Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-11-15
Phys. Rev. B 83, 125421 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1103/PhysRevB.83.125421
We consider a double quantum dot coupled to two normal leads and one superconducting lead, modeling the Cooper pair beam splitter studied in two recent experiments. Starting from a microscopic Hamiltonian we derive a general expression for the branching current and the noise crossed correlations in terms of single and two-particle Green's function of the dot electrons. We then study numerically how these quantities depend on the energy configuration of the dots and the presence of direct tunneling between them, isolating the various processes which come into play. In absence of direct tunneling, the antisymmetric case (the two levels have opposite energies with respect to the superconducting chemical potential) optimizes the Crossed Andreev Reflection (CAR) process while the symmetric case (the two levels have the same energies) favors the Elastic Cotunneling (EC) process. Switching on the direct tunneling tends to suppress the CAR process, leading to negative noise crossed correlations over the whole voltage range for large enough direct tunneling.
Chevallier Denis
Jonckheere Th.
Martin Tara
Rech Jason
No associations
LandOfFree
Current and noise correlations in a double dot Cooper pair beam splitter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Current and noise correlations in a double dot Cooper pair beam splitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current and noise correlations in a double dot Cooper pair beam splitter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-299123