Abstract
We investigate transport of Cooper pairs through a double quantum dot in the Kondo regime and coupled to superconducting leads. Within the nonperturbative slave boson mean-field theory we evaluate the Josephson current for two different configurations, the double quantum dot coupled in parallel and in series to the leads. We find striking differences between these configurations in the supercurrent versus the ratio t Γ, where t is the interdot coupling and Γ is the coupling to the leads: the critical current Ic decreases monotonously with t Γ for the parallel configuration whereas Ic exhibits a maximum at t Γ=1 in the serial case. These results demonstrate that a variation of the ratio t Γ enables one to control the flow of supercurrent through the Kondo resonance of the double quantum dot.
| Original language | English |
|---|---|
| Article number | 045132 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 75 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2007 Jan 30 |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Josephson current through a Kondo molecule. / López, Rosa; Choi, Mahn-Soo; Aguado, Ramón.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 75, No. 4, 045132, 30.01.2007.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Josephson current through a Kondo molecule
AU - López, Rosa
AU - Choi, Mahn-Soo
AU - Aguado, Ramón
PY - 2007/1/30
Y1 - 2007/1/30
N2 - We investigate transport of Cooper pairs through a double quantum dot in the Kondo regime and coupled to superconducting leads. Within the nonperturbative slave boson mean-field theory we evaluate the Josephson current for two different configurations, the double quantum dot coupled in parallel and in series to the leads. We find striking differences between these configurations in the supercurrent versus the ratio t Γ, where t is the interdot coupling and Γ is the coupling to the leads: the critical current Ic decreases monotonously with t Γ for the parallel configuration whereas Ic exhibits a maximum at t Γ=1 in the serial case. These results demonstrate that a variation of the ratio t Γ enables one to control the flow of supercurrent through the Kondo resonance of the double quantum dot.
AB - We investigate transport of Cooper pairs through a double quantum dot in the Kondo regime and coupled to superconducting leads. Within the nonperturbative slave boson mean-field theory we evaluate the Josephson current for two different configurations, the double quantum dot coupled in parallel and in series to the leads. We find striking differences between these configurations in the supercurrent versus the ratio t Γ, where t is the interdot coupling and Γ is the coupling to the leads: the critical current Ic decreases monotonously with t Γ for the parallel configuration whereas Ic exhibits a maximum at t Γ=1 in the serial case. These results demonstrate that a variation of the ratio t Γ enables one to control the flow of supercurrent through the Kondo resonance of the double quantum dot.
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U2 - 10.1103/PhysRevB.75.045132
DO - 10.1103/PhysRevB.75.045132
M3 - Article
VL - 75
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 4
M1 - 045132
ER -