Journal
PHYSICAL REVIEW LETTERS
Volume 100, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.217002
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Funding
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [704545] Funding Source: National Science Foundation
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We show that finite angular momentum pairing chiral superconductors on the triangular lattice have point zeroes in the complex gap function. A topological quantum phase transition takes place through a nodal superconducting state at a specific carrier density x(c) where the normal state Fermi surface crosses the isolated zeros. For spin-singlet pairing, we show that the second-nearest-neighbor (d + id)-wave pairing can be the dominant pairing channel. The gapless critical state at x(c) similar or equal to 0.25 has six Dirac points and is topologically nontrivial with a T(3) spin relaxation rate below T(c). This picture provides a possible explanation for the unconventional superconducting state of Na(x)CoO(2) center dot yH(2)O. Analyzing a pairing model with strong correlation using the Gutzwiller projection and symmetry arguments, we study these topological phases and phase transitions as a function of Na doping.
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