Proximity-Induced Superconductivity at Non-Helical Topological Insulator Interfaces
| Autor: | David J. Alspaugh, Daniel E. Sheehy, Mahmoud M. Asmar, Ilya Vekhter |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Spins Plane (geometry) Condensed Matter - Superconductivity Rotational symmetry Boundary (topology) FOS: Physical sciences Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Topological insulator 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Spin-½ |
| DOI: | 10.48550/arxiv.1807.04841 |
| Popis: | We study how non-helical spin textures at the boundary between a topological insulator (TI) and a superconductor (SC) affect the proximity-induced superconductivity of the TI interface state. We consider TIs coupled to both spin-singlet and spin-triplet SCs, and show that for the spin-triplet parent SCs the resulting order parameter induced onto the interface state sensitively depends on the symmetries which are broken at the TI-SC boundary. For chiral spin-triplet parent SCs, we find that nodal proximity-induced superconductivity emerges when there is broken twofold rotational symmetry which forces the spins of the non-helical topological states to tilt away from the interface plane. We furthermore show that the Andreev conductance of lateral heterostructures joining TI-vacuum and TI-SC interfaces yields experimental signatures of the reduced symmetries of the interface states. Comment: 5 pages, 2 figures |
| Databáze: | OpenAIRE |
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