Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.02654 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911942457688064 |
|---|---|
| author | Choi, Young Woo Ihm, Jisoon Cohen, Marvin L. |
| author_facet | Choi, Young Woo Ihm, Jisoon Cohen, Marvin L. |
| contents | We investigate the properties of the recently observed "demon" mode, a 3D acoustic plasmon, in Sr$_2$RuO$_4$ with an emphasis on evaluating its role for the pairing interactions in this superconductor. The demon mode is a low-energy electronic excitation, and it has been suggested that it could contribute to a reduced Coulomb repulsion and even a possible attractive interaction between electrons. In this study, we explicitly calculate the dynamically screened Coulomb interaction for Sr$_2$RuO$_4$ by using a renormalized tight-binding band structure and the random phase approximation for the dielectric function. Although the focus here is on Sr$_2$RuO$_4$, this material is considered mainly as a prototype system, having an observed demon mode, and our results should be considered as a guide for application to other systems. Our calculations show that there are regions in ($\mathbf{q}$, $ω$) space where the Coulomb interaction becomes attractive. We find that, although the demon mode is not capable of producing a total attractive electron pairing interaction in Sr$_2$RuO$_4$, it does contribute to a significant reduction in the Coulomb repulsion at the relevant pairing energy scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02654 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pairing interaction from Demons in Sr$_2$RuO$_4$ Choi, Young Woo Ihm, Jisoon Cohen, Marvin L. Superconductivity We investigate the properties of the recently observed "demon" mode, a 3D acoustic plasmon, in Sr$_2$RuO$_4$ with an emphasis on evaluating its role for the pairing interactions in this superconductor. The demon mode is a low-energy electronic excitation, and it has been suggested that it could contribute to a reduced Coulomb repulsion and even a possible attractive interaction between electrons. In this study, we explicitly calculate the dynamically screened Coulomb interaction for Sr$_2$RuO$_4$ by using a renormalized tight-binding band structure and the random phase approximation for the dielectric function. Although the focus here is on Sr$_2$RuO$_4$, this material is considered mainly as a prototype system, having an observed demon mode, and our results should be considered as a guide for application to other systems. Our calculations show that there are regions in ($\mathbf{q}$, $ω$) space where the Coulomb interaction becomes attractive. We find that, although the demon mode is not capable of producing a total attractive electron pairing interaction in Sr$_2$RuO$_4$, it does contribute to a significant reduction in the Coulomb repulsion at the relevant pairing energy scale. |
| title | Pairing interaction from Demons in Sr$_2$RuO$_4$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2407.02654 |