Hallmarks of non-trivial topology in Josephson junctions based on oxide nanochannels

Abstract

We investigate the topological properties of a Josephson junction obtained by constraining a two-dimensional electron gas at oxide interface to form a quasi-1D conductor. We reveal an anomalous critical current behaviour with a magnetic field applied perpendicular to the Rashba spin-orbit one. We relate the observed critical current enhancement at small magnetic fields with a non-trivial topology, accompanied by Majorana bound states (MBSs) pinned at the edges of the superconducting leads. Signatures of MBSs also include a sawtooth profile in the current-phase relation. Our findings allow to recognize fingerprints of topological superconductivity in non-centrosymmetric materials and confined systems with Rashba spin-orbit interaction, and to explain recent experimental observations for which a microscopic description is still lacking.

10 pages, 8 figures, paper

References in corpus (13)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• 0-pi Josephson tunnel junctions with ferromagnetic barrier
• Majorana splitting from critical currents in Josephson junctions
• Topological superconductivity and unconventional pairing in oxide interfaces
• Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device
• Topological insulator based spin valve devices: evidence for spin polarized transport of spin-momentum-locked topological surface states
• Unveiling Signatures of Topological Phases in Open Kitaev Chains and Ladders
• Testing the formation of Majorana states using the Majorana Polarization
• Topological phases of an interacting Majorana Benalcazar-Bernevig-Hughes model

Cited by in corpus (11)

• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Engineered Josephson diode effect in kinked Rashba nanochannels
• Probing Topological Superconductivity of oxide nanojunctions using fractional Shapiro steps
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Mixed higher-order topology and nodal and nodeless flat band topological phases in a superconducting multiorbital model
• Theory of charge-to-spin conversion under quantum confinement
• Edelstein Effect in Isotropic and Anisotropic Rashba Models
• Angular momentum of vortex-core Majorana zero modes
• Enhancement of the topological regime in elongated Josephson junctions
• Boltzmann theory of the inverse Edelstein effect in a two-dimensional Rashba gas
• Inversion-symmetric Electron Gases as New Platforms for Topological Planar Josephson Junctions