Classification of Symmetry Derived Pairing at M Point in FeSe

Abstract

Using the constraints imposed by the crystalline symmetry of FeSe and the experimentally observed phenomenology, we analyze the possible pairing symmetry of the superconducting order parameter focusing on intercalated and monolayer FeSe compounds. Such analysis leads to three possible pairing symmetry states -- s-wave, d-wave, and helical p-wave. Despite the differences in the pairing symmetry, each of these states is fully gapped with gap minimum centered above the normal state Fermi surface, in agreement with photoemission data of Y. Zhang et al. The analysis provides additional insights into the possible pairing mechanism for each of these states, highlighting the detrimental role of the renormalized repulsive intra-orbital Hubbard $U$ and inter-orbital $U^{\prime }$ , and the beneficial role of the pair hopping $J^{\prime }$ and the Hunds $J$ terms, as well as the spin-orbit coupling in the effective low-energy Hamiltonian.

arXiv comment17 pages, 13 figures. Minor corrections in order to match PRB publication, this includes: removed erroneous citation, added citation, minor corrections to wordings, and added paragraph. Further, the author corrected the pairing symmetry of the inter-band spin-triplet (w/ d-vector out of plane) pairs in Table III. This was a labeling mistake and has no impact on the rest of the paper

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Cited by in corpus (13)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Topological Ultranodal pair states in iron-based superconductors
• Bogoliubov Fermi Surfaces in Spin-1/2 Systems: Model Hamiltonians and Experimental Consequences
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• FeSe and the missing electron pocket problem
• Twisted-bilayer FeSe and the Fe-based superlattices
• Nodal topology in $d$-wave superconducting monolayer FeSe
• Quasiparticle Interference and Symmetry of Superconducting Order Parameter in Strongly Electron-Doped Iron-based Superconductors
• Superconductivity by Hidden Spin Fluctuations in Electron-Doped Iron Selenide
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements