4π-periodic AC Josephson current through a reconstructed quantum spin Hall constriction

Vigliotti, L. (2022) 4π-periodic AC Josephson current through a reconstructed quantum spin Hall constriction. Il nuovo cimento C, 45 (4). pp. 1-11. ISSN 1826-9885

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Abstract

We consider a Josephson junction based on a long constriction between the helical edges of a two-dimensional topological insulator, tunnel-coupled to two superconductors, pierced by a magnetic flux, and subjected to an external bias. We analyse the general case of a reconstructed constriction; namely, the two direction-conserving tunnel couplings may have different intensities. We show that our model, as in the absence of edge reconstruction, admits the occurrence of a 4π-periodic component in the AC Josephson current as a function of the magnetic flux. Such feature is robust in a wide range of parameters. A detailed discussion on the temperature dependence is also provided.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	06 Sep 2022 11:30
Last Modified:	06 Sep 2022 11:30
URI:	http://eprints.bice.rm.cnr.it/id/eprint/21980

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