Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires
Artikel i vetenskaplig tidskrift, 2022
Two-dimensional SrTiO3-based interfaces stand out among non-centrosymmetric superconductors due to their intricate interplay of gate-tunable Rashba spin-orbit coupling and multi-orbital electronic occupations, whose combination theoretically prefigures various forms of non-standard superconductivity. By employing superconducting transport measurements in nano-devices we present strong experimental indications of unconventional superconductivity in the LaAlO3/SrTiO3 interface. The central observations are the substantial anomalous enhancement of the critical current by small magnetic fields applied perpendicularly to the plane of electron motion, and the asymmetric response with respect to the magnetic field direction. These features cannot be accommodated within a scenario of canonical spin-singlet superconductivity. We demonstrate that the experimental observations can be described by a theoretical model based on the coexistence of Josephson channels with intrinsic phase shifts. Our results exclude a time-reversal symmetry breaking scenario and suggest the presence of anomalous pairing components that are compatible with inversion symmetry breaking and multi-orbital physics.
Författare
Gyanendra Singh
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Claudio Guarcello
Universita degli Studi di Salerno
Monte Sant’Angelo University
Edouard Lesne
TU Delft
Dag Winkler
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Tord Claeson
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Thilo Bauch
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Andrea D. Caviglia
TU Delft
Roberta Citro
Monte Sant’Angelo University
Universita degli Studi di Salerno
Mario Cuoco
Universita degli Studi di Salerno
Alexei Kalaboukhov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
npj Quantum Materials
23974648 (eISSN)
Vol. 7 1 2Multifunktionella gränsytor i komplexa metalloxider för styrbar elektronik
Vetenskapsrådet (VR) (2016-05256), 2017-01-01 -- 2020-12-31.
Ämneskategorier (SSIF 2011)
Annan fysik
Fusion, plasma och rymdfysik
Den kondenserade materiens fysik
DOI
10.1038/s41535-021-00406-6