We present experimental studies of the current pumped through a dynamic quantum dot over a wide range of magnetic fields. At low fields we observe repeatable structure indicating increased confinement of the electrons in the dynamic dot. At higher fields (B>3T), we observe structure which changes markedly from device to device suggesting that in this regime the transport is sensitive to local disorder. The results are significant for the development of dynamic quantum dot pumps as quantum standards of electrical current.
@article{arxiv.1009.0203,
title = {Single- and few-electron dynamic quantum dots in a perpendicular magnetic field},
author = {S. J. Wright and A. L. Thorn and M. D. Blumenthal and S. P. Giblin and M. Pepper and T. J. B. M. Janssen and M. Kataoka and J. D. Fletcher and G. A. C. Jones and C. A. Nicoll and Godfrey Gumbs and D. A. Ritchie},
journal= {arXiv preprint arXiv:1009.0203},
year = {2011}
}
Comments
5 pages, 4 figures, submitted to J. Appl. Phys. as an invited paper for ICPS-30, 25th-30th July, Seoul, SK