Oscillator model approximation applied to 2D materials: Energy loss of relativistic charged particles

Abstract

In this work we present a fully relativistic formulation for the energy loss of an external charged particle interacting with a 2D material. We model this material as a monolayer of atoms represented by harmonic oscillators, with isotropic or anisotropic electronic vibration modes. We develop the model for a wide range of incident energies and considering both parallel and perpendicular trajectories.