Drude weight in non solvable quantum spin chains

Details Drude weight in non solvable quantum spin chains Drude weight in non solvable quantum spin chains

2010-12-02

arxiv.org/abs/1012.0403v1

Physics

Condensed Matter

Statistical Mechanics

10 pages

Scientific paper

For a quantum spin chain or 1D fermionic system, we prove that the Drude weight D verifies the universal Luttinger liquid relation $v_s^2=D/\kappa$, where $\kappa$ is the susceptibility and $v_s$ is the Fermi velocity. This result is proved by rigorous Renormalization Group methods and is true for any weakly interacting system, regardless its integrablity. This paper, combined with a previous paper of the same authors, completes the proof of the Luttinger liquid conjecture for such systems.

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