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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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Near-Monochromatic Tuneable Cryogenic Niobium Electron Field Emitter.

C W Johnson¹, A K Schmid¹, M Mankos²

¹Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA.

Physical Review Letters

|December 23, 2022

Summary

Researchers developed a novel superconducting niobium electron source for quantum technologies. This source provides ultranarrow electron energy distributions, significantly enhancing microscopy and spectroscopy applications.

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Area of Science:

Quantum electron sources
Low-temperature physics
Materials science

Background:

Coherent electron manipulation is crucial for quantum microscopy and spectroscopy.
Altering quantum features of electron beam sources at low temperatures can improve emission properties.

Purpose of the Study:

To describe electron field emission from a monocrystalline, superconducting niobium nanotip.
To characterize the properties of this novel electron source.

Main Methods:

Electron field emission experiments at 5.9 K.
Analysis of emitted electron energy spectrum.
Characterization of emission angle, brightness, and stability.

Main Results:

Achieved ultranarrow electron energy distribution (16 meV) via resonant tunneling.
Observed a cutoff at the low-temperature Fermi edge.
Demonstrated self-focusing emission (3.7°), reduced brightness (3.8×10^8 A/(m^2 sr V)), and stability for hours.

Conclusions:

The superconducting niobium nanotip is a promising electron source for advanced quantum technologies.
The ultranarrow energy width significantly reduces lens aberrations.
Enables new possibilities in low-energy electron microscopy and spectroscopy.