Observation of excitons bound by antiferromagnetic correlations
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866915279034908672 |
|---|---|
| author | Mehio, Omar Han, Yuchen Li, Xinwei Ning, Honglie Porter, Zach Wilson, Stephen D. Hsieh, David |
| author_facet | Mehio, Omar Han, Yuchen Li, Xinwei Ning, Honglie Porter, Zach Wilson, Stephen D. Hsieh, David |
| contents | Two-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated binding mechanism remains elusive. Leveraging the distinct magnetic critical properties of the Mott antiferromagnets Sr$_2$IrO$_4$ and Sr$_3$Ir$_2$O$_7$, we show using time-resolved THz spectroscopy that excitons only exist at temperatures below where short-range AFM correlation develops. The excitons remain stable up to photodoping densities approaching the predicted excitonic Mott insulator-to-metal transition, revealing a unique robustness against screening. Our results establish the viability of spin-bound excitons and introduce opportunities for excitonic control through magnetic degrees of freedom. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05565 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of excitons bound by antiferromagnetic correlations Mehio, Omar Han, Yuchen Li, Xinwei Ning, Honglie Porter, Zach Wilson, Stephen D. Hsieh, David Strongly Correlated Electrons Two-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated binding mechanism remains elusive. Leveraging the distinct magnetic critical properties of the Mott antiferromagnets Sr$_2$IrO$_4$ and Sr$_3$Ir$_2$O$_7$, we show using time-resolved THz spectroscopy that excitons only exist at temperatures below where short-range AFM correlation develops. The excitons remain stable up to photodoping densities approaching the predicted excitonic Mott insulator-to-metal transition, revealing a unique robustness against screening. Our results establish the viability of spin-bound excitons and introduce opportunities for excitonic control through magnetic degrees of freedom. |
| title | Observation of excitons bound by antiferromagnetic correlations |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.05565 |