Emergence of a negative charging energy in a metallic dot capacitively coupled to a superconducting island

Details Emergence of a negative charging energy in a metallic dot capacitively coupled to a superconducting island Emergence of a negative charging energy in a metallic dot capacitively coupled to a superconducting island

2007-03-15

arxiv.org/abs/cond-mat/0703412v5

Physical Review B 77 (2008) 054517

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revised version, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.054517

We consider the hybrid setup formed by a metallic dot, capacitively coupled to a superconducting island S connected to a bulk superconductor by a Josephson junction. Charge fluctuations in S act as a dynamical gate and overscreen the electronic repulsion in the metallic dot, producing an attractive interaction between two additional electrons. As the offset charge of the metallic dot is increased, the dot charging curve shows positive steps ($+2e$) followed by negative ones ($-e$) signaling the occurrence of a negative differential capacitance. A proposal for experimental detection is given, and potential applications in nanoelectronics are mentioned.

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