Investigation of the Mesoscopic Aharonov-Bohm effect in Low Magnetic Fields

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.

arXiv comment4 pages, 4 figures; to appear in Physica E (proceedings of MSS9)

References in corpus (5)

• Observation of Quantum Asymmetry in an Aharonov-Bohm Ring
• Channel Interference in a Quasi Ballistic Aharonov-Bohm Experiment
• Correlations between Aharonov-Bohm effects and one-dimensional subband populations in GaAs/Al${}_x$Ga${}_{1-x}$As rings
• Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts
• Electron focusing, mode spectroscopy and mass enhancement in small GaAs/AlGaAs rings

Cited by in corpus (3)

• Mesoscopic decoherence in Aharonov-Bohm rings
• Mesoscopic Capacitance Oscillations
• Ballistic Quantum Transport: Effect of Geometrical Phases