Kz selective scattering within quasiparticle interference measurements of FeSe

Luke C. Rhodes, Matthew D. Watson, Timur K. Kim, Matthias Eschrig

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Article number216404
Number of pages6
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 22 Nov 2019


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