $\sqrt{q}$ plasmon. One AAP originates from the strong hybridization of two pockets with large velocity anisotropy at one Dirac point, whereas the other is attributed to the significant enhancement of the band correlation around the open Fermi surface. Remarkably, the plasmons exhibit valley-dependent chirality along the tilting direction due to the chiral electron dispersion. Meanwhile, we discuss the tunability of plasmon dispersion and lifetime by tuning the gap and dielectric substrate. Our work provides a promising way to generate the novel plasmons in Dirac materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_11266 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Anomalous acoustic plasmons in two-dimensional over-tilted Dirac bands Yan, Chang-Xu Zhang, Furu Tan, Chao-Yang Chang, Hao-Ran Zhou, Jianhui Yao, Yugui Mesoscale and Nanoscale Physics The over-tilting of Dirac cones has led to various fascinating quantum phenomena. Here we find that two anomalous acoustic plasmons (AAPs) are dictated by the distinct geometry of two-dimensional (2D) type-II Dirac cones, far beyond the conventional $\sqrt{q}$ plasmon. One AAP originates from the strong hybridization of two pockets with large velocity anisotropy at one Dirac point, whereas the other is attributed to the significant enhancement of the band correlation around the open Fermi surface. Remarkably, the plasmons exhibit valley-dependent chirality along the tilting direction due to the chiral electron dispersion. Meanwhile, we discuss the tunability of plasmon dispersion and lifetime by tuning the gap and dielectric substrate. Our work provides a promising way to generate the novel plasmons in Dirac materials. |
| title | Anomalous acoustic plasmons in two-dimensional over-tilted Dirac bands |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2211.11266 |