Josephson current through a Kondo molecule

Abstract

We investigate transport of Cooper pairs through a double quantum dot (DQD) in the Kondo regime and coupled to superconducting leads. Within the non-perturbative slave boson mean-field theory we evaluate the Josephson current for two different configurations, the DQD coupled in parallel and in series to the leads. We find striking differences between these configurations in the supercurrent as a function of the ratio t/Γ, where t is the interdot coupling and Γis the coupling to the leads: the critical current I_c decreases monotonously with t/Γfor the parallel configuration whereas I_c exhibits a maximum at t/Γ=1 in the serial case. These results demonstrate that a variation of the ratio t/Γenables to control the flow of supercurrent through the Kondo resonance of the DQD.

5 pages, 4 figures

References in corpus (3)

• Quantum supercurrent transistors in carbon nanotubes
• Molecular states in carbon nanotube double quantum dots
• Excited state spectroscopy in carbon nanotube double quantum dots

Cited by in corpus (5)

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• Josephson Effect through an isotropic magnetic molecule
• Josephson effect through a quantum dot array
• Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting Leads
• Fano effect in a Josephson junction with a quantum dot