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Linear Response Theory Around a Localized Impurity in the Pseudogap Regime of an Anisotropic Superconductor

Andrenacci, N. ; Angilella, G. ; Beck, H. ; Pucci, R.

In: Journal of Superconductivity, 2005, vol. 18, no. 5-6, p. 613-617

Internal structure of fluctuating Cooper pairs

Andrenacci, N. ; Capezzali, M. ; Beck, H.

In: The European Physical Journal B - Condensed Matter and Complex Systems, 2006, vol. 53, no. 4, p. 417-432

Ward identity and optical conductivity sum rule in the d-density wave state

Benfatto, Larra ; Sharapov, S. G. ; Andrenacci, N. ; Beck, Hans

In: Physical Review B, 2005, vol. 71, p. 104511

We consider the role of the Ward identity in dealing with the transport properties of an interacting system forming a d-wave modulated charge-density wave or staggered flux phase. In particular, we address this issue from the point of view of the restricted optical-conductivity sum rule. Our aim is to provide a controlled approximation for the current-current correlation function which allows us...