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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...