Controllable pi junction in a Josephson quantum-dot device with molecular spin

Details Controllable pi junction in a Josephson quantum-dot device with molecular spin Controllable pi junction in a Josephson quantum-dot device with molecular spin

2006-05-12

arxiv.org/abs/cond-mat/0605338v4

European Physical Journal B 57 (13/06/2007) 279-289

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1140/epjb/e2007-00167-6

We consider a model for a single molecule with a large frozen spin sandwiched in between two BCS superconductors at equilibrium, and show that this system has a $\pi$ junction behavior at low temperature. The $\pi$ shift can be reversed by varying the other parameters of the system, e.g., temperature or the position of the quantum dot level, implying a controllable $\pi$ junction with novel application as a Josephson current switch. We show that the mechanism leading to the $\pi$ shift can be explained simply in terms of the contributions of the Andreev bound states and of the continuum of states above the superconducting gap. The free energy for certain configuration of parameters shows a bistable nature, which is a necessary pre-condition for achievement of a qubit.

Affiliated with

Also associated with

No associations

Rating

Controllable pi junction in a Josephson quantum-dot device with molecular spin 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 Controllable pi junction in a Josephson quantum-dot device with molecular spin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controllable pi junction in a Josephson quantum-dot device with molecular spin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-596347