Measurement and control of electron wave packets from a single-electron source

TL;DR

This paper presents an experimental method to measure and control the timing and energy of electrons emitted from a semiconductor source, achieving high temporal resolution and enabling manipulation of electron pairs.

Contribution

Introduces a technique for direct measurement and control of electron wave packets from a single-electron source using a fast energy-selective detector.

Findings

Achieved a measurement upper-bound of 30 ps for electron arrival-time distribution.

Demonstrated control over emission-time difference and energy gap between electron pairs.

Validated a tunneling model explaining the emission mechanism.

Abstract

We report an experimental technique to measure and manipulate the arrival-time and energy distributions of electrons emitted from a semiconductor electron pump, operated as both a single-electron source and a two-electron source. Using an energy-selective detector whose transmission we control on picosecond timescales, we can measure directly the electron arrival-time distribution and we determine the upper-bound to the distribution width to be 30 ps. We study the effects of modifying the shape of the voltage waveform that drives the electron pump, and show that our results can be explained by a tunneling model of the emission mechanism. This information was in turn used to control the emission-time difference and energy gap between a pair of electrons.