English

Disentangling bulk and surface states in the electronic structure of PtBi$_2$(0001)

Strongly Correlated Electrons 2026-07-29 v1 Materials Science
Authors: Stefanie Suzanne Brinkman , Xin Liang Tan , Anders Christian Mathisen , Fabian Göhler , Øyvind Finnseth , Chul-Hee Min , Grigory Shipunov , Falk Pabst , Manuel Alonso Lemos , Balasubramanian Thiagarajan , Craig Polley , Masashi Arita , Kenya Shimada , Anna Isaeva , Jorge I. Facio , Hendrik Bentmann
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Abstract

Recent reports of surface-localized topological superconductivity in trigonal PtBi2_2 highlight the importance of understanding its surface electronic structure. We investigate the bulk and surface band structure of PtBi2_2 using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. Through photon-energy- and polarization-dependent measurements, we disentangle bulk dispersions from surface states on the two distinct surface terminations of PtBi2_2(0001). For both terminations, we assign several different surface states and find good agreement between experiment and calculations. Based on our calculations, we analyze the orbital composition in the surface and bulk bands and compare the results to polarization-dependent ARPES measurements. Together, our results provide a coherent picture of the surface electronic structure of PtBi2_2 across both surface terminations.

Keywords

PtBi2 surface states ARPES first-principles calculations topological superconductor band structure

Cite

@article{arxiv.2607.26804,
  title  = {Disentangling bulk and surface states in the electronic structure of PtBi$_2$(0001)},
  author = {Stefanie Suzanne Brinkman and Xin Liang Tan and Anders Christian Mathisen and Fabian Göhler and Øyvind Finnseth and Chul-Hee Min and Grigory Shipunov and Falk Pabst and Manuel Alonso Lemos and Balasubramanian Thiagarajan and Craig Polley and Masashi Arita and Kenya Shimada and Anna Isaeva and Jorge I. Facio and Hendrik Bentmann},
  journal= {arXiv preprint arXiv:2607.26804},
  year   = {2026}
}