Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe$_2$
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866908621468598272 |
|---|---|
| author | Tuo, Chuyi Li, Ming-Rui Wu, Zhengzhi Sun, Wen Yao, Hong |
| author_facet | Tuo, Chuyi Li, Ming-Rui Wu, Zhengzhi Sun, Wen Yao, Hong |
| contents | Since the very recent discovery of unconventional superconductivity in twisted WSe$_2$ homobilayers at filling $ν=-1$, considerable interest has arisen in revealing its mechanism. In this paper, we developed a three-band tight-binding model with non-trivial band topology by direct Wannierization of the low-energy continuum model. Incorporating both onsite Hubbard repulsion and next-nearest-neighbor attraction, we then performed a mean-field analysis of the microscopic model and obtained a phase diagram qualitatively consistent with the experiment results. For zero or weak displacement field, the ground state is a Chern number $C=\pm 2$ topological superconductor in the Altland-Zirnbauer A-class (breaking time-reversal but preserving total $S_z$ symmetry) with inter-valley pairing dominant in $d_{xy}\pm id_{x^2-y^2}$-wave (mixing with a subdominant $p_x\mp i p_y$-wave) component. For a relatively strong displacement field, the ground state is a correlated insulator with the $120^\circ$ antiferromagnetic order. Our results provide new insights into the nature of the twisted WSe$_2$ systems and suggest the need for further theoretical and experimental explorations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_06779 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe$_2$ Tuo, Chuyi Li, Ming-Rui Wu, Zhengzhi Sun, Wen Yao, Hong Strongly Correlated Electrons Superconductivity Since the very recent discovery of unconventional superconductivity in twisted WSe$_2$ homobilayers at filling $ν=-1$, considerable interest has arisen in revealing its mechanism. In this paper, we developed a three-band tight-binding model with non-trivial band topology by direct Wannierization of the low-energy continuum model. Incorporating both onsite Hubbard repulsion and next-nearest-neighbor attraction, we then performed a mean-field analysis of the microscopic model and obtained a phase diagram qualitatively consistent with the experiment results. For zero or weak displacement field, the ground state is a Chern number $C=\pm 2$ topological superconductor in the Altland-Zirnbauer A-class (breaking time-reversal but preserving total $S_z$ symmetry) with inter-valley pairing dominant in $d_{xy}\pm id_{x^2-y^2}$-wave (mixing with a subdominant $p_x\mp i p_y$-wave) component. For a relatively strong displacement field, the ground state is a correlated insulator with the $120^\circ$ antiferromagnetic order. Our results provide new insights into the nature of the twisted WSe$_2$ systems and suggest the need for further theoretical and experimental explorations. |
| title | Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe$_2$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2409.06779 |