Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires
Journal article, 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.

Author

Gyanendra Singh

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Claudio Guarcello

Complesso Univ Monte S Angelo

University of Salerno

Edouard Lesne

Delft University of Technology

Dag Winkler

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Tord Claeson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Floriana Lombardi

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrea D. Caviglia

Delft University of Technology

Roberta Citro

Complesso Univ Monte S Angelo

University of Salerno

Mario Cuoco

University of Salerno

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

NPJ QUANTUM MATERIALS

2397-4648 (eISSN)

Vol. 7 1 2

Multifunktionella gränsytor i komplexa metalloxider för styrbar elektronik

Swedish Research Council (VR) (2016-05256), 2017-01-01 -- 2020-12-31.

Subject Categories

Other Physics Topics

Fusion, Plasma and Space Physics

Condensed Matter Physics

DOI

10.1038/s41535-021-00406-6

More information

Latest update

6/13/2022