Quantum mechanics of superconducting nanowires

Details Quantum mechanics of superconducting nanowires Quantum mechanics of superconducting nanowires

2008-03-06

arxiv.org/abs/0803.0975v4

Phys. Rev. B 78, 014512 (2008)

Physics

Condensed Matter

Superconductivity

6 pages, 1 figure; published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.014512

In a short superconducting nanowire connected to bulk superconducting leads, quantum phase slips behave as a system of linearly (as opposed to logarithmically) interacting charges. This system maps onto quantum mechanics of a particle in a periodic potential. We show that, while the state with a high density of phase slips is not a true insulator (a consequence of Josephson tunneling between the leads), for a range of parameters it behaves as such down to unobservably small temperatures. We also show that quantum phase slips give rise to multiple branches (bands) in the energy-current relation and to an interband ("exciton") mode.

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