In the Haldane model with s-wave pairing, Rashba spin-orbit coupling moves chiral edge states inside the superconducting gap and can produce a gapless topological superconducting phase.
Time-Reversal Symmetry Breaking in Re-Based Kagome Lattice Superconductor
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abstract
We investigated the Re-based kagome superconductor Re$_2$Zr through various measurements, including resistivity, magnetization, specific heat, and muon spin rotation and relaxation spectroscopy. These results suggest that Re$_2$Zr is a moderately coupled potential two-gap superconductor. Zero-field muon relaxation data indicate the possible presence of a time-reversal symmetry-breaking state in the superconducting ground state. Our investigation identifies Re$_{2}$Zr as a new unconventional superconductor with a potential complex order parameter that warrants considerable experimental and theoretical interest.
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Topological in-gap chiral edge states in superconducting Haldane model with spin-orbit coupling
In the Haldane model with s-wave pairing, Rashba spin-orbit coupling moves chiral edge states inside the superconducting gap and can produce a gapless topological superconducting phase.