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.
Superconductivity in kagome metals due to soft loop-current fluctuations
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abstract
We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral $d+id$ superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an $s^{\pm}$ state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition.
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NMR measurements provide evidence for a static loop-current state breaking C6 symmetry in the CDW phase of CsV3Sb5, with an internal magnetic field of 3.6 Oe at V sites and orbital moments of 0.002-0.01 μB.
Soft loop-current fluctuations involving vanadium and antimony orbitals in kagome metals mediate chiral d+id and disorder-robust s± pairing channels, with a pressure-driven Lifshitz transition selecting between them.
Symmetry-enforced PDW emerges at p-type vHS and chiral interband superconductivity stabilizes near p-m' vHS degeneracy in the extended t-J model on the Kagome lattice.
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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NMR evidence for a loop-current state with broken $C_6$ symmetry in the charge-ordered CsV$_3$Sb$_5$
NMR measurements provide evidence for a static loop-current state breaking C6 symmetry in the CDW phase of CsV3Sb5, with an internal magnetic field of 3.6 Oe at V sites and orbital moments of 0.002-0.01 μB.
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Superconductivity in kagome metals due to soft loop-current fluctuations
Soft loop-current fluctuations involving vanadium and antimony orbitals in kagome metals mediate chiral d+id and disorder-robust s± pairing channels, with a pressure-driven Lifshitz transition selecting between them.
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Symmetry-Enforced Pair-Density Wave and Chiral Interband Superconductivity in Strongly Correlated Kagome Systems
Symmetry-enforced PDW emerges at p-type vHS and chiral interband superconductivity stabilizes near p-m' vHS degeneracy in the extended t-J model on the Kagome lattice.