Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors

Abstract

The effect of impurities on a superconductor with Bogoliubov Fermi surfaces (BFSs) is studied using a realistic tight-binding model. Based on the band structure composed of $d$-orbitals in tetragonal FeSe, whose S-doped sample is a potential material for BFS, we construct the superconducting state by introducing a time-reversal broken pair potential in terms of the band index. We further consider the effect of impurities on the BFS, where the impurity potential is defined as a local potential for the original $d$-orbitals. The self-energy is calculated using the (self-consistent) Born approximation, which shows an enhancement of the single-particle spectral weight on the Fermi surface. This is consistent with the previous phenomenological theory and is justified by the present more detailed calculation based on the FeSe-based material.

14 pages, 6 figures

References in corpus (10)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Bogoliubov Fermi surfaces in superconductors with broken time-reversal symmetry
• Exotic Superconducting States in FeSe-based Materials
• Breached Superfluidity via P-Wave Coupling
• Superconductivity in spin-$3/2$ systems: symmetry classification, odd-frequency pairs, and Bogoliubov Fermi surfaces
• Electronic multipoles and multiplet pairs induced from Pomeranchuk and Cooper instabilities of Bogoliubov Fermi surfaces
• Symmetry, nodal structure, and Bogoliubov Fermi surfaces for nonlocal pairing
• Distortional weak-coupling instability of Bogoliubov Fermi surfaces
• Quasiparticle on Bogoliubov Fermi Surface and Odd-Frequency Cooper Pair
• Gapless Surfaces in Anisotropic Superfluids

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• Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx
• Odd-frequency pairing of Bogoliubov quasiparticles in superconductor junction
• Evolution and Instability of Bogoliubov Fermi Surfaces under Zeeman Field