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Current-phase relation of a short multi-mode Bi2Se3 topological insulator nanoribbon Josephson junction with ballistic transport modes

Authors :
Surendran, Ananthu P.
Montemurro, Domenico
Kunakova, Gunta
Palermo, Xavier
Niherysh, Kiryl
trabaldo, Edoardo
Golubev, Dmitry
Andzane, Jana
Erts, Donats
Lombardi, Floriana
Bauch, Thilo
Source :
Supercond. Sci. Technol. 36 064003, 2023
Publication Year :
2023

Abstract

We used the asymmetric superconducting quantum interference device (SQUID) technique to extract the current phase relation (CPR) of a Josephson junction with a 3D-topological insulator (TI) Bi2Se3 nanobelt as the barrier. The obtained CPR shows deviations from the standard sinusoidal CPR with a pronounced forward skewness. At temperatures below 200 mK, the junction skewness values are above the zero temperature limit for short diffusive junctions. Fitting of the extracted CPR shows that most of the supercurrent is carried by ballistic topological surface states (TSSs), with a small contribution of diffusive channels primarily due to the bulk. These findings are instrumental in engineering devices that can fully exploit the properties of the topologically protected surface states of 3D TIs.

Details

Database :
arXiv
Journal :
Supercond. Sci. Technol. 36 064003, 2023
Publication Type :
Report
Accession number :
edsarx.2304.12116
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/1361-6668/accf40