Tomographic mapping of the hidden dimension in quasi-particle interference

C. A. Marques, M. S. Bahramy (), C. Trainer, I. Marković, M. D. Watson, F. Mazzola, A. Rajan, T. D. Raub, P. D. C. King and P. Wahl ()
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C. A. Marques: University of St Andrews
M. S. Bahramy: The University of Manchester
C. Trainer: University of St Andrews
I. Marković: University of St Andrews
M. D. Watson: University of St Andrews
F. Mazzola: University of St Andrews
A. Rajan: University of St Andrews
T. D. Raub: University of St Andrews
P. D. C. King: University of St Andrews
P. Wahl: University of St Andrews

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Quasiparticle interference (QPI) imaging is well established to study the low-energy electronic structure in strongly correlated electron materials with unrivalled energy resolution. Yet, being a surface-sensitive technique, the interpretation of QPI only works well for anisotropic materials, where the dispersion in the direction perpendicular to the surface can be neglected and the quasiparticle interference is dominated by a quasi-2D electronic structure. Here, we explore QPI imaging of galena, a material with an electronic structure that does not exhibit pronounced anisotropy. We find that the quasiparticle interference signal is dominated by scattering vectors which are parallel to the surface plane however originate from bias-dependent cuts of the 3D electronic structure. We develop a formalism for the theoretical description of the QPI signal and demonstrate how this quasiparticle tomography can be used to obtain information about the 3D electronic structure and orbital character of the bands.

Date: 2021
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DOI: 10.1038/s41467-021-27082-1

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