Current-phase relation of a short multi-mode Bi2 Se3 topological insulator nanoribbon Josephson junction with ballistic transport modes
Journal article, 2023
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 (3D-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.
topological insulator
Josephson junction
SQUID
current phase relation
Author
Ananthu Pullukattuthara Surendran
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Domenico Montemurro
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
University of Naples Federico II
Gunta Kunakova
University of Latvia
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Xavier Palermo
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Kiryl Niherysh
University of Latvia
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Edoardo Trabaldo
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Dmitry Golubev
Aalto University
J. Andzane
University of Latvia
Donats Érts
University of Latvia
Floriana Lombardi
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Thilo Bauch
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Superconductor Science and Technology
0953-2048 (ISSN) 1361-6668 (eISSN)
Vol. 36 6 064003High Frequency Topological Insulator devices for Metrology (HiTIMe)
European Commission (EC) (EC/H2020/766714), 2018-02-01 -- 2022-01-31.
QUantum Electronics Science and TECHnology training (QuESTech)
European Commission (EC) (EC/H2020/766025), 2018-01-01 -- 2021-12-31.
Subject Categories
Condensed Matter Physics
DOI
10.1088/1361-6668/accf40