1208.0671 (Balázs Hetényi)
Balázs Hetényi
The Drude and superfluid weights are investigated in the context of variational theory. It is shown that a commonly applied procedure to obtain the Drude weight actually corresponds to the superfluid weight. This realization changes previous interpretations of conductivity for variational wavefunctions, one result being that the Gutzwiller wavefunction displays a finite superfluid weight at finite interaction. To gain insight into DC conductivity an expression for the current response in terms of a geometric phase is derived. Applying to the Gutzwiller wavefunction it is shown that for any value of the interaction the Gutzwiller wavefunction is a perfect conductor.
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http://arxiv.org/abs/1208.0671
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