2.5-dimensional topological superconductivity in twisted superconducting flakes
Abstract Multilayer flakes of two-dimensional materials were recently shown to be tunable by twisting monolayers on their surface. This raises the question whether qualitatively new phenomena can occur in such finite-thickness moiré systems. Here we demonstrate the emergence of distinct topological...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-024-00719-2 |
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| _version_ | 1832571988170768384 |
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| author | Kevin P. Lucht J. H. Pixley Pavel A. Volkov |
| author_facet | Kevin P. Lucht J. H. Pixley Pavel A. Volkov |
| author_sort | Kevin P. Lucht |
| collection | DOAJ |
| description | Abstract Multilayer flakes of two-dimensional materials were recently shown to be tunable by twisting monolayers on their surface. This raises the question whether qualitatively new phenomena can occur in such finite-thickness moiré systems. Here we demonstrate the emergence of distinct topological phases and transitions in N-layered flakes of nodal superconductors with a single monolayer twisted on top of it. We show that a c-axis current transforms the whole system into a chiral topological superconductor. Increasing the current drives a sequence of topological transitions between states characterized by a Chern number increasing from $$\sim {\mathcal{O}}(N)$$ ~ O ( N ) up to $$\sim {\mathcal{O}}({N}^{2})$$ ~ O ( N 2 ) , well beyond the additive effect of stacking N layers. We predict thickness-independent signatures of these states in the thermal Hall and tunneling microscopy measurements. Twisted superconductor flakes thus provide an example of a “2.5-dimensional” material where the synergy of two-dimensional layers extended in a third dimension realize states inaccessible in either monolayer or bulk materials. |
| format | Article |
| id | doaj-art-34801dea8b4a495fa31c3bc8d0d3c1e0 |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-34801dea8b4a495fa31c3bc8d0d3c1e02025-02-02T12:07:20ZengNature Portfolionpj Quantum Materials2397-46482025-01-0110111110.1038/s41535-024-00719-22.5-dimensional topological superconductivity in twisted superconducting flakesKevin P. Lucht0J. H. Pixley1Pavel A. Volkov2Department of Physics and Astronomy, Center for Materials Theory, Rutgers UniversityDepartment of Physics and Astronomy, Center for Materials Theory, Rutgers UniversityDepartment of Physics and Astronomy, Center for Materials Theory, Rutgers UniversityAbstract Multilayer flakes of two-dimensional materials were recently shown to be tunable by twisting monolayers on their surface. This raises the question whether qualitatively new phenomena can occur in such finite-thickness moiré systems. Here we demonstrate the emergence of distinct topological phases and transitions in N-layered flakes of nodal superconductors with a single monolayer twisted on top of it. We show that a c-axis current transforms the whole system into a chiral topological superconductor. Increasing the current drives a sequence of topological transitions between states characterized by a Chern number increasing from $$\sim {\mathcal{O}}(N)$$ ~ O ( N ) up to $$\sim {\mathcal{O}}({N}^{2})$$ ~ O ( N 2 ) , well beyond the additive effect of stacking N layers. We predict thickness-independent signatures of these states in the thermal Hall and tunneling microscopy measurements. Twisted superconductor flakes thus provide an example of a “2.5-dimensional” material where the synergy of two-dimensional layers extended in a third dimension realize states inaccessible in either monolayer or bulk materials.https://doi.org/10.1038/s41535-024-00719-2 |
| spellingShingle | Kevin P. Lucht J. H. Pixley Pavel A. Volkov 2.5-dimensional topological superconductivity in twisted superconducting flakes npj Quantum Materials |
| title | 2.5-dimensional topological superconductivity in twisted superconducting flakes |
| title_full | 2.5-dimensional topological superconductivity in twisted superconducting flakes |
| title_fullStr | 2.5-dimensional topological superconductivity in twisted superconducting flakes |
| title_full_unstemmed | 2.5-dimensional topological superconductivity in twisted superconducting flakes |
| title_short | 2.5-dimensional topological superconductivity in twisted superconducting flakes |
| title_sort | 2 5 dimensional topological superconductivity in twisted superconducting flakes |
| url | https://doi.org/10.1038/s41535-024-00719-2 |
| work_keys_str_mv | AT kevinplucht 25dimensionaltopologicalsuperconductivityintwistedsuperconductingflakes AT jhpixley 25dimensionaltopologicalsuperconductivityintwistedsuperconductingflakes AT pavelavolkov 25dimensionaltopologicalsuperconductivityintwistedsuperconductingflakes |