Observation of Multiple Topological Corner States in Thermal Diffusion

Abstract

Higher-dimensional topological meta-materials have more flexible than one-dimensional topological materials, which are more convenient to apply and solve practical problems. However, in diffusion systems, higher-dimensional topological states have not been well studied. In this work, we experimentally realized the 2D topological structure based on a kagome lattice of thermal metamaterial. Due to the anti-Hermitian properties of the diffusion Hamiltonian, it has purely imaginary eigenvalues corresponding to the decay rate. By theoretical analysis and directly observing the decay rate of temperature through experiments, we present the various corner states in 2D topological diffusive system. Our work constitutes the first realization of multiple corner states with high decay rates in a pure diffusion system, which provides a new idea for the design of topological protected thermal metamaterial in the future.

References in corpus (12)

• Topological Photonics
• Observation of phononic helical edge states in a mechanical 'topological insulator'
• Visualization of higher-order topological insulating phases in two-dimensional dielectric photonic crystals
• Direct observation of corner states in second-order topological photonic crystal slabs
• Bulk Topological Invariants in Noninteracting Point Group Symmetric Insulators
• Photonic crystal nanocavity based on a topological corner state
• Low-threshold topological nanolasers based on second-order corner state
• Quantum states and intertwining phases in kagome materials
• Bulk-boundary correspondence from the inter-cellular Zak phase
• Higher-Order Topological In-Bulk Corner State in Pure Diffusion Systems
• Superconducting, topological and transport properties of kagome metals CsTi${}_3$Bi${}_5$ and RbTi${}_3$Bi${}_5$
• Higher-order topological heat conduction on a lattice for detection of corner states