Non-Poissonian ultrashort, nanoscale electron pulses
Sam Keramati, Will Brunner, T. J. Gay, Herman Batelaan
TL;DR
This paper reports the observation of non-Poissonian, sub-Poissonian electron statistics in femtosecond pulsed electron pairs, demonstrating Coulomb interaction effects and anti-bunching, advancing quantum electron beam applications.
Contribution
It presents the first experimental evidence of non-Poissonian electron statistics caused by Coulomb interactions in ultrashort electron pulses.
Findings
Observation of sub-Poissonian electron statistics
Detection of anti-bunching signal of 1 part in 4
Advancement towards quantum degenerate electron beams
Abstract
The statistical character of electron beams used in current technologies, as described by a stream of particles, is random in nature. Using coincidence measurements of femtosecond pulsed electron pairs, we report the observation of sub-Poissonian electron statistics that are non-random due to two-electron Coulomb interactions, and that exhibit an anti-bunching signal of 1 part in 4. This advancement is a fundamental step towards realizing a strongly quantum degenerate electron beam needed for many applications, and in particular electron correlation spectroscopy.
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