Author Affiliations

L. J. Sargent,^#,$ J. M. Rorison,^# I. H. White,^# R. V. Penty,^# M. Kuball,^#,* P. J. Heard,^#,** M. R. T. Tan,^#,† and S. Y. Wang^#,†

^#Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom

^*H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom

^**Interface Analysis Centre, Oldbury House, University of Bristol, Bristol BS2 8BS, United Kingdom

^†Hewlett Packard Laboratories, 3500 Deer Creek Road, Palo Alto, CA 94303, U.S.A.

^$ Laurence.Sargent@Bristol.ac.uk