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Quasiparticle Poisoning and Josephson Current Fluctuations Induced by Kondo Impurities
- Source :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2008, 101, pp.247002, Physical Review Letters, 2008, 101, pp.247002
- Publication Year :
- 2008
- Publisher :
- HAL CCSD, 2008.
-
Abstract
- 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 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.<br />5 pages, 1 figure
- Subjects :
- Physics
Superconductivity
Toy model
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Degenerate energy levels
FOS: Physical sciences
General Physics and Astronomy
Electron
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
01 natural sciences
3. Good health
010305 fluids & plasmas
Coupling (physics)
Geometric phase
Condensed Matter::Superconductivity
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
Quasiparticle
Condensed Matter::Strongly Correlated Electrons
010306 general physics
Caltech Library Services
ComputingMilieux_MISCELLANEOUS
Spin-½
Subjects
Details
- Language :
- English
- ISSN :
- 00319007 and 10797114
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2008, 101, pp.247002, Physical Review Letters, 2008, 101, pp.247002
- Accession number :
- edsair.doi.dedup.....5c89d50b99a3d777868b51383bd2e6de