We have investigated the Aharonov-Bohm effect in a one-dimensional GaAs/GaAlAs ring at low magnetic fields. The oscillatory magnetoconductance of these systems are for the first time systematically studied as a function of density. We observe phase-shifts of π in the magnetoconductance oscillations, and halving of the fundamental h/e period, as the density is varied. Theoretically we find agreement with the experiment, by introducing an asymmetry between the two arms of the ring.
@article{arxiv.cond-mat/9905033,
title = {Observation of Quantum Asymmetry in an Aharonov-Bohm Ring},
author = {S. Pedersen and A. E. Hansen and A. Kristensen and C. B. Soerensen and P. E. Lindelof},
journal= {arXiv preprint arXiv:cond-mat/9905033},
year = {2009}
}
Comments
4 pages RevTex including 3 figures, submitted to Phys. Rev. B