Drude weight in systems with open boundary conditions
Abstract
A many-electron conducting system undergoes free acceleration in response to a macroscopic field. The Drude weight ---also called charge stiffness---measures the adiabatic (inverse) inertia of the electrons; the formal expression requires periodic boundary conditions. When instead a bounded sample is addressed within open boundary conditions, no current flows and a constant (external) field only polarizes the sample: the Faraday cage effect. Nonetheless a low-frequency field induces forced oscillations: we show here that the low-frequency linear response of the bounded system is dominated by the adiabatic inertia and allows an alternative evaluation of . Simulations on model one-dimensional systems demonstrate our main message.
Cite
@article{arxiv.2007.04143,
title = {Drude weight in systems with open boundary conditions},
author = {Gabriele Bellomia and Raffaele Resta},
journal= {arXiv preprint arXiv:2007.04143},
year = {2020}
}
Comments
8 pages, 6 figures | Minor corrections w.r.t. v2 (mostly typos) | Accepted for pubblication in Phys. Rev. B