Direct observation of the vanishing electron energy loss spectroscopy cross section in graphene

Autor(en)

Alberto Guandalini, Ryosuke Senga, Yung Chang Lin, Kazu Suenaga, Paolo Barone, Francesco Mauri, Thomas Pichler, Christian Kramberger

Abstrakt

In transmission electron energy loss (EEL) spectroscopy, the cross section in two dimensions (2D) is quenched by kinematic effects once the momentum transfer becomes smaller than a critical value set by qz, the momentum loss parallel to the beam. Our highly momentum (Δq=0.02Å-1) and energy (ΔE=45 meV) resolved setup is instrumental in delivering the experimental verification of quenched 2D EEL spectra on freestanding graphene at momentum transfers q below 0.06Å-1. We retrieve the intrinsic uniform dielectric response of graphene from measured spectra by quantifying the kinematic suppression.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Università degli Studi di Roma La Sapienza, National Institute of Advanced Industrial Science and Technology (AIST), Osaka University, Consiglio Nazionale delle Ricerche

Journal

Physical Review B

Band

111

Anzahl der Seiten

6

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.111.L041401

Publikationsdatum

01-2025

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a921ed8d-b804-4454-82d8-7f6fcb369b96