Plasmons and screening in a monolayer of MoS$_2$
Abstract
We investigate the dynamical dielectric function of a monolayer of molybdenum disulfide within the random phase approximation. While in graphene damping of plasmons is caused by interband transitions, due to the large direct band gap in monolayer MoS collective charge excitations enter the intraband electron hole continuum similar to the situation in two-dimensional electron and hole gases. Since there is no electron-hole symmetry in MoS, the plasmon energies in p- and n-doped samples clearly differ. The breaking of spin degeneracy caused by the large intrinsic spin-orbit interaction leads to a beating of Friedel oscillations for sufficiently large carrier concentrations, for holes as well as for electrons.
Keywords
Cite
@article{arxiv.1306.1666,
title = {Plasmons and screening in a monolayer of MoS$_2$},
author = {Andreas Scholz and Tobias Stauber and John Schliemann},
journal= {arXiv preprint arXiv:1306.1666},
year = {2013}
}
Comments
7 pages, 8 figures; typos corrected