Impurity scattering and Friedel oscillations in mono-layer black phosphorus
Mesoscale and Nanoscale Physics
2016-07-27 v2
Abstract
We study the effect of impurity scattering effect in black phosphorurene (BP) in this work. For single impurity, we calculate impurity induced local density of states (LDOS) in momentum space numerically based on tight-binding Hamiltonian. In real space, we calculate LDOS and Friedel oscillation analytically. LDOS shows strong anisotropy in BP. Many impurities in BP are investigated using -matrix approximation when the density is low. Midgap states appear in band gap with peaks in DOS. The peaks of midgap states are dependent on impurity potential. For finite positive potential, the impurity tends to bind negative charge carriers and vise versa. The infinite impurity potential problem is related to chiral symmetry in BP.
Keywords
Cite
@article{arxiv.1603.04579,
title = {Impurity scattering and Friedel oscillations in mono-layer black phosphorus},
author = {Y. L. Zou and J. T. Song and C. X. Bai and K. Chang},
journal= {arXiv preprint arXiv:1603.04579},
year = {2016}
}