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Reconstruction-Induced $\varphi_0$ Josephson Effect in Quantum Spin Hall Constrictions
- Source :
- Nanomaterials 2023, 13(9), 1497
- Publication Year :
- 2023
-
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 $\varphi_0$ 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.<br />Comment: 13 pages, 3 figures
Details
- Database :
- arXiv
- Journal :
- Nanomaterials 2023, 13(9), 1497
- Publication Type :
- Report
- Accession number :
- edsarx.2305.01003
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3390/nano13091497