Nesting symmetries and diffusion in disordered d-wave superconductors

A. G. Yashenkin; W. A. Atkinson; I. V. Gornyi; P. J. Hirschfeld; D. V. Khveshchenko

doi:10.1103/physrevlett.86.5982

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Nesting symmetries and diffusion in disordered d-wave superconductors

A. G. Yashenkin·W. A. Atkinson·I. V. Gornyi·P. J. Hirschfeld·D. V. Khveshchenko

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Abstract

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 $(π,π)$ 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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A. G. Yashenkin, W. A. Atkinson, I. V. Gornyi, P. J. Hirschfeld, D. V. Khveshchenko. 2001-06-14. Nesting symmetries and diffusion in disordered d-wave superconductors. https://doi.org/10.1103/physrevlett.86.5982

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