A measure of conductivity for lattice fermions at finite density

Details A measure of conductivity for lattice fermions at finite density A measure of conductivity for lattice fermions at finite density

1999-05-06

arxiv.org/abs/cond-mat/9905079v2

Phys.Lett. B489 (2000) 392

Physics

Condensed Matter

version to be published in Physics Letters B

Scientific paper

10.1016/S0370-2693(00)00398-1

We study the linear response to an external electric field of a system of
fermions in a lattice at zero temperature. This allows to measure numerically
the Euclidean conductivity which turns out to be compatible with an analytical
calculation for free fermions. The numerical method is generalizable to systems
with dynamical interactions where no analytical approach is possible.

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