Many Body Effects on Electron Tunneling through Quantum Dots in an Aharonov-Bohm Circuit

概要

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Ttrnneling condtrctance of an Aharonov-Bohraa circttit inclttding two qtrantutn dots is calcuRated based on the general expression of the conductance in the linear response regime of thebias voltage. The calctrlation is perfornaed ita a wide ternperature range by using numericalrenormalization group raaethod. Various types of AB oscilla'ttions appear depending on the tenuperattrre and the poteuatial dejctlx of the dots. Bspecially, AB oscillations have strong higherharmonies conaponents as a function of the rtaagnetic fltrx when the potential of the dots is deep.This is related to the crossover of the spin state due to the Kondo effect on qtranttrm dots, Whenthe temperattrre rises up, the amplittrde of the AB oscillations becomes snaaller reflecting thebreaking of the coherency.
社団法人日本物理学会の論文
1997-03-15