Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field
Mesoscale and Nanoscale Physics
2009-10-31 v2 Strongly Correlated Electrons
Abstract
Linear conductance through a quantum dot is calculated under a finite magnetic field using the modified perturbation theory. The method is based on the second-order perturbation theory with respect to the Coulomb repulsion, but the self-energy is modified to reproduce the correct atomic limit and to fulfill the Friedel sum rule exactly. Although this method is applicable only to zero temperature in a strict sense, it is approximately extended to finite temperatures. It is found that the conductance near electron-hole symmetry is suppressed by the application of the magnetic field at low temperatures. Positive magnetoconductance is observed in the case of large electron-hole asymmetry.
Keywords
Cite
@article{arxiv.cond-mat/9907409,
title = {Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field},
author = {Osamu Takagi and Tetsuro Saso},
journal= {arXiv preprint arXiv:cond-mat/9907409},
year = {2009}
}
Comments
4pages, 5 figures