Hysteretic Critical State in Coplanar Josephson Junction with Monolayer Graphene Barrier
Artikel i vetenskaplig tidskrift, 2017
Coplanar Al/graphene/Al junctions fabricated on the same graphene sheet deposited on silicon carbide (SiC), show robust Josephson coupling at subKelvin temperature, when the separations between the electrodes is below 400 nm. Remarkably, a hysteretic Critical State sets in when ramping an orthogonal magnetic field, with a sudden collapse of the Josephson critical current I (c) when turning the field on, and a revival of I (c) when inverting the sweep. Similar hysteresis can be found in granular superconducting films which may undergo the Berezinskii-Kosterlitz-Thouless transition. Here, we give quantitative arguments to prove that this odd behavior of the magnetoconductance gives evidence for an incipient Berezinskii-Kosterlitz-Thouless transition with drift and pinning of fluctuating free vortices induced by the current bias.
Josephson effect
Graphene
Silicon carbide
Författare
D. Massarotti
Università degli Studi della Campania Luigi Vanvitelli
Superconductors, oxides and other innovative materials and devices
B. Jouault
Laboratoire Charles Coulomb
V. Rouco
Universita degli Studi di Napoli Federico II
G. Campagnano
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
D. Giuliano
Istituto Nazionale di Fisica Nucleare
Università della Calabria
P. Lucignano
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
D. Stornaiuolo
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
G. P. Pepe
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
F. Tafuri
Superconductors, oxides and other innovative materials and devices
Università degli Studi della Campania Luigi Vanvitelli
A. Tagliacozzo
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
Istituto Nazionale di Fisica Nucleare
Journal of Superconductivity and Novel Magnetism
1557-1939 (ISSN) 1557-1947 (eISSN)
Vol. 30 1 5-14Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Ämneskategorier
Nanoteknik
Den kondenserade materiens fysik
DOI
10.1007/s10948-016-3871-x