Quasi-Particle density of states of disordered d-wave superconductors
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We present a numerical study of the quasi-particle density of states
(DoS) of two-dimensional d-wave superconductors in the presence of
smooth disorder. We find power law scaling of the DoS with an
exponent depending on the strength of the disorder and the
superconducting order parameter in quantitative agreement with the
theory of Nersesyan et al. (Phys.Rev.Lett. 72,
2628 (1994)). For strong disorder a transition to a constant DoS
occurs. Our results are in contrast to the case of short-ranged
disorder.
4 pages, 5 figures included
4 pages, 5 figures included