Critical Josephson current through a bistable single-molecule junction

Details Critical Josephson current through a bistable single-molecule junction Critical Josephson current through a bistable single-molecule junction

2009-03-11

arxiv.org/abs/0903.2007v2

Phys. Rev. B 79, 184517 (2009)

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures; v2: minor changes, to be published in Phys. Rev. B

Scientific paper

We compute the critical Josephson current through a single-molecule junction. As a model for a molecule with a bistable conformational degree of freedom, we study an interacting single-level quantum dot coupled to a two-level system and weakly connected to two superconducting electrodes. We perform a lowest-order perturbative calculation of the critical current and show that it can significantly change due to the two-level system. In particular, the \pi-junction behavior, generally present for strong interactions, can be completely suppressed.

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