Superconductivity in twisted bilayer WSe$_2$
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866915116826492928 |
|---|---|
| author | Guo, Yinjie Pack, Jordan Swann, Joshua Holtzman, Luke Cothrine, Matthew Watanabe, Kenji Taniguchi, Takashi Mandrus, David Barmak, Katayun Hone, James Millis, Andrew J. Pasupathy, Abhay N. Dean, Cory R. |
| author_facet | Guo, Yinjie Pack, Jordan Swann, Joshua Holtzman, Luke Cothrine, Matthew Watanabe, Kenji Taniguchi, Takashi Mandrus, David Barmak, Katayun Hone, James Millis, Andrew J. Pasupathy, Abhay N. Dean, Cory R. |
| contents | The discovery of superconductivity in twisted bilayer and twisted trilayer graphene has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Flat bands can also be induced by moiré patterns in lattice-mismatched and or twisted heterostructures of other two-dimensional materials such as transition metal dichalcogenides (TMDs). Although a wide range of correlated phenomenon have indeed been observed in the moiré TMDs, robust demonstration of superconductivity has remained absent. Here we report superconductivity in 5 degree twisted bilayer WSe$_2$ (tWSe$_2$) with a maximum critical temperature of 426 mK. The superconducting state appears in a limited region of displacement field and density that is adjacent to a metallic state with Fermi surface reconstruction believed to arise from antiferromagnetic order. A sharp boundary is observed between the superconducting and magnetic phases at low temperature, reminiscent of spin-fluctuation mediated superconductivity. Our results establish that moiré flat-band superconductivity extends beyond graphene structures. Material properties that are absent in graphene but intrinsic among the TMDs such as a native band gap, large spin-orbit coupling, spin-valley locking, and magnetism offer the possibility to access a broader superconducting parameter space than graphene-only structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03418 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductivity in twisted bilayer WSe$_2$ Guo, Yinjie Pack, Jordan Swann, Joshua Holtzman, Luke Cothrine, Matthew Watanabe, Kenji Taniguchi, Takashi Mandrus, David Barmak, Katayun Hone, James Millis, Andrew J. Pasupathy, Abhay N. Dean, Cory R. Mesoscale and Nanoscale Physics Strongly Correlated Electrons Superconductivity The discovery of superconductivity in twisted bilayer and twisted trilayer graphene has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Flat bands can also be induced by moiré patterns in lattice-mismatched and or twisted heterostructures of other two-dimensional materials such as transition metal dichalcogenides (TMDs). Although a wide range of correlated phenomenon have indeed been observed in the moiré TMDs, robust demonstration of superconductivity has remained absent. Here we report superconductivity in 5 degree twisted bilayer WSe$_2$ (tWSe$_2$) with a maximum critical temperature of 426 mK. The superconducting state appears in a limited region of displacement field and density that is adjacent to a metallic state with Fermi surface reconstruction believed to arise from antiferromagnetic order. A sharp boundary is observed between the superconducting and magnetic phases at low temperature, reminiscent of spin-fluctuation mediated superconductivity. Our results establish that moiré flat-band superconductivity extends beyond graphene structures. Material properties that are absent in graphene but intrinsic among the TMDs such as a native band gap, large spin-orbit coupling, spin-valley locking, and magnetism offer the possibility to access a broader superconducting parameter space than graphene-only structures. |
| title | Superconductivity in twisted bilayer WSe$_2$ |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2406.03418 |