Diagnosis of pairing symmetry by vortex and edge spectra in kagome superconductors

Peize Ding, Ching Hua Lee, Xianxin Wu, and Ronny Thomale
Phys. Rev. B 105, 174518 – Published 26 May 2022

Abstract

Layered kagome metals AV3Sb5 (A=K,Rb,Cs) exhibit diverse correlated electron phenomena. They include charge density wave formation and superconductivity, the pairing symmetry of which, however, is controversial due to contradictory experimental evidence. Through calculations based on real-space lattice models at the mean-field level, we investigate the vortex and surface spectra of all competitive pairing propensities suggested for AV3Sb5 from a weak-coupling analysis of unconventional superconductivity. Chiral p-wave pairing emerges as the only option to host Majorana bound states in the vortex core. We find chiral edge states for both p-wave and d-wave pairing, along with flat Andreev surface bound states for f-wave pairing. Our results expand the fingerprint of superconducting pairing and thus will contribute to resolving the nature of superconductivity in AV3Sb5.

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  • Received 7 February 2022
  • Revised 6 May 2022
  • Accepted 16 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.174518

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Peize Ding1,2,*, Ching Hua Lee3, Xianxin Wu4,5,†, and Ronny Thomale1,‡

  • 1Institute for Theoretical Physics, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 2School of the Gifted Young, University of Science and Technology of China, Hefei 230026, China
  • 3Department of Physics, National University of Singapore, Singapore 117542, Singapore
  • 4Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 5CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

  • *peize18@mail.ustc.edu.cn
  • xianxin.wu@fkf.mpg.de
  • rthomale@physik.uni-wuerzburg.de

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Issue

Vol. 105, Iss. 17 — 1 May 2022

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