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Phys. Rev. B 72, 245313 (2005) [12 pages]

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

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Pascal Simon1,2, O. Entin-Wohlman2,3,4,*, and A. Aharony2,3,*
1Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS et Université Joseph Fourier, 38042 Grenoble, France
2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
3Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel
4Albert Einstein Minerva Center for Theoretical Physics at the Weizmann Institute of Science, Rehovot 76100, Israel

Received 13 July 2005; published 9 December 2005

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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.245313
DOI:
10.1103/PhysRevB.72.245313
PACS:
71.10.−w, 72.15.Qm, 73.63.Kv, 73.21.−b

*On leave from the School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.

 
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