Doping dependence of chiral superconductivity in near $45^\circ$ twisted bilayer cuprates
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929198848802816 |
|---|---|
| author | Bélanger, Mathieu Sénéchal, David |
| author_facet | Bélanger, Mathieu Sénéchal, David |
| contents | We study a one-band Hubbard model for a twisted cuprate bilayer with a twist angle of 43.6$^\circ$ and a moire cell containing 58 sites. We use the variational cluster approximation (VCA), which treats short-range correlations exactly and leads, in single layers, to a dome of d-wave superconductivity away from half-filling from strong on-site repulsion alone. We find a time-reversal-symmetry (TRS) breaking phase in a small doping interval in the overdoped region when interlayer tunneling is strong enough. Contrary to expectations, being closer to the $45^{\circ}$ twist angle does not expand this TRS region compared to a previous study [Phys. Rev. B 105, 245127 (2022)] on a $53^{\circ}$ twist angle. This is attributed to the fact that the two superconducting states in competition have almost identical nodal structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_05485 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Doping dependence of chiral superconductivity in near $45^\circ$ twisted bilayer cuprates Bélanger, Mathieu Sénéchal, David Strongly Correlated Electrons Superconductivity We study a one-band Hubbard model for a twisted cuprate bilayer with a twist angle of 43.6$^\circ$ and a moire cell containing 58 sites. We use the variational cluster approximation (VCA), which treats short-range correlations exactly and leads, in single layers, to a dome of d-wave superconductivity away from half-filling from strong on-site repulsion alone. We find a time-reversal-symmetry (TRS) breaking phase in a small doping interval in the overdoped region when interlayer tunneling is strong enough. Contrary to expectations, being closer to the $45^{\circ}$ twist angle does not expand this TRS region compared to a previous study [Phys. Rev. B 105, 245127 (2022)] on a $53^{\circ}$ twist angle. This is attributed to the fact that the two superconducting states in competition have almost identical nodal structures. |
| title | Doping dependence of chiral superconductivity in near $45^\circ$ twisted bilayer cuprates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2306.05485 |