Topological crystalline superconductivity in Dirac semimetal phase of iron-based superconductors
Takuto Kawakami, Masatoshi Sato
DOI 10.1103/PhysRevB.100.094520 · Physical Review B
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Abstract
In iron-based superconductors, band inversion of d and p orbitals yields Dirac semimetallic states. We theoretically investigate their topological properties in normal and superconducting phases based on the tight-binding model involving full symmetry of the materials. We demonstrate that a Cooper pair between electrons with d and p orbitals relevant to the band structure yields odd-parity superconductivity. Moreover, we present the typical surface states by solving the Bogoliubov–de Gennes equation and characterize them by topological invariants defined with crystal symmetry. It is found that there appear various types of Majorana fermions such as surface flat band, Majorana quartet, and Möbius twisted surface states. Our theoretical results show that iron-based superconductors are promising platforms to realize rich topological crystalline phases.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe(Se,Te) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
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