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.
@article{arxiv.1902.11253,
title = {Trapping and counting ballistic non-equilibrium electrons},
author = {L. Freise and T. Gerster and D. Reifert and T. Weimann and K. Pierz and F. Hohls and N. Ubbelohde},
journal= {arXiv preprint arXiv:1902.11253},
year = {2020}
}