CONFERENCES AND SYMPOSIA: Coulomb effects in a ballistic onechannel SSS device
Abstract
We develop a theory of Coulomb oscillations in superconducting devices in the limit of small charging energy $E_C \ll \Delta$. We consider a small superconducting grain of finite capacity connected to two superconducting leads by nearly ballistic singlechannel quantum point contacts. The temperature is supposed to be very low, so there are no singleparticle excitations on the grain. Then the behavior of the system may be described as quantum mechanics of the superconducting phase on the island. The Josephson energy as a function of this phase has two minima which become degenerate at the phase difference on the leads equal to $\pi$, the tunneling amplitude between them being controlled by the gate voltage at the grain. We find the Josephson current and its lowfrequency fluctuations and predict their periodic dependence on the induced charge $Q_x=C V_g$ with period $2e$.
 Publication:

Physics Uspekhi
 Pub Date:
 February 1998
 DOI:
 10.1070/PU1998v041n02ABEH000363
 arXiv:
 arXiv:condmat/9712074
 Bibcode:
 1998PhyU...41..197I
 Keywords:

 Condensed Matter
 EPrint:
 11 pages, REVTeX, 10 figures, uses epsf