High-resolution spatial mapping of a superconducting NbN wire using single-electron detection

Details High-resolution spatial mapping of a superconducting NbN wire using single-electron detection High-resolution spatial mapping of a superconducting NbN wire using single-electron detection

2009-01-25

arxiv.org/abs/0901.3913v2

Proceedings of 2009 IEEE TIC-STH, page 1011

Physics

Condensed Matter

Superconductivity

2009 IEEE Toronto International Conference, Science and Technology for Humanity (TIC-STH)

Scientific paper

10.1109/TIC-STH.2009.5444534

Superconducting NbN wires have recently received attention as detectors for visible and infrared photons. We present experiments in which we use a NbN wire for high-efficiency (40 %) detection of single electrons with keV energy. We use the beam of a scanning electron microscope as a focussed, stable, and calibrated electron source. Scanning the beam over the surface of the wire provides a map of the detection efficiency. This map shows features as small as 150 nm, revealing wire inhomogeneities. The intrinsic resolution of this mapping method, superior to optical methods, provides the basis of a characterization tool relevant for photon detectors.

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