Observation of Quantum Asymmetry in an Aharonov-Bohm Ring

Details Observation of Quantum Asymmetry in an Aharonov-Bohm Ring Observation of Quantum Asymmetry in an Aharonov-Bohm Ring

1999-05-04

arxiv.org/abs/cond-mat/9905033v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages RevTex including 3 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.5457

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 $\pi$ 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.

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