2021/03/31 by Jan Košata, Oded Zilberberg
Materials Science · Physics and Astronomy · #Dirac (video compression format) #Metamaterial #Metamaterials and Metasurfaces Applications #Mode (computer interface) #Quantum Mechanics and Non-Hermitian Physics #Realization (probability) #Scheme (mathematics) #Simple (philosophy) #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.other #physics.optics
paper · pdf · doi:10.1103/physrevresearch.3.l032029
published as Phys. Rev. Research 3, 032029 (2021)
openalex publication_date 2021/07/30 · arxiv created 2021/07/31 · arxiv updated 2021/08/04 · openalex created_date 2021/08/16 · openalex updated_date 2026/08/06
We present a symmetry-based scheme to create zero-dimensional (0D) second-order topological modes in continuous two-dimensional (2D) systems. We show that a metamaterial with a p6m-symmetric pattern exhibits two Dirac cones, which can be gapped in two distinct ways by deforming the pattern. Combining the deformations in a single system then emulates the 2D Jackiw-Rossi model of a topological vortex, where 0D in-gap bound modes are guaranteed to exist. We exemplify our approach with the simple hexagonal, kagome, and honeycomb lattices. We furthermore formulate a quantitative method to extract the topological properties from finite-element simulations, which facilitates further optimization of the bound mode characteristics. Our scheme enables the realization of second-order topology in a wide range of experimental systems.