Quantum Phase Transition in a Multi-Level Dot
介观与纳米尺度物理
2009-11-07 v2 强关联电子
摘要
We discuss electronic transport through a lateral quantum dot close to the singlet-triplet degeneracy in the case of a single conduction channel per lead. By applying the Numerical Renormalization Group, we obtain rigorous results for the linear conductance and the density of states. A new quantum phase transition of the Kosterlitz-Thouless type is found, with an exponentially small energy scale close to the degeneracy point. Below , the conductance is strongly suppressed, corresponding to a universal dip in the density of states. This explains recent transport measurements.
引用
@article{arxiv.cond-mat/0108359,
title = {Quantum Phase Transition in a Multi-Level Dot},
author = {Walter Hofstetter and Herbert Schoeller},
journal= {arXiv preprint arXiv:cond-mat/0108359},
year = {2009}
}
备注
4 pages, 5 eps figures, published version