Chiral d+is superconducting state in the two-dimensional t−t′ Hubbard model
J. Mráz, R. Hlubina
DOI 10.1103/PhysRevB.69.104501 · Physical Review B
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Abstract
Applying the recently developed variational approach to Kohn-Luttinger superconductivity to the t−t′ Hubbard model in two dimensions, we have found, for sizeable next-nearest-neighbor hopping, an electron-density-controlled quantum phase transition between a d-wave superconducting state close to half filling and an s-wave superconductor at lower electron density. The transition occurs via an intermediate time-reversal breaking d+is superconducting phase, which is characterized by nonvanishing chirality and density-current correlation. Our results suggest the possibility of a bulk time-reversal symmetry breaking state in overdoped cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Hg 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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