| Quasiparticle Delocalization Induced by Novel Quantum Interference in Disordered d-Wave Superconductors (2002) | |||||||||
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| The diagrammatic approach is applied to study quasiparticle transport properties in two-dimensional d-wave superconductors with dilute nonmagnetic impurities both in Born and in unitary limits. It is found that a novel quantum interference process gives rise to a weak-antilocalization correction to the spin conductivity, indicating the existence of extended low-energy quasiparticle states. With comimg close to unitarity and the nesting, this correction is suppressed and eventually vanishes due to the global particle-hole symmetry.. Comment: 8 pages, 2 figures | |||||||||
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