Edge Currents in Superconductors with a Broken Time-Reversal Symmetry
Bernd Braunecker, Patrick A. Lee, Ziqiang Wang
DOI 10.1103/PhysRevLett.95.017004 · Physical Review Letters
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Abstract
We analyze edge currents and edge bands at the surface of a time-reversal symmetry breaking dx2−y2+idxy superconductor. We show that the currents have large Friedel oscillations with two interfering frequencies: 2kF from subgap states, and 2kF from the continuum. The results are based independently on a self-consistent slave-boson mean-field theory for the t−J model on a triangular lattice, and on a T-matrix scattering theory calculation. The shape of the edge-state band, as well as the particular frequency 2kF of the Friedel oscillations, are attributes unique for the dx2−y2+idxy case, and may be used as a fingerprint for its identification. Extensions to different time-reversal symmetry breaking superconductors can be achieved within the same approach.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NaxCoO2·yH2O 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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