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

Flux-dependent Kondo temperature in an Aharonov-Bohm interferometer with an in-line quantum dot 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

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

Simon, Pascal; Entin-Wohlman, O; Aharony, A
Physical Review B , Volume 72 (24) – Dec 15, 2005
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Publisher
American Physical Society (APS)
Copyright
Copyright © 2005 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.72.245313
Publisher site
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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.

Journal

Physical Review B – American Physical Society (APS)

Published: Dec 15, 2005

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