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Time-resolved Coulomb collision of single electrons.
J D Fletcher1, W Park2, S Ryu3
1National Physical Laboratory, Teddington, UK. jonathan.fletcher@npl.co.uk.
Nature Nanotechnology
|May 11, 2023
Summary
Ballistic electron collisions in semiconductors reveal strong Coulomb interactions, not quantum statistics, preventing wavepacket overlap. These interactions offer new possibilities for high-speed sensing and quantum gate operations.
Area of Science:
- Condensed matter physics
- Quantum electronics
Background:
- Collision experiments with ballistic electrons probe single-electron wavepacket indistinguishability.
- Screening effects have previously obscured Coulomb interactions in such experiments.
Purpose of the Study:
- To investigate Coulomb-dominated collisions of high-energy single electrons in ballistic edge states.
- To analyze partition statistics and collision timing to understand electron interactions.
Main Methods:
- Utilizing counter-propagating ballistic edge states in semiconductors.
- Measuring partition statistics while precisely adjusting collision timing.
- Analyzing electron collision dynamics to differentiate quantum statistics from Coulomb effects.
Main Results:
- Demonstrated Coulomb-dominated collisions between single electrons in ballistic edge states.
- Showed that observed antibunching behavior arises from strong repulsive Coulomb interactions, not quantum statistics.
- Confirmed that Coulomb interactions prevent the necessary wavepacket overlap for fermionic exchange statistics.
Conclusions:
- Strong Coulomb interactions significantly influence ballistic electron collisions, overriding quantum statistical effects.
- Time-resolved, isolated Coulomb interactions between ballistic electrons open avenues for novel applications.
- Potential applications include high-speed sensing and gate operations for flying electron qubits.
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