Interaction of charged particles with a graphene monolayer modeled as a set of electronic oscillators

SILVINA SEGUI; J L GERVASONI; MISKOVIC, ZORAN L; N. R. ARISTA

JOURNAL OF APPLIED PHYSICS

AMER INST PHYSICS

Lugar: New York; Año: 2021 vol. 130 p. 114302 - 114302

0021-8979

We assess the applicability of the oscillator model to evaluating the energy loss of a fast charged particle incident on graphene. We study the cases of a parallel and perpendicular trajectory of the particle. We focus on two frequency regimes for graphene?s electron response: the optical regime, which is dominated by two types of oscillators withnon-dispersing frequencies in the ultraviolet regime, and the terahertz regime (THz), which is dominated by a strongly dispersing sheet plasmon mode in doped graphene. In the latter regime, we invoke the kinematic resonance condition for a parallel trajectory, and we propose a method for averaging the energy loss for a perpendicular trajectory. Weshow that the oscillator model provides analytical expressions, which give results in generally good agreement with a  dielectric-response approach to the same problem, even in the THz regime.