Electron-magnon coupling and quasiparticle lifetimes on the surface of a topological insulator

Abstract

The fermionic self-energy on the surface of a topological insulator proximity coupled to ferro- and antiferromagnetic insulators is studied. An enhanced electron-magnon coupling is achieved by allowing the electrons on the surface of the topological insulator to have a different exchange coupling to the two sublattices of the antiferromagnet. Such a system is therefore seen as superior to a ferromagnetic interface for the realization of magnon-mediated superconductivity. The increased electron-magnon-coupling simultaneously increases the self-energy effects. In this paper we show how the inverse quasiparticle lifetime and energy renormalization on the surface of the topological insulator can be kept low close to the Fermi level by using a magnetic insulator with a sufficient easy-axis anisotropy. We find that the antiferromagnetic case is most interesting from both a theoretical and an experimental standpoint due to the increased electron-magnon coupling, combined with a reduced need for easy-axis anisotropy compared to the ferromagnetic case. We also consider a set of material and instrumental parameters where these self-energies should be measurable in angle-resolved photoemission spectroscopy experiments, paving the way for a measurement of the interfacial exchange coupling strength.

arXiv comment14 pages, 9 figures, accepted in Physical Review B

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Cited by in corpus (15)

• Topological Superconductivity Mediated by Skyrmionic Magnons
• Many-body effects on superconductivity mediated by double-magnon processes in altermagnets
• Stability of superconducting gap symmetries arising from antiferromagnetic magnons
• Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
• Magnon-mediated topological superconductivity in a quantum wire
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Strong-coupling approach to temperature dependence of competing orders of superconductivity: Possible time-reversal symmetry breaking and nontrivial topology
• Spin-dependent quasiparticle lifetimes in altermagnets
• Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets
• Electric polarization induced by magnons and magnon Nernst effects
• Magnon-mediated superconductivity on ferromagnetic wallpaper fermions
• Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet
• Fate of surface gaps in magnetic topological insulators
• Topological phases of electrons induced by electron-magnon interactions
• Exchange tensors, generalized RKKY interactions, and magnetization dynamics in heterostructures of ferromagnets and topological insulators