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- Title
Reconstruction-Induced φ 0 Josephson Effect in Quantum Spin Hall Constrictions.
- Authors
Vigliotti, Lucia; Cavaliere, Fabio; Passetti, Giacomo; Sassetti, Maura; Traverso Ziani, Niccolò
- Abstract
The simultaneous breaking of time-reversal and inversion symmetry, in connection to superconductivity, leads to transport properties with disrupting scientific and technological potential. Indeed, the anomalous Josephson effect and the superconducting-diode effect hold promises to enlarge the technological applications of superconductors and nanostructures in general. In this context, the system we theoretically analyze is a Josephson junction (JJ) with coupled reconstructed topological channels as a link; such channels are at the edges of a two-dimensional topological insulator (2DTI). We find a robust φ 0 Josephson effect without requiring the presence of external magnetic fields. Our results, which rely on a fully analytical analysis, are substantiated by means of symmetry arguments: Our system breaks both time-reversal symmetry and inversion symmetry. Moreover, the anomalous current increases as a function of temperature. We interpret this surprising temperature dependence by means of simple qualitative arguments based on Fermi's golden rule.
- Subjects
QUANTUM spin Hall effect; JOSEPHSON effect; JOSEPHSON junctions; TOPOLOGICAL insulators
- Publication
Nanomaterials (2079-4991), 2023, Vol 13, Issue 9, p1497
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano13091497