Coherent Electronic Lensing in Proximitized Graphene
Abstract
Spatially resolved control of coherent electron transport offers a route to understanding and engineering interference phenomena in hybrid superconducting devices. Here, we use Scanning Gate Microscopy (SGM) to investigate Fabry-Pérot (FP) interference in the n-p-n cavity of a ballistic graphene Josephson junction. Spatial maps of the superconducting switching current and normal-state conductance reveal circular interference fringes arising from two distinct effects of the SGM tip potential. A global shift of the Fermi wave vector modulates the FP resonances of the cavity, while a local perturbation produces additional oscillations that persist at fixed Fermi wave vector as the tip bias is varied. An analytical model identifies the origin of this local response with coherent electron lensing, in which the tip modifies the phase accumulated along interfering trajectories. The measured fringe patterns in the switching current indicate that this mechanism affects superconducting transport, consistent with tip-induced shifts of the resonance conditions for Andreev bound states. These results establish SGM as a tunable local lens for controlling interference in superconducting ballistic graphene devices.
Related
- Edge state reconstruction in proximitized graphene and its probe using RKKY interaction
- Electronic transport in hBN-encapsulated graphene limited by remote phonon scattering
- Direct observation of the electronic structure of even-layer puckered SnTe monolayer films on graphene
- Electronic properties and topological aspects of graphene nanohelicoids
- Detection Defines Dephasing in Two-Dimensional Electronic Spectroscopy of Materials: Coherent Field Emission versus Incoherent Population Observables
BibTeX
@misc{villani2026coherent,
title = {{Coherent Electronic Lensing in Proximitized Graphene}},
author = {Ivan Villani and Samuele Fracassi and Niccolò Traverso Ziani and Maura Sassetti and Matteo Carrega and Vaidotas Mišeikis and Camilla Coletti and Fabio Beltram and Kenji Watanabe and Takashi Taniguchi and Sergio Pezzini and Stefan Heun},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38476},
eprint = {2610.38476},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38476},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coherent Electronic Lensing in Proximitized Graphene
AU - Ivan Villani
AU - Samuele Fracassi
AU - Niccolò Traverso Ziani
AU - Maura Sassetti
AU - Matteo Carrega
AU - Vaidotas Mišeikis
AU - Camilla Coletti
AU - Fabio Beltram
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Sergio Pezzini
AU - Stefan Heun
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38476
UR - https://arxiv.org/abs/2610.38476
AB - Spatially resolved control of coherent electron transport offers a route to understanding and engineering interference phenomena in hybrid superconducting devices. Here, we use Scanning Gate Microscopy (SGM) to investigate Fabry-Pérot (FP) interference in the n-p-n cavity of a ballistic graphene Josephson junction. Spatial maps of the superconducting switching current and normal-state conductance reveal circular interference fringes arising from two distinct effects of the SGM tip potential. A global shift of the Fermi wave vector modulates the FP resonances of the cavity, while a local perturbation produces additional oscillations that persist at fixed Fermi wave vector as the tip bias is varied. An analytical model identifies the origin of this local response with coherent electron lensing, in which the tip modifies the phase accumulated along interfering trajectories. The measured fringe patterns in the switching current indicate that this mechanism affects superconducting transport, consistent with tip-induced shifts of the resonance conditions for Andreev bound states. These results establish SGM as a tunable local lens for controlling interference in superconducting ballistic graphene devices.
ER -