In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe$_2$ homobilayers
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915419276705792 |
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| author | Zhu, Jihang Chou, Yang-Zhi Huang, Yi Sarma, Sankar Das |
| author_facet | Zhu, Jihang Chou, Yang-Zhi Huang, Yi Sarma, Sankar Das |
| contents | We theoretically predict the in-plane magnetic field-induced orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting states in twisted WSe$_2$ homobilayers (tWSe$_2$), focusing on its dependence on layer polarization and Fermi surface geometry. For unpolarized layers, finite-momentum pairing emerges only at low temperatures and above a critical field $B_{c1,\parallel}$. When layer symmetry is broken, finite-momentum pairing is stabilized at any nonzero field, with a critical temperature higher than that of the zero-momentum state. Notably, we identify a phase transition, which separates two distinct FFLO phases, when there are two separate Fermi pockets residing in the two moiré mini-valleys associated with opposite layers. We further discuss the effects of twist angles and applied field directions. Our findings establish tWSe$_2$ as a promising platform for realizing and manipulating FFLO states via twist angle, displacement field, and filling factor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18946 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe$_2$ homobilayers Zhu, Jihang Chou, Yang-Zhi Huang, Yi Sarma, Sankar Das Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons We theoretically predict the in-plane magnetic field-induced orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting states in twisted WSe$_2$ homobilayers (tWSe$_2$), focusing on its dependence on layer polarization and Fermi surface geometry. For unpolarized layers, finite-momentum pairing emerges only at low temperatures and above a critical field $B_{c1,\parallel}$. When layer symmetry is broken, finite-momentum pairing is stabilized at any nonzero field, with a critical temperature higher than that of the zero-momentum state. Notably, we identify a phase transition, which separates two distinct FFLO phases, when there are two separate Fermi pockets residing in the two moiré mini-valleys associated with opposite layers. We further discuss the effects of twist angles and applied field directions. Our findings establish tWSe$_2$ as a promising platform for realizing and manipulating FFLO states via twist angle, displacement field, and filling factor. |
| title | In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe$_2$ homobilayers |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.18946 |