Spontaneous edge and corner currents in s+is superconductors and time reversal symmetry breaking surface states
Andrea Benfenati, Egor Babaev
DOI 10.1103/PhysRevB.105.134518 · Physical Review B
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Abstract
We present a study of the basic microscopic model of a s-wave superconductor with frustrated interband interaction. When frustration is strong, such an interaction gives raise to a s+is state. This is a s-wave superconductor that spontaneously breaks time reversal symmetry. We show that in addition to the known s+is state, there is additional phase where the system's bulk is a conventional s-wave state, but superconducting surface states break time reversal symmetry. Furthermore, we show that s+is superconductors can have spontaneous boundary currents and spontaneous magnetic fields. These arise at lower-dimensional boundaries, namely, the corners in two-dimensional samples. This demonstrates that boundary currents effects in superconductors can arise in states which are not topological and not chiral according to the modern classification.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 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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