Electrically Tunable Superconductivity Through Surface Orbital Polarization

Abstract

We investigate the physical mechanisms for achieving an electrical control of conventional spin-singlet superconductivity in thin films by focusing on the role of surface orbital polarization. Assuming a multi-orbital description of the metallic state, due to screening effects the electric field acts by modifying the strength of the surface potential and, in turn, yields non-trivial orbital-Rashba couplings. The resulting orbital polarization at the surface and in its close proximity is shown to have a dramatic impact on superconductivity. We demonstrate that, by varying the strength of the electric field, the superconducting phase can be either suppressed, i.e. turned into normal metal, or undergo a $0-\pi$ transition with the $\pi$ phase being marked by non-trivial sign change of the superconducting order parameter between different bands. These findings unveil a rich scenario to design heterostructures with superconducting orbitronics effects.

version ad published; 14 pages, 15 panels of figures

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• Gate-controlled supercurrent in epitaxial Al/InAs nanowires
• Spectroscopic Signatures of Gate-Controlled Superconducting Phases
• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields
• Destroying superconductivity in thin films with an electric field
• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Magneto-topological transitions in multicomponent superconductors
• Theory of superconductivity in thin films under an external electric field
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• Impact of electrostatic fields in layered crystalline BCS superconductors
• Gate control of superconductivity in mesoscopic all-metallic devices
• Microscopic theory of supercurrent suppression by gate-controlled surface depairing
• Back-action supercurrent diodes
• High orbital-moment Cooper pairs by crystalline symmetry breaking
• Frustration driven Josephson phase dynamics
• Zero magnetic-field orbital vortices in s-wave spin-singlet superconductors
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium
• Phase slips dynamics in gated Ti and V all-metallic supercurrent nano-transistors: a review
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• Orbital currents in lattice multiorbital systems: Continuity equation, torques, and RKKY interaction
• Topological phase transitions in superconductors with chiral symmetry
• Microscopic mechanism of electric field-induced superconductivity suppression in metallic thin films
• Magnetic exchange interaction in spin-valve with chiral spin-triplet superconductor
• Orbital splitter effect and spatial resolution of current-induced orbital accumulation
• Sign competing sources of Berry curvature and anomalous Hall conductance humps in topological ferromagnets
• Interfacial control of vortex-limited critical current in type II superconductor films
• Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors
• Gate-control of the current-flux relation of a Josephson quantum interferometer based on proximitized metallic nanojuntions