Kz selective scattering within quasiparticle interference measurements of FeSe
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Quasiparticle interference (QPI) provides a wealth of information relating to the electronic structure of a material. However, it is often assumed that this information is constrained to two-dimensional electronic states. We show that this is not necessarily the case. For FeSe, a system dominated by surface defects, we show that it is actually all electronic states with negligible group velocity in the z axis that are contained within the experimental data. By using a three-dimensional tight-binding model of FeSe, fit to photoemission measurements, we directly reproduce the experimental QPI scattering dispersion, within a T-matrix formalism, by including both kz=0 and kz=π electronic states. This result unifies both tunnelling based and photoemission based experiments on FeSe and highlights the importance of kz within surface sensitive measurements of QPI.
Rhodes , L C , Watson , M D , Kim , T K & Eschrig , M 2019 , ' K z selective scattering within quasiparticle interference measurements of FeSe ' , Physical Review Letters , vol. 123 , no. 21 , 216404 . https://doi.org/10.1103/PhysRevLett.123.216404
Physical Review Letters
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