Non-local Andreev reflection under ac bias

Details Non-local Andreev reflection under ac bias Non-local Andreev reflection under ac bias

2009-02-17

arxiv.org/abs/0902.2864v2

Europhys. Lett. 86, 37009 (2009)

Physics

Condensed Matter

Superconductivity

published version, 6 pages, 3 figures

Scientific paper

10.1209/0295-5075/86/37009

We theoretically analyze non-local electron transport in multi-terminal normal-metal-superconductor-normal-metal (NSN) devices in the presence of an external ac voltage bias. Our analysis reveals a number of interesting effects, such as, e.g., photon-assisted violation of balance between crossed Andreev reflection (CAR) and elastic cotunneling (EC). We demonstrate that at sufficiently small (typically subgap) frequencies of an external ac signal and at low temperatures the non-local conductance of the NSN device turns negative implying that in this regime CAR contribution to the non-local current dominates over that of EC. Our predictions can be directly tested in future experiments.

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