Phase Effects on the Conductance Through Parallel Double Dots

Details Phase Effects on the Conductance Through Parallel Double Dots Phase Effects on the Conductance Through Parallel Double Dots

2004-04-28

arxiv.org/abs/cond-mat/0404685v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to PRL 10/2003

Scientific paper

10.1103/PhysRevB.72.125302

Phase effects on the conductance of a double-dot system in a ring structure threaded by a magnetic flux are studied. The Aharonov-Bohm effect combined with the dot many-body charging effects determine the phases of the currents going through each arm of the ring. The cases for zero magnetic flux or half a quantum of flux are discussed in detail. It is shown that, depending upon the magnetic flux and the state of charge of the dots, controlled by gate potentials, the dephasing of the upper and lower arm current gives rise to a $S=1/2$ or S=1 Kondo regime. We also show that even in the absence of a magnetic flux there can be a circulating current in the ring, depending on the system parameters.

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