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k z selective scattering within quasiparticle interference measurements of FeSe

DOI: 10.1103/PhysRevLett.123.216404 DOI Help

Authors: Luke Rhodes (Royal Holloway, University of London; Diamond Light Source; University of St. Andrews) , Matthew Watson (University of St. Andrews) , Timur K. Kim (Diamond Light Source) , Matthias Eschrig (Royal Holloway, University of London; University of Greifswald)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 123

State: Published (Approved)
Published: November 2019

Abstract: 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.

Journal Keywords: Electronic structure; Iron-based superconductors; Green's function methods; Scanning tunneling microscopy; Tight-binding model; X-ray photoelectron spectroscopy

Subject Areas: Materials, Physics

Technical Areas: