Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide
Hybrid structures between conventional, s-wave superconductors, and two-dimensional topological insulators (2D TIs) are a promising route to topological superconductivity. Here, we investigate planar Josephson junctions fabricated from hybrid structures that use thin films of cadmium arsenide (Cd3As...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2023-04-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0145067 |
| _version_ | 1797771849273180160 |
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| author | Arman Rashidi Robert Kealhofer Alexander C. Lygo Victor Huang Susanne Stemmer |
| author_facet | Arman Rashidi Robert Kealhofer Alexander C. Lygo Victor Huang Susanne Stemmer |
| author_sort | Arman Rashidi |
| collection | DOAJ |
| description | Hybrid structures between conventional, s-wave superconductors, and two-dimensional topological insulators (2D TIs) are a promising route to topological superconductivity. Here, we investigate planar Josephson junctions fabricated from hybrid structures that use thin films of cadmium arsenide (Cd3As2) as the 2D TI material. Measurements of superconducting interference patterns in a perpendicular magnetic field are used to extract information about the spatial distribution of the supercurrent. We show that the interference patterns are distinctly different in junctions with and without mesa-isolation. In mesa-defined junctions, the bulk of the 2D TI appears to be almost completely shunted by supercurrent flowing along the edges, whereas the supercurrent is much more uniform across the junction when the Cd3As2 film extends beyond the device. We discuss the possible origins of the observed behaviors. |
| first_indexed | 2024-03-12T21:43:26Z |
| format | Article |
| id | doaj.art-8da19cf1f7e842c696a2094e2bbd15b1 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-03-12T21:43:26Z |
| publishDate | 2023-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-8da19cf1f7e842c696a2094e2bbd15b12023-07-26T14:42:04ZengAIP Publishing LLCAPL Materials2166-532X2023-04-01114041117041117-610.1063/5.0145067Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenideArman Rashidi0Robert Kealhofer1Alexander C. Lygo2Victor Huang3Susanne Stemmer4Materials Department, University of California, Santa Barbara, California 93106-5050, USAMaterials Department, University of California, Santa Barbara, California 93106-5050, USAMaterials Department, University of California, Santa Barbara, California 93106-5050, USAMaterials Department, University of California, Santa Barbara, California 93106-5050, USAMaterials Department, University of California, Santa Barbara, California 93106-5050, USAHybrid structures between conventional, s-wave superconductors, and two-dimensional topological insulators (2D TIs) are a promising route to topological superconductivity. Here, we investigate planar Josephson junctions fabricated from hybrid structures that use thin films of cadmium arsenide (Cd3As2) as the 2D TI material. Measurements of superconducting interference patterns in a perpendicular magnetic field are used to extract information about the spatial distribution of the supercurrent. We show that the interference patterns are distinctly different in junctions with and without mesa-isolation. In mesa-defined junctions, the bulk of the 2D TI appears to be almost completely shunted by supercurrent flowing along the edges, whereas the supercurrent is much more uniform across the junction when the Cd3As2 film extends beyond the device. We discuss the possible origins of the observed behaviors.http://dx.doi.org/10.1063/5.0145067 |
| spellingShingle | Arman Rashidi Robert Kealhofer Alexander C. Lygo Victor Huang Susanne Stemmer Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide APL Materials |
| title | Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide |
| title_full | Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide |
| title_fullStr | Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide |
| title_full_unstemmed | Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide |
| title_short | Induced superconductivity in the two-dimensional topological insulator phase of cadmium arsenide |
| title_sort | induced superconductivity in the two dimensional topological insulator phase of cadmium arsenide |
| url | http://dx.doi.org/10.1063/5.0145067 |
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