Orbital Selective Mott Transition Effects and Non-Trivial Topology of Iron Chalcogenide

Abstract

The iron-based superconductor FeSe${}_{1-x}$Te${}_x$ (FST) has recently gained significant attention as a host of two distinct physical phenomena: ($i$) Majorana zero modes which can serve as potential topologically protected qubits, and ($ii$) a realization of the orbital selective Mott transition (OSMT). In this Letter, we connect these two phenomena and provide new insights into the interplay between strong electronic correlations and non-trivial topology in FST. Using linearized quasiparticle self-consistent GW plus dynamical mean-field theory, we show that the topologically protected Dirac surface state has substantial Fe($d_{xy}$) character. The proximity to the OSMT plays a dual role, it facilitates the appearance of the topological surface state by bringing the Dirac cone close to the chemical potential, but destroys the Z${}_2$ topological superconductivity when the system is too close to the orbital selective Mott phase (OSMP). We derive a reduced effective Hamiltonian that describes the topological band. Its parameters capture all the chemical trends found in the first principles calculation. Our findings provide a framework for further study of the interplay between strong electronic correlations and non-trivial topology in other iron-based superconductors.

arXiv comment5 pages, 4 figures, and supplemental material

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• Fragility of Topology under Electronic Correlations in Iron Chalcogenides
• Photomagnetic-Chiral Anisotropy mediated by Chirality-Driven Asymmetric Spin Splitting
• Evolution of the intertwining correlated topological phases in iron-based superconductor Fe(Te,Se)
• Orbital-Selective Spin-Orbit Mott Insulator in Fractional Valence Iridate La${}_3$Ir${}_3$O${}_{11}$
• Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2
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• Layer controlled orbital selective Mott transition in monolayer nickelate