Magnon-mediated superconductivity on the surface of a topological insulator

Abstract

We study superconductivity on the surface of a topological insulator, mediated by magnetic fluctuations in an adjacent ferromagnetic or antiferromagnetic insulator. Superconductivity can arise from effective interactions between helical fermions induced by interfacial fermion-magnon interactions. For both ferromagnetic and antiferromagnetic insulators, these fermion-fermion interactions have the correct structure to facilitate pairing between particles located on the same side of the Fermi surface, also known as Amperean pairing. In antiferromagnets, the strength of the induced interactions can be enhanced by coupling the topological insulator asymmetrically to the two sublattices of the antiferromagnet. This effect is further amplified by next nearest neighbor frustration in the antiferromagnetic insulator. The enhancement makes the induced interactions significantly stronger in the antiferromagnetic case, as compared to the ferromagnetic case. These results indicate that an uncompensated antiferromagnetic interface might be a better candidate than a ferromagnetic interface for proximity-induced magnon-mediated superconductivity on the surface of a topological insulator.

12 pages, 9 figures

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• Dirac materials
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Cited by in corpus (23)

• A comprehensive review on topological superconducting materials and interfaces
• Topological Superconductivity Mediated by Skyrmionic Magnons
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• Amperean superconductivity cannot be induced by deep subwavelength cavities in a two-dimensional material
• Possible odd-frequency Amperean magnon-mediated superconductivity in topological insulator -- ferromagnetic insulator bilayer
• Collective excitations of a Bose-Einstein condensate of hard-core bosons and their mediated interactions: from two-body bound states to mediated superfluidity
• Phonon-mediated spin-polarized superconductivity in altermagnets
• Topological superconductivity mediated by magnons of helical magnetic states
• Interface probe for antiferromagnets using geometric curvature
• Stability of superconducting gap symmetries arising from antiferromagnetic magnons
• Magnon drag in a metal-insulating antiferromagnet bilayer
• Topological superconductivity induced by a Kitaev spin liquid
• Topological Interlayer Superconductivity in a van der Waals Heterostructure
• Renormalization of antiferromagnetic magnons by superconducting condensate and quasiparticles
• Strong-coupling approach to temperature dependence of competing orders of superconductivity: Possible time-reversal symmetry breaking and nontrivial topology
• Magnon-mediated superconductivity on ferromagnetic wallpaper fermions
• Exchange tensors, generalized RKKY interactions, and magnetization dynamics in heterostructures of ferromagnets and topological insulators
• Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states
• Fate of surface gaps in magnetic topological insulators
• Dominant superconducting correlations in a Luttinger liquid induced by spin fluctuations
• Realizing attractive interacting topological surface fermions: A resonating TI- thin film hybrid platform