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

Complesso Univ Monte S Angelo

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

Complesso Univ Monte S Angelo

Universita degli Studi di Salerno

Mario Cuoco

Universita degli Studi di Salerno

Alexei Kalaboukhov

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

NPJ QUANTUM MATERIALS

2397-4648 (eISSN)

Vol. 7 1 2

Multifunktionella gränsytor i komplexa metalloxider för styrbar elektronik

Vetenskapsrådet (VR) (2016-05256), 2017-01-01 -- 2020-12-31.

Ämneskategorier

Annan fysik

Fusion, plasma och rymdfysik

Den kondenserade materiens fysik

DOI

10.1038/s41535-021-00406-6

Mer information

Senast uppdaterat

2022-01-20