Nodal topology in d-wave superconducting monolayer FeSe
Takeru Nakayama, Tatsuya Shishidou, Daniel F. Agterberg
DOI 10.1103/PhysRevB.98.214503 · Physical Review B
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Abstract
A nodeless d-wave state is likely in superconducting monolayer FeSe on SrTiO3. The lack of nodes is surprising but has been shown to be a natural consequence of the observed small interband spin-orbit coupling. Here we examine the evolution from a nodeless state to the nodal state as this spin-orbit coupling is increased from a topological perspective. We show that this evolution depends strongly on the orbital content of the superconducting degrees of freedom. In particular, there are two d-wave solutions, which we call orbitally trivial and orbitally nontrivial. In both cases, the nodes carry a ±2 topological winding number that originates from a chiral symmetry. However, the momentum space distribution of the positive and negative charges is different for the two cases, resulting in a different evolution of these nodes as they annihilate to form a nodeless superconductor. We further show that the orbitally trivial and orbitally nontrivial nodal states exhibit different Andreev flat band spectra at the edge.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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