Abstract

Motivated by evidence for time-reversal symmetry breaking in nonmagnetic kagome metals AV₃Sb₅ (A = K, Rb, Cs), this work studies superconducting pairing on a loop-current Chern metal on the kagome lattice. In a one-orbital kagome model near van Hove filling, the charge-density-wave state with loop-current order produces a partially filled Chern band with three Chern Fermi pockets. The resulting three-component superconducting order exhibits complex Josephson couplings and can stabilize chiral roton superconductivity with 120° phase locking, vortex-antivortex lattices, chiral edge states, fractional 1/3-vortex excitations, and coherent charge-6e Cooper-pair triplets.

Abstract

Motivated by evidence for time-reversal symmetry breaking in nonmagnetic kagome metals AV₃Sb₅ (A = K, Rb, Cs), this work studies superconducting pairing on a loop-current Chern metal on the kagome lattice. In a one-orbital kagome model near van Hove filling, the charge-density-wave state with loop-current order produces a partially filled Chern band with three Chern Fermi pockets. The resulting three-component superconducting order exhibits complex Josephson couplings and can stabilize chiral roton superconductivity with 120° phase locking, vortex-antivortex lattices, chiral edge states, fractional 1/3-vortex excitations, and coherent charge-6e Cooper-pair triplets.

Abstract

Motivated by evidence for time-reversal symmetry breaking in nonmagnetic kagome metals AV₃Sb₅ (A = K, Rb, Cs), this work studies superconducting pairing on a loop-current Chern metal on the kagome lattice. In a one-orbital kagome model near van Hove filling, the charge-density-wave state with loop-current order produces a partially filled Chern band with three Chern Fermi pockets. The resulting three-component superconducting order exhibits complex Josephson couplings and can stabilize chiral roton superconductivity with 120° phase locking, vortex-antivortex lattices, chiral edge states, fractional 1/3-vortex excitations, and coherent charge-6e Cooper-pair triplets.

Abstract

Motivated by evidence for time-reversal symmetry breaking in nonmagnetic kagome metals AV₃Sb₅ (A = K, Rb, Cs), this work studies superconducting pairing on a loop-current Chern metal on the kagome lattice. In a one-orbital kagome model near van Hove filling, the charge-density-wave state with loop-current order produces a partially filled Chern band with three Chern Fermi pockets. The resulting three-component superconducting order exhibits complex Josephson couplings and can stabilize chiral roton superconductivity with 120° phase locking, vortex-antivortex lattices, chiral edge states, fractional 1/3-vortex excitations, and coherent charge-6e Cooper-pair triplets.