Dimensionality-Dependent Exciton Dispersion in a Single-Band Mott Insulator
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866918406089867264 |
|---|---|
| author | Su, Zhibin Mi, Junjian Yan, Shaohua Li, Jiade Xue, Siwei Tao, Zhiyu Wang, Enling Shi, Xiongfei Lei, Hechang Xu, Zhuan Guo, Jiandong Zhu, Xuetao |
| author_facet | Su, Zhibin Mi, Junjian Yan, Shaohua Li, Jiade Xue, Siwei Tao, Zhiyu Wang, Enling Shi, Xiongfei Lei, Hechang Xu, Zhuan Guo, Jiandong Zhu, Xuetao |
| contents | Excitonic band structure is critical for investigating exciton dynamics. Theoretically, quantum effects from exchange scattering between electron-hole pairs significantly modulate exciton dispersion. Here, we report the direct observation of dimensionality-dependent exciton dispersion in a single-band Mott insulator Nb3Cl8 through high-resolution electron energy loss spectroscopy. In the high-temperature phase, the exciton in Nb3Cl8 hosts an exceptionally large binding energy, and exhibits clear quasi-two-dimensional massless linear dispersion. In contrast, in the low-temperature phase, the exciton splits into two bands, both displaying three-dimensional parabolic dispersion. These dramatic changes in the exciton dispersion stem from the dimensional mutation driven by a substantial enhancement of interlayer coupling across the phase transition. This Letter provides a clear and typical example of how exciton behavior evolves with dimensionality. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22695 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dimensionality-Dependent Exciton Dispersion in a Single-Band Mott Insulator Su, Zhibin Mi, Junjian Yan, Shaohua Li, Jiade Xue, Siwei Tao, Zhiyu Wang, Enling Shi, Xiongfei Lei, Hechang Xu, Zhuan Guo, Jiandong Zhu, Xuetao Strongly Correlated Electrons Materials Science Excitonic band structure is critical for investigating exciton dynamics. Theoretically, quantum effects from exchange scattering between electron-hole pairs significantly modulate exciton dispersion. Here, we report the direct observation of dimensionality-dependent exciton dispersion in a single-band Mott insulator Nb3Cl8 through high-resolution electron energy loss spectroscopy. In the high-temperature phase, the exciton in Nb3Cl8 hosts an exceptionally large binding energy, and exhibits clear quasi-two-dimensional massless linear dispersion. In contrast, in the low-temperature phase, the exciton splits into two bands, both displaying three-dimensional parabolic dispersion. These dramatic changes in the exciton dispersion stem from the dimensional mutation driven by a substantial enhancement of interlayer coupling across the phase transition. This Letter provides a clear and typical example of how exciton behavior evolves with dimensionality. |
| title | Dimensionality-Dependent Exciton Dispersion in a Single-Band Mott Insulator |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2603.22695 |