Trapping and Counting Ballistic Nonequilibrium Electrons

authored by: Lars Freise, Thomas Gerster, David Reifert, Thomas Weimann, Klaus Pierz, Frank Hohls, Niels Ubbelohde
Abstract: We demonstrate the trapping of electrons propagating ballistically at far-above-equilibrium energies in GaAs/AlGaAs heterostructures in high magnetic field. We find low-loss transport along a gate-modified mesa edge in contrast to an effective decay of excess energy for the loop around a neighboring, mesa-confined node, enabling high-fidelity trapping. Measuring the full counting statistics via single-charge detection yields the trapping (and escape) probabilities of electrons scattered (and excited) within the node. Energetic and arrival-time distributions of captured electron wave packets are characterized by modulating tunnel barrier transmission.
External Organisation(s): National Metrology Institute of Germany (PTB)
Type: Article
Journal: Physical review letters
Volume: 124
ISSN: 0031-9007
Publication date: 27.03.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.1103/PhysRevLett.124.127701 (Access: Open)

BibTeX

@article{271122b7cc85454986a8f99f54bfbd67,
title = "Trapping and Counting Ballistic Nonequilibrium Electrons",
abstract = "We demonstrate the trapping of electrons propagating ballistically at far-above-equilibrium energies in GaAs/AlGaAs heterostructures in high magnetic field. We find low-loss transport along a gate-modified mesa edge in contrast to an effective decay of excess energy for the loop around a neighboring, mesa-confined node, enabling high-fidelity trapping. Measuring the full counting statistics via single-charge detection yields the trapping (and escape) probabilities of electrons scattered (and excited) within the node. Energetic and arrival-time distributions of captured electron wave packets are characterized by modulating tunnel barrier transmission.",
author = "Lars Freise and Thomas Gerster and David Reifert and Thomas Weimann and Klaus Pierz and Frank Hohls and Niels Ubbelohde",
note = "Funding information: We gratefully acknowledge MBE operation by H. Marx and discussions with D. Maradan and V. Kashcheyevs. This work was supported in part by the Joint Research Project “SEQUOIA” (17FUN04). This project has received funding from the European Metrology Programme for Innovation and Research (EMPIR) co-financed by the Participating States and from the European Union{\textquoteright}s Horizon 2020 research and innovation programme. We additionally acknowledge support by DFG within cluster of excellence EXC-2123 “QuantumFrontiers” – 390837967.",
year = "2020",
month = mar,
day = "27",
doi = "10.1103/PhysRevLett.124.127701",
language = "English",
volume = "124",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "12",
}