Spin-governed topological surfaces and broken spin-momentum locking in a gyromagnetic medium
arXiv:2102.02027 · doi:10.1103/PhysRevA.105.023528
Abstract
Topology of isofrequency surfaces plays a crucial role in characterizing the interaction of an electromagnetic wave with a medium. Thus, engineering the topology in complex media is leading to novel applications, ranging from super-resolution microscopy with hyperbolic metamaterials to sub-wavelength waveguiding structures. Here, we investigate the spin-governed nature of isofrequency surfaces in a general gyromagnetic medium. We show that gyrotropy also plays an important role in the topological properties of a medium, along with the anisotropic permeability and permittivity. Even though the topology primarily depends on permeability, gyrotropy can suppress or support the existence of certain topological surfaces. We reveal the connection between the gyrotropy imposed constraints and the photonic spin-profile of the topological surfaces. The spin-profile along the isofrequency surface is locked to the material, resulting in the non-reciprocity and breaking of the spin-momentum locking in the gyromagnetic medium. Further, we show that the conflict between spin-momentum locking and material locked spin leads to asymmetric mode profile and gyrotropy-induced cutoff in guided wave structures. Our work provides important insights into the underlying link between topology, spin, and non-reciprocity in gyrotropic media.
arXiv comment13 pages, 13 figures
References in corpus (24)
- Optical Hyperlens: Far-field imaging beyond the diffraction limit
- Magnon-photon-phonon entanglement in cavity magnomechanics
- Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial
- Hyperbolic metamaterials: fundamentals and applications
- Does a Surface Polariton Have Spin?
- Level Attraction Due to Dissipative Magnon-Photon Coupling
- Universal spin-momentum locking of evanescent waves
- Measuring the Transverse Spin Density of Light
- Transverse spin and momentum in two-wave interference
- Exciton Polaritons in a Two-Dimensional Lieb Lattice with Spin-Orbit Coupling
- Propagation of spin-waves packets in individual nano-sized yttrium iron garnet magnonic conduits
- Universal Spin-Momentum Locked Optical Forces
- Macroscopic direct observation of optical spin-dependent lateral forces and left-handed torques
- The magnetic and electric transverse spin density of spatially confined light
- Spin-Momentum Locking in the Near Field of Metal Nanoparticles
- Lossless and loss-induced topological transitions of isofrequency surfaces of a composite magnetic-semiconductor medium
- Spin-momentum locked interaction between guided photons and surface electrons in topological insulators
- Ultrafast Topological Engineering in Metamaterials
- Bi-hyperbolic isofrequency surface in a magnetic-semiconductor superlattice
- Photonic Chern insulators made of gyromagnetic hyperbolic metamaterials
- Polaritons dispersion in a composite ferrite-semiconductor structure near gyrotropic-nihility state
- Enhanced superlens imaging with loss-compensating hyperbolic near-field spatial filter
- Tetra-hyperbolic and tri-hyperbolic optical phases in anisotropic metamaterials without magnetoelectric coupling due to hybridization of plasmonic and magnetic Bloch high-k polaritons
- Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media