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A measure of conductivity for lattice fermions at finite density |
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| Authors: | J. L. Alonso L. A. Fern ndez V. Martí n-Mayor |
| Affiliation: | a Departamento de Física Teórica, Universidad de Zaragoza, 50009 Zaragoza, Spain b Departamento de Física Teórica I, Universidad Complutense de Madrid, 28040 Madrid, Spain c Dipartimento di Fisica, Universitá di Roma I, 00185 Roma, Italy |
| Abstract: | 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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