2000•Research at the University of Copenhagen (University of Copenhagen)Requires access
Investigation of the mesoscopic Aharonov-Bohm effect in low magnetic fields
Hansen, Adam Espe, Pedersen, Simon Vind Daugaard, Kristensen, Anders, C. B. Sørensen, P. E. Lindelöf
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Abstract
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 $\pi$ 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.