| Autor: |
Rhodes LC; Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.; Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom.; School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom., Watson MD; School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom., Kim TK; Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom., Eschrig M; Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.; Institute of Physics, University of Greifswald, Felix-Hausdorff-Strasse 6, 17489 Greifswald, Germany. |
| Abstrakt: |
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 k_{z}=0 and k_{z}=π electronic states. This result unifies both tunnelling based and photoemission based experiments on FeSe and highlights the importance of k_{z} within surface sensitive measurements of QPI. |
