Non-uniform Berry curvature in parent Chern bands induces momentum-space vortices in the chiral superconducting gap function, with the parent Chern number constraining vortex count independently of model details.
Super- conductivity from spin-canting fluctuations in rhombohe- dral graphene
5 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Rhombohedral graphene multilayers host various broken-symmetry metallic phases as well as superconductors whose pairing mechanism and order parameter symmetry remain unsettled. Strikingly, experiments have revealed prominent new superconducting regions in rhombohedral bilayer and trilayer graphene devices with proximity-induced Ising spin-orbit coupling. We propose that these superconductors descend from a common spin-canted normal state that spontaneously breaks a U(1) spin symmetry and thus supports soft magnon modes. In particular, we show that these soft modes can mediate pairing through inter-band scattering events that are symmetry-forbidden in the absence of spin-orbit coupling, thus providing a promising explanation for spin-orbit-enabled pairing. Numerous other experimental observations -- including nontrivial dependence of superconductivity on the spin-orbit coupling strength, in-plane magnetic fields, and Fermi surface structure -- also naturally follow from our scenario.
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Weak easy-plane anisotropy generates attractive equal-spin p-wave pairing via two-magnon exchange in a 2D half-metal, with λp enhanced to O(1) near the ferromagnetic onset.
Chiral Bloch states in rhombohedral n-layer graphene cause high-harmonic generation whose dominant order scales linearly with n, with valley splitting producing n-dependent circular dichroism.
A microscopic tunneling approach is developed showing that scanning tunneling spectroscopy can distinguish commensurate and incommensurate single-q pairing states and a three-q moiré superconductor in rhombohedral graphene via broken time-reversal symmetry features and spatial Andreev conductance.
Theory for QPI in chiral-band superconductors shows impurity-induced local spectral functions distinguish zero- and finite-momentum pairing states.
citing papers explorer
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Chiral superconductors from parent states with non-uniform Berry curvature: Momentum-space vortices, BdG topology, and thermal Hall conductivity
Non-uniform Berry curvature in parent Chern bands induces momentum-space vortices in the chiral superconducting gap function, with the parent Chern number constraining vortex count independently of model details.
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Magnon-Mediated Superconductivity in a 2D Itinerant Ferromagnet with Weak Easy-plane Magnetic Anisotropy
Weak easy-plane anisotropy generates attractive equal-spin p-wave pairing via two-magnon exchange in a 2D half-metal, with λp enhanced to O(1) near the ferromagnetic onset.
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High-harmonic generation in systems with chiral Bloch states: application to rhombohedral graphene
Chiral Bloch states in rhombohedral n-layer graphene cause high-harmonic generation whose dominant order scales linearly with n, with valley splitting producing n-dependent circular dichroism.
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Probing superconductivity with tunneling spectroscopy in rhombohedral graphene
A microscopic tunneling approach is developed showing that scanning tunneling spectroscopy can distinguish commensurate and incommensurate single-q pairing states and a three-q moiré superconductor in rhombohedral graphene via broken time-reversal symmetry features and spatial Andreev conductance.
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Probing pairing symmetries through quasiparticle interference in chiral Bloch bands
Theory for QPI in chiral-band superconductors shows impurity-induced local spectral functions distinguish zero- and finite-momentum pairing states.