Quasiparticle interference from magnetic impurities
Abstract
Fourier transform scanning tunneling spectroscopy (FT-STS) measures the scattering of conduction electrons from impurities and defects, giving information about the electronic structure of both the host material and adsorbed impurities. We interpret such FT-STS measurements in terms of the quasiparticle interference (QPI), investigating the QPI due to magnetic impurities adsorbed on a range of representative non-magnetic host surfaces, and contrasting with the case of a simple scalar impurity or point defect. We demonstrate how the electronic correlations present for magnetic impurities markedly affect the QPI, showing e.g. a large intensity enhancement due to the Kondo effect, and universality at low temperatures/scanning-energies. The commonly-used joint density of states (JDOS) interpretation of FT-STS measurements is also considered, and shown to be insuffcient in many cases, including that of magnetic impurities.
Cite
@article{arxiv.1503.04712,
title = {Quasiparticle interference from magnetic impurities},
author = {Philip G. Derry and Andrew K. Mitchell and David E. Logan},
journal= {arXiv preprint arXiv:1503.04712},
year = {2015}
}
Comments
18 pages, 12 figures