Phys. Rev. Lett. 74, 972–975 (1995)Integrability and Ideal Conductance at Finite TemperaturesReceived 11 October 1994; published in the issue dated 6 February 1995 We analyze the finite temperature charge stiffness D(T>0), using a generalization of Kohn's method, for the problem of a particle interacting with a fermionic bath in one dimension. We present analytical evidence, using the Bethe ansatz method, that D(T>0) is finite in the integrable case where the mass of the particle equals the mass of the fermions and numerical evidence that it vanishes in the nonintegrable case of unequal masses. We conjecture that a finite D(T>0) is a generic property of integrable systems. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.972
DOI:
10.1103/PhysRevLett.74.972
PACS:
71.27.+a, 05.45.+b, 72.10.-d
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