Pseudomagnetic field modulation of stopping power for a charged particle moving above graphene

摘要

We use a linearized two-component hydrodynamic model to study the wake potential and stopping power of electrons in a strained graphene sheet with a charged particle moving above it. The self-consistent numerical solution indicates the existence of surface plasmons due to a strain-induced pseudomagnetic field and Coulomb interactions. The wake potential is induced under this interaction, and the stopping power is calculated in terms of the wake potential. The influence on the wake potential, stopping function, and stopping power of the pseudomagnetic field, intrusive particle velocity and distance, and wave number and frequency are shown and discussed. The results indicate that the stopping power obviously differs for different materials in both cases with and without magnetic modulation. Moreover, the pseudomagnetic field modulation is significant in graphene. This feature is not captured for a free-electron gas on a semiconductor heterostructure. Our hydrodynamic results quantitatively agree with those obtained by a local-frequency-dependent dielectric method. Published by AIP Publishing.