期刊
NANOMATERIALS
卷 13, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano13091497
关键词
Josephson junctions; topological insulators; symmetry breaking; phi(0) effect
This study investigates a Josephson junction with coupled reconstructed topological channels, and finds a robust f(0) Josephson effect without the presence of external magnetic fields. The anomalous current increases as a function of temperature. These results have significant implications for the technological applications of superconductors and nanostructures.
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 f(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.
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