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Quasiparticle Poisoning and Josephson Current Fluctuations Induced by Kondo Impurities

Faoro, Lara and Kitaev, Alexei and Ioffe, Lev B. (2008) Quasiparticle Poisoning and Josephson Current Fluctuations Induced by Kondo Impurities. Physical Review Letters, 101 (24). Art. No. 247002. ISSN 0031-9007.

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We introduce a toy model that allows us to study the physical properties of a spin impurity coupled to the electrons in the superconducting island. We show that, when the coupling of the spin is of the order of the superconducting gap Delta, two almost degenerate subgap states are formed. By computing the Berry phase that is associated with the superconducting phase rotations in this model, we prove that these subgap states are characterized by a different charge and demonstrate that the switching between these states has the same effect as quasiparticle poisoning (unpoisoning) of the island. We also show that an impurity coupled to both the island and the lead generates Josepshon current fluctuations.

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Additional Information:© 2008 The American Physical Society. Received 25 January 2008; published 10 December 2008. This work was supported by the National Security Agency (NSA) under Army Research Office (ARO) Contract No. W911NF-06-1-0208 and NSF ECS 0608842.
Funding AgencyGrant Number
National Security AgencyUNSPECIFIED
Army Research OfficeW911NF-06-1-0208
National Science FoundationECS 0608842
Issue or Number:24
Record Number:CaltechAUTHORS:FAOprl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12496
Deposited By: Archive Administrator
Deposited On:11 Dec 2008 07:00
Last Modified:03 Oct 2019 00:29

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