Electronic stopping power in insulators from first principles
Materials Science
2009-11-13 v2
Abstract
Using time-dependent density-functional theory we calculate from first principles the rate of energy transfer from a moving proton or antiproton to the electrons of an insulating material, LiF. The behavior of the electronic stopping power versus projectile velocity displays an effective threshold velocity of ~0.2 a.u. for the proton, consistent with recent experimental observations, and also for the antiproton. The calculated proton/antiproton stopping-power ratio is ~2.4 at velocities slightly above the threshold (v~0.4 a.u.), as compared to the experimental value of 2.1. The projectile energy loss mechanism is observed to be stationary and extremely local.
Keywords
Cite
@article{arxiv.0706.1803,
title = {Electronic stopping power in insulators from first principles},
author = {J. M. Pruneda and D. Sanchez-Portal and A. Arnau and J. I. Juaristi and Emilio Artacho},
journal= {arXiv preprint arXiv:0706.1803},
year = {2009}
}