Stabilization of single-electron pumps by high magnetic fields
Mesoscale and Nanoscale Physics
2013-05-30 v3 Quantum Physics
Abstract
We study the effect of perpendicular magnetic fields on a single-electron system with a strongly time-dependent electrostatic potential. Continuous improvements to the current quantization in these electron pumps are revealed by high-resolution measurements. Simulations show that the sensitivity of tunnel rates to the barrier potential is enhanced, stabilizing particular charge states. Nonadiabatic excitations are also suppressed due to a reduced sensitivity of the Fock-Darwin states to electrostatic potential. The combination of these effects leads to significantly more accurate current quantization.
Keywords
Cite
@article{arxiv.1107.4560,
title = {Stabilization of single-electron pumps by high magnetic fields},
author = {J. D. Fletcher and M. Kataoka and S. P. Giblin and Sunghun Park and H. -S. Sim and P. See and T. J. B. M. Janssen and J. P. Griffiths and G. A. C. Jones and H. E. Beere and D. A. Ritchie},
journal= {arXiv preprint arXiv:1107.4560},
year = {2013}
}