Probing single-electron scattering through a non-Fermi liquid charge-Kondo device

TL;DR

This paper proposes an experimental setup using a charge-Kondo device within a Mach-Zehnder interferometer to observe unique non-Fermi liquid single-electron scattering features predicted by multi-channel Kondo models.

Contribution

It introduces a method to directly observe sub-unitary single-electron scattering in a charge-Kondo device, providing detailed predictions for interference patterns based on channel coupling.

Findings

Predicted visibility and phase shifts of Aharonov-Bohm oscillations.

Demonstrated the potential to observe non-Fermi liquid behavior.

Outlined dependence on channel number and coupling asymmetry.

Abstract

Among the exotic and yet unobserved features of multi-channel Kondo impurity models is their sub-unitary single electron scattering. In the two-channel Kondo model, for example, an incoming electron is fully scattered into a many-body excitation such that the single particle Green function vanishes. Here we propose to directly observe these features in a charge-Kondo device encapsulated in a Mach-Zehnder interferometer - within a device already studied in Ref.[1]. We provide detailed predictions for the visibility and phase of the Aharonov-Bohm oscillations depending on the number of coupled channels and the asymmetry of their couplings.