Topological insulator nanoribbon Josephson junctions: Evidence for size effects in transport properties
Artikel i vetenskaplig tidskrift, 2020

We have used Bi 2 Se 3 nanoribbons, grown by catalyst-free physical vapor deposition to fabricate high quality Josephson junctions with Al superconducting electrodes. In our devices, we observe a pronounced reduction of the Josephson critical current density J c by reducing the width of the junction, which in our case corresponds to the width of the nanoribbon. Because the topological surface states extend over the entire circumference of the nanoribbon, the superconducting transport associated with them is carried by modes on both the top and bottom surfaces of the nanoribbon. We show that the J c reduction as a function of the nanoribbon width can be accounted for by assuming that only the modes traveling on the top surface contribute to the Josephson transport as we derive by geometrical consideration. This finding is of great relevance for topological quantum circuitry schemes since it indicates that the Josephson current is mainly carried by the topological surface states.

Författare

Gunta Kunakova

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Latvijas Universitate

Ananthu Pullukattuthara Surendran

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Domenico Montemurro

Universita degli Studi di Napoli Federico II

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Matteo Salvato

Universita degli Studi di Roma Tor Vergata

Dmitry Golubev

Aalto-Yliopisto

J. Andzane

Latvijas Universitate

Donats Érts

Latvijas Universitate

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Journal of Applied Physics

0021-8979 (ISSN) 1089-7550 (eISSN)

Vol. 128 19 194304

Ämneskategorier

Annan fysik

Fusion, plasma och rymdfysik

Den kondenserade materiens fysik

DOI

10.1063/5.0022126

Mer information

Senast uppdaterat

2021-02-25