Quantum phase transition in capacitively coupled double quantum dots
强关联电子
2007-05-23 v1 介观与纳米尺度物理
摘要
We investigate two equivalent, capacitively coupled semiconducting quantum dots, each coupled to its own lead, in a regime where there are two electrons on the double dot. With increasing interdot coupling a rich range of behavior is uncovered: first a crossover from spin- to charge-Kondo physics, via an intermediate SU(4) state with entangled spin and charge degrees of freedom; followed by a quantum phase transition of Kosterlitz-Thouless type to a non-Fermi liquid `charge-ordered' phase with finite residual entropy and anomalous transport properties. Physical arguments and numerical renormalization group methods are employed to obtain a detailed understanding of the problem.
引用
@article{arxiv.cond-mat/0505413,
title = {Quantum phase transition in capacitively coupled double quantum dots},
author = {Martin R. Galpin and David E. Logan and H. R. Krishnamurthy},
journal= {arXiv preprint arXiv:cond-mat/0505413},
year = {2007}
}
备注
4 pages, 3 figures