Collective excitations of Dirac electrons in a graphene layer with spin-orbit interaction
Mesoscale and Nanoscale Physics
2015-06-25 v2
Abstract
Coulomb screening and excitation spectra of electrons in a graphene layer with spin-orbit interaction (SOI) is studied in the random phase approximation. The SOI opens a gap between the valence and conduction bands of the semi-metal Dirac system and reshapes the bottom and top of the bands. As a result, we have observed a dramatic change in the long-wavelength dielectric function of the system. An undamped plasmon mode emerges from the inter-band electron-hole excitation continuum edge and vanishes or merges with a Landau damped mode on the edge of the intra-band electron-hole continuum. The characteristic collective excitation of the Dirac gas is recovered in a system with high carrier density or for a large wave vector.
Keywords
Cite
@article{arxiv.cond-mat/0605498,
title = {Collective excitations of Dirac electrons in a graphene layer with spin-orbit interaction},
author = {X. F. Wang and Tapash Chakraborty},
journal= {arXiv preprint arXiv:cond-mat/0605498},
year = {2015}
}