Impurity and correlation effects on transport in one-dimensional quantum wires
Abstract
We study transport through a one-dimensional quantum wire of correlated fermions connected to semi-infinite leads. The wire contains either a single impurity or two barriers, the latter allowing for resonant tunneling. In the leads the fermions are assumed to be non-interacting. The wire is described by a microscopic lattice model. Using the functional renormalization group we calculate the linear conductance for wires of mesoscopic length and for all relevant temperature scales. For a single impurity, either strong or weak, we find power-law behavior as a function of temperature. In addition, we can describe the complete crossover from the weak- to the strong-impurity limit. For two barriers, depending on the parameters of the enclosed quantum dot, we find temperature regimes in which the conductance follows power-laws with "universal" exponents as well as non-universal behavior. Our approach leads to a comprehensive picture of resonant tunneling. We compare our results with those of alternative approaches.
Cite
@article{arxiv.cond-mat/0411310,
title = {Impurity and correlation effects on transport in one-dimensional quantum wires},
author = {T. Enss and V. Meden and S. Andergassen and X. Barnabe-Theriault and W. Metzner and K. Schoenhammer},
journal= {arXiv preprint arXiv:cond-mat/0411310},
year = {2007}
}
Comments
slightly extended version (e.g. new paragraph about position dependence of impurity), accepted for publication in Phys. Rev. B, 20 pages, 19 figures