Proposal for the observation of nonlocal multipair production: the biSQUID
Autor: | Rech, J., Jonckheere, T., Martin, T., Douçot, B., Feinberg, D., Mélin, R. |
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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 |
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