Orbital-resolved vortex-core states in FeSe superconductors: A calculation based on a three-orbital model
Q. E. Wang, F. C. Zhang
DOI 10.1103/PhysRevB.91.214509 · Physical Review B
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Abstract
We study the electronic structure of vortex core states of FeSe superconductors based on a t2g three-orbital model by solving the Bogoliubov-de Gennes (BdG) equation self-consistently. The orbital-resolved vortex core states of different pairing symmetries manifest themselves as distinguishable structures due to different quasiparticle wave functions. The obtained vortices are classified in terms of the invariant subgroups of the symmetry group of the mean-field Hamiltonian in the presence of a magnetic field. Isotropic s and anisotropic s-wave vortices have G5 symmetry for each orbital, whereas dx2−y2-wave vortices show G6* symmetry for dxz/yz orbitals and G5* symmetry for dxy orbital. In the case of dx2−y2-wave vortices, hybridized-pairing between dxz and dyz orbitals gives rise to a relative phase difference in terms of gauge transformed pairing order parameters between dxz/yz and dxy orbitals, which is essentially caused by a transformation of co-representation of G5* and G6* subgroups. The calculated local density of states (LDOS) of dx2−y2-wave vortices shows a qualitatively similar pattern with the experimental results. The phase difference of π4 between dxz/yz and dxy orbital-resolved dx2−y2-wave vortices can be verified by further experimental observation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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