We have investigated the Aharonov-Bohm effect in mesoscopic semiconductor GaAs/GaAlAs rings in low magnetic fields. The oscillatory magnetoconductance of these systems is systematically studied as a function of electron 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/9909246,
title = {Investigation of the Mesoscopic Aharonov-Bohm effect in Low Magnetic Fields},
author = {A. E. Hansen and S. Pedersen and A. Kristensen and C. B. Sorensen and P. E. Lindelof},
journal= {arXiv preprint arXiv:cond-mat/9909246},
year = {2009}
}
Comments
4 pages, 4 figures; to appear in Physica E (proceedings of MSS9)