Fate of disorder-induced inhomogeneities in strongly correlated d-wave superconductors

by Mr Debmalya Chakraborty (IISER Kolkata)

Wednesday 16 Apr 2014, 14:30 → 15:30 Asia/Kolkata

A304 (Colaba Campus)

We analyze the complex interplay of the strong correlations and impurities in a high temperature superconductor and show that both the nature and degree of the inhomogeneities change drastically due to strong correlations. While both the strong electronic repulsions and disorder contribute to the nanoscale inhomogeneity in the population of charge-carriers, we find them to compete with each other leading to a relatively smooth variation of the local density. Our self-consistent calculations prohibit the formation of distinct superconducting-`islands'. The reorganization of the spatial structures makes these superconductors surprisingly insensitive to the impurities. We also conclude that the underlying one-particle normal states reshape in a rich manner, such that the superconductor formed by pairing these states experiences a weaker but spatially correlated effective disorder. Such a route to superconductivity makes it tempting to extend Anderson's theorem to the correlated d-wave superconductors.