Second-order topological modes in two-dimensional continuous media

Abstract

We present a symmetry-based scheme to create 0D second-order topological modes in continuous 2D systems. We show that a metamaterial with a \textit{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 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.

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• A soft-clamped topological waveguide for phonons
• Efficient Design of Helical Higher-Order Topological Insulators in 3D Elastic Medium
• Dirac cones and higher-order topology in quasi-continuous media
• A semiclassical treatment of spinor topological effects in driven, inhomogeneous insulators under external electromagnetic fields
• Band engineering and study of disorder using topology in compact high kinetic inductance cavity arrays
• Effects of first- and second-order topological phases on equilibrium crystal shapes
• Hinge modes of three-dimensional Euler insulators