Coulomb Charging Effects in an Open Quantum Dot
Abstract
Low-temperature transport properties of a lateral quantum dot formed by overlaying finger gates in a clean one-dimensional channel are investigated. Continuous and periodic oscillations superimposed upon ballistic conductance steps are observed, when the conductance G of the dot changes within a wide range 0<G<6e^2/h. Calculations of the electrostatics confirm that the measured periodic conductance oscillations correspond to successive change of the total charge of the dot by . By modelling the transport it is shown that the progression of the Coulomb oscillations into the region G>2e^2/h may be due to suppression of inter-1D-subband scattering. Fully transmitted subbands contribute to coherent background of conductance, while sequential tunneling via weakly transmitted subbands leads to Coulomb charging of the dot.
Cite
@article{arxiv.cond-mat/0003021,
title = {Coulomb Charging Effects in an Open Quantum Dot},
author = {O. A. Tkachenko and V. A. Tkachenko and D. G. Baksheyev and C. -T. Liang and M. Y. Simmons and C. G. Smith and D. A. Ritchie and Gil-Ho Kim and M. Pepper},
journal= {arXiv preprint arXiv:cond-mat/0003021},
year = {2009}
}
Comments
12 pages, RevTeX, 15 eps figures included, submitted to Phys. Rev. B