title: Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices.
abstract: The recent development in the fabrication of artificial oxide heterostructures opens new avenues in the field of quantum materials by enabling the manipulation of the charge, spin and orbital degrees of freedom. In this context, the discovery of two-dimensional electron gases (2-DEGs) at LaAlO3/SrTiO3 interfaces, which exhibit both superconductivity and strong Rashba spin-orbit coupling (SOC), represents a major breakthrough. Here, we report on the realisation of a field-effect LaAlO3/SrTiO3 device, whose physical properties, including superconductivity and SOC, can be tuned over a wide range by a top-gate voltage. We derive a phase diagram, which emphasises a field-effect-induced superconductor-to-insulator quantum phase transition. Magneto-transport measurements show that the Rashba coupling constant increases linearly with the interfacial electric field. Our results pave the way for the realisation of mesoscopic devices, where these two properties can be manipulated on a local scale by means of top-gates.
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Hurand
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Jouan
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Feuillet-Palma
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: Singh
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: J
authors.initials: J
authors.lastname: Biscaras
authors.affiliation: Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.
authors.forename: E
authors.initials: E
authors.lastname: Lesne
authors.affiliation: Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.
authors.forename: N
authors.initials: N
authors.lastname: Reyren
authors.affiliation: Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.
authors.forename: A
authors.initials: A
authors.lastname: Barthélémy
authors.affiliation: Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.
authors.forename: M
authors.initials: M
authors.lastname: Bibes
authors.affiliation: Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France.
authors.forename: J E
authors.initials: JE
authors.lastname: Villegas
authors.affiliation: Laboratoire de Photonique et de Nanostructures LPN-CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: C
authors.initials: C
authors.lastname: Ulysse
authors.affiliation: Laboratoire de Photonique et de Nanostructures LPN-CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: X
authors.initials: X
authors.lastname: Lafosse
authors.affiliation: DSM/IRAMIS/SPEC - CNRS UMR 3680, CEA Saclay, F-91191 Gif sur Yvette Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Pannetier-Lecoeur
authors.affiliation: Dipartimento di Fisica Università di Roma "La Sapienza", piazzale Aldo Moro 5, I-00185 Roma, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Caprara
authors.affiliation: Dipartimento di Fisica Università di Roma "La Sapienza", piazzale Aldo Moro 5, I-00185 Roma, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Grilli
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: J
authors.initials: J
authors.lastname: Lesueur
authors.affiliation: Laboratoire de Physique et d'Etude des Matériaux -CNRS-ESPCI ParisTech-UPMC, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: N
authors.initials: N
authors.lastname: Bergeal