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

Cecilia Holmqvist (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Denis Feinberg ; A. Zazunov
Phys. Rev. B (1098-0121). Vol. 77 (2008), p. 054517.
[Artikel, refereegranskad vetenskaplig]

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 charge-skipping positive steps (+2|e|) followed by negative ones (−|e|) signaling the occurrence of a negative differential capacitance. A necessary condition for such an effect is that the capacitance coupling the two islands should be larger than the Josephson junction capacitance. A proposal for experimental detection is given, and potential applications in nanoelectronics are outlined.

Nyckelord: capacitance; electric charge; fluctuations; Josephson effect



Denna post skapades 2008-04-08.
CPL Pubid: 69922

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur

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