Chiral surface and edge plasmons in ferromagnetic conductors

Abstract

The recently introduced concept of "surface Berry plasmons" is studied in the concrete instance of a ferromagnetic conductor in which the Berry curvature, generated by spin-orbit (SO) interaction, has opposite signs for carriers parallel or antiparallel to the magnetization. By using collisionless hy- drodynamic equations with appropriate boundary conditions, we study both the surface plasmons of a three-dimensional ferromagnetic conductor and the edge plasmons of a two-dimensional one. The anomalous velocity and the broken inversion symmetry at the surface or the edge of the conductor create a "handedness", whereby the plasmon frequency depends not only on the angle between the wave vector and the magnetization, but also on the direction of propagation along a given line. In particular, we find that the frequency of the edge plasmon depends on the direction of propagation along the edge. These Berry curvature effects are compared and contrasted with similar effects induced in the plasmon dispersion by an external magnetic field in the absence of Berry curvature. We argue that Berry curvature effects may be used to control the direction of propagation of the surface plasmons via coupling with the magnetization of ferromagnetic conductors, and thus create a link between plasmonics and spintronics.

12 pages, 5 figures; corrected affiliation information

References in corpus (5)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Magnetic effects at the interface between nonmagnetic oxides
• Theory of surface plasmons and surface-plasmon polaritons
• Topological magnetoplasmon
• Nonlocal Anomalous Hall Effect

Cited by in corpus (9)

• Chiral plasmons with twisted atomic bilayers
• Hall and dissipative viscosity effects on edge magnetoplasmons
• Perturbation theory for two-dimensional hydrodynamic plasmons
• Asymmetry-driven plasmon instabilities in confined hydrodynamic electron flows
• Plasmonic modes at inclined edges of anisotropic 2D materials
• Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
• Nonreciprocal Weyl semimetal waveguide
• Chiral edge plasmons in quantum anomalous Hall insulators
• Anomalous skew scattering of plasmons in a Dirac electron fluid