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The Aharonov-Bohm effect in a mesoscopic ring of diluted magnetic alloy

Research output: Contribution to journalJournal article

Published

Journal publication date13/04/1992
JournalJournal of Physics: Condensed Matter
Journal number15
Volume4
Number of pages12
Pages3943-3954
Original languageEnglish

Abstract

The spin dynamics of magnetic impurities is shown to play a crucial role in mesoscopic effects. It follows from this analysis that the quantum magnetoconductance oscillations in a mesoscopic ring of a diluted magnetic alloy are gradually suppressed in the paramagnetic regime, whereas a strong magnetic field forbids spin-flip processes and restores the mesoscopic Aharonov-Bohm oscillations with an amplitude limited by the efficiency of electron escape to the bulk. This effect is examined analytically using a model of a quasi one-dimensional ring joined to the electrodes by tunnelling contacts or short leads.