Nesting symmetries and diffusion in disordered d-wave superconductors

Details Nesting symmetries and diffusion in disordered d-wave superconductors Nesting symmetries and diffusion in disordered d-wave superconductors

2001-02-16

arxiv.org/abs/cond-mat/0102310v2

Phys. Rev. Lett. v.86, p.5982 (2001)

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevLett.86.5982

The low-energy density of states (DOS) of disordered 2D d-wave superconductors is extremely sensitive to details of both the disorder model and the electronic band structure. Using diagrammatic methods and numerical solutions of the Bogoliubov-de Gennes equations, we show that the physical origin of this sensitivity is the existence of a novel diffusive mode with momentum close to $(\pi,\pi)$ which is gapless only in systems with a global nesting symmetry. We find that in generic situations, the DOS vanishes at the Fermi level. However, proximity to the highly symmetric case may nevertheless lead to observable non-monotonic behavior of the DOS in the cuprates.

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