Flux-dependent Kondo temperature in an Aharonov-Bohm interferometer with an in-line quantum dot

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Abstract

An Aharonov-Bohm interferometer (ABI) carrying a quantum dot on one of its arms is analyzed. It is found that the Kondo temperature of the device may depend strongly on the magnetic flux penetrating the ring. As a result, mesoscopic finite-size effects appear leading to plateaus in the finite-temperature conductance as function of the flux. The possibility to deduce the transmission phase shift of the quantum dot from measurements of the ABI conductance when it is opened (i.e., is connected to more than two leads) is examined, leading to the conclusion that finite-size effects, when significant, may hinder the detection of the Kondo phase shift.

Original languageEnglish
Article number245313
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number24
DOIs
StatePublished - 15 Dec 2005

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