Phonon-mediated strong coupling between a three-dimensional topological insulator and a two-dimensional antiferromagnetic material

Abstract

Van der Waals antiferromagnetic and topological insulator materials provide powerful platforms for modern optical, electronic, and spintronic devices applications. The interaction between an antiferromagnet (AFM) and a topological insulator (TI), if sufficiently strong, could offer emergent hybrid material properties that enable new functionality exceeding what is possible in any individual material constituent. In this work, we study strong coupling between THz excitations in a three dimensional (3D) topological insulator and a quasi-two dimensional (2D) antiferromagnetic material resulting in a new hybridized mode, namely a surface Dirac plasmon-phonon-magnon polariton. We find that the interaction between a surface Dirac plasmon polariton in the 3D TI and a magnon polariton in the 2D AFM is mediated by the phonon coupling in the 3D TI material. The coupling of phonons with an electromagnetic wave propagating in the 3D TI enhances the permittivity of the TI thin film in a way that results in a strong correlation between the dispersion of Dirac plasmon polaritons on the surfaces of the TI with the thickness of the TI. As a result, the dispersion of surface Dirac plasmon polaritons in the TI can be tuned toward resonance with the magnon polariton in the AFM material by varying the TI's thickness, thereby enhancing the strength of the coupling between the excitations in the two materials. The strength of this coupling, which results in the surface Dirac plasmon-phonon-magnon polariton, can be parameterized by the amplitude of the avoided-crossing splitting between the two polariton branches at the magnon resonance frequency...

References in corpus (18)

• Magnetic 2D materials and heterostructures
• Strong coupling between surface plasmon polaritons and emitters
• Theory of surface plasmons and surface-plasmon polaritons
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Perspective: Ultrafast magnetism and THz spintronics
• Tunable light-matter interaction and the role of hyperbolicity in graphene-hBN system
• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Giant magnetic anisotropy of the bulk antiferromagnets IrMn and IrMn3
• Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
• Magnetic anisotropy and exchange interactions of two-dimensional FePS${}_3$, NiPS${}_3$ and MnPS${}_3$ from first principles calculations
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Principles of spintronic THz emitters
• Plasmonics in topological insulators: Spin-charge separation, the influence of the inversion layer, and phonon-plasmon coupling
• Surface plasmon polaritons in topological insulator
• First Principles Study of the Giant Magnetic Anisotropy Energy in Bulk Na4IrO4
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Strong coupling between a topological insulator and a III-V heterostructure at terahertz frequency
• Surface plasmon-phonon-magnon polariton in a topological insulator-antiferromagnetic bilayer structure

Cited by in corpus (4)

• Giant spin Nernst effect in a two-dimensional antiferromagnet due to magnetoelastic coupling-induced gaps and interband transitions between magnon-like bands
• Hybridized magnonic materials for THz frequency applications
• Manipulating Spin-Lattice Coupling in Layered Magnetic Topological Insulator Heterostructure $via$ Interface Engineering
• Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets