Proposal for the observation of nonlocal multipair production: the biSQUID

Autor: Rech, J., Jonckheere, T., Martin, T., Douçot, B., Feinberg, D., Mélin, R.
Rok vydání: 2014
Předmět:
Zdroj: Phys. Rev. B 90, 075419 (2014)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevB.90.075419
Popis: We propose an all-superconducting three-terminal setup consisting in a carbon nanotube (or semiconducting nanowire) contacted to three superconducting leads. The resulting device, referred to as a "biSQUID", is made of four quantum dots arranged in two loops of different surface area. We show how this biSQUID can prove a useful tool to probe nonlocal quantum phenomena in an interferometry setup. We study the measured critical current as a function of the applied magnetic field, which shows peaks in its Fourier spectrum, providing clear signatures of multipair Josephson processes. The device does not require any specific fine-tuning as these features are observed for a wide range of microscopic parameters -- albeit with a non-trivial dependence. Competing effects which may play a significant role in actual experimental realizations are also explored.
Comment: 13 pages, 9 figures
Databáze: arXiv