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Measuring superconducting arcs by angle-resolved photoemission spectroscopy

A. Kuibarov1,*, S. Changdar1, A. Fedorov1,2,3, R. Lou1,2,3, O. Suvorov1, V. Misheneva2,3, L. Harnagea1,4, I. Kovalchuk5, S. Wurmehl1 et al.

B. Büchner1,6 and S. Borisenko1

  • *Contact author: a.kuibarov@ifw-dresden.de
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Phys. Rev. B 112, 144518 – Published 27 October, 2025

DOI: https://doi.org/10.1103/5q36-wgl9

Abstract

Angle-resolved photoemission spectroscopy is the leading tool for studying the symmetry and structure of the order parameter in superconductors. The recent improvement of the technique made it possible to detect the superconducting energy gap at the surface of topological t-PtBi2 via observation of the record-breaking narrow line shapes. The promising new physics uncovered requires further investigation of the spectral and gap functions of t-PtBi2, but the challenging experimental conditions severely limit the application of conventional ARPES setups. In this work, we use synchrotron-based measurements and show that the gap at the surface Fermi arc in t-PtBi2 can be detected even with more relaxed experimental conditions than in our previous laser-based studies. At the same time, using simple model of ARPES spectra, we identify the minimum requirements to detect the gap and consider cases where the gap cannot be resolved.

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References (19)

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Phys. Rev. B 112, 144518– Published 27 October, 2025
  • Received 14 May 2025
  • Revised 2 September 2025
  • Accepted 23 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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