Possible Indications of Electronic Inhomogeneities in Superconducting Nanowire Detectors
arXiv:1212.3984 · doi:10.1109/TASC.2013.2237935
Abstract
The voltage-carrying state of superconducting NbTiN nanowires, used for single-photon detectors, is analyzed. Upon lowering the current, the wire returns to the superconducting state in a steplike pattern, which differs from sample to sample. Elimination of geometrical inhomogeneities, such as sharp corners, does not remove these steplike features. They appear to be intrinsic to the material. Since the material is strongly disordered, electronic inhomogeneities are considered as a possible cause. A thermal model, taking into account random variations of the electronic properties along the wire, is used as an interpretative framework.
arXiv commentApplied Superconductivity Conference (ASC'12)
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- Characterization of superconducting nanowire single-photon detector with artificial constrictions
- Site-Selective Enhancement of Superconducting Nanowire Single-Photon Detectors via Local Helium Ion Irradiation
- Natural width of the superconducting transition in epitaxial TiN films