Topological superconducting states in monolayer FeSe/SrTiO${}_3$

Abstract

The monolayer FeSe with a thickness of one unit cell grown on a single-crystal SrTiO${}_3$ substrate (FeSe/STO) exhibits striking high-temperature superconductivity with transition temperature $T_c$ over 65K reported by recent experimental measurements. In this work, through analyzing the distinctive electronic structure, and providing systematic classification of the pairing symmetry , we find that both $s$-and $p$-wave pairing with odd parity give rise to topological superconducting states in monolayer FeSe, and the exotic properties of $s$-wave topological superconducting states have close relations with the unique non-symmorphic lattice structure which induces the orbital-momentum locking. Our results indicate that the monolayer FeSe could be in the topological nontrivial $s$-wave superconducting states if the relevant effective pairing interactions are dominant in comparison with other candidates.

11 pages, 4 figures

References in corpus (17)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Quantum Spin Hall Effect and Topologically Invariant Chern Numbers
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO${}_3$ (001): a first-principles study
• Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
• Topological Phases in the Single-Layer FeSe
• Effects of charge doping and constrained magnetization on the electronic structure of an FeSe monolayer
• Electromagnetic and thermal responses of Z topological insulators and superconductors in odd spatial dimensions
• First-principles study of magnetic frustration in FeSe epitaxial films on SrTiO${}_3$
• Quantum thermal Hall effect of Majorana fermions on the surface of superconducting topoloigcal insulators

Cited by in corpus (17)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Topological quantum states of matter in iron-based superconductors: From concepts to material realization
• High-temperature superconductivity in one-unit-cell FeSe films
• Observation of topological transition in high-T${}_c$ superconductor FeTe${}_{1-x}$Se${}_x$/SrTiO${}_3$(001) monolayers
• Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit
• Topological Nonsymmorphic Crystalline Superconductors
• Mechanism, time-reversal symmetry and topology of superconductivity in noncentrosymmetric systems
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Edge states at nematic domain walls in FeSe films
• Topological Crystalline Superconductivity in Dirac Semimetal Phase of Iron-based Superconductors
• Exciton condensation in strongly correlated quantum spin Hall insulators
• Twisted-bilayer FeSe and the Fe-based superlattices
• Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
• Topological crystalline antiferromagnetic state in tetragonal FeS
• Stable Monolayer alpha-Phase of CdTe: Strain-Dependent Properties
• Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation
• Non-Abelian Evolution of a Majorana Train in a Single Josephson Junction