Non-local Andreev reflection under ac bias

Abstract

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.

published version, 6 pages, 3 figures

References in corpus (10)

• Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
• Reversing non-local transport through a superconductor by electromagnetic excitations
• Sign of the crossed conductances at a FSF double interface
• Non-local Andreev transport through an interacting quantum dot
• Nonlocal Andreev reflection at high transmissions
• Crossed Andreev reflection in diffusive contacts
• Non-local Andreev reflection in superconducting quantum dots
• Full counting statistics of crossed Andreev reflection
• Self-consistent microscopic calculations for non-local transport through nanoscale superconductors
• Spin-resolved crossed Andreev reflection in ballistic heterostructures