Unstable particles versus resonances in impurity systems, conductance in quantum wires

Castro-Alvaredo, O. & Fring, A. (2002). Unstable particles versus resonances in impurity systems, conductance in quantum wires. Journal of Physics: Condensed Matter, 14(47), doi: 10.1088/0953-8984/14/47/101

Abstract

We compute the DC conductance for a homogeneous sine–Gordon model and an impurity system, which in the conformal limit can be reduced to a Luttinger liquid, by means of the thermodynamic Bethe ansatz and standard potential scattering theory. We demonstrate that unstable particles and resonances in impurity systems lead to a sharp increase of the conductance as a function of the temperature, which is characterized by the Breit–Wigner formula.