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Related Experiment Video

Updated: Aug 12, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Higher-Order Topological States in Thermal Diffusion.

Haotian Wu¹, Hao Hu¹, Xixi Wang¹

¹School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Advanced Materials (Deerfield Beach, Fla.)

|February 2, 2023

Summary

Researchers experimentally realized higher-order thermal topological insulators in 2D lattices. This breakthrough enables topological protection for thermal diffusion in corner states, advancing thermal management beyond 1D systems.

Keywords:

amorphous deformation anti-Hermiticity higher-order topological insulators thermal diffusion thermal functional materials

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Last Updated: Aug 12, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Characterization of Thermal Transport in One-dimensional Solid Materials

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Published on: January 26, 2014

Area of Science:

Condensed Matter Physics
Metamaterials Science
Thermal Transport Phenomena

Background:

Conventional topological materials exhibit topological states at their boundaries.
Higher-order topological materials support topological states at boundaries of boundaries (e.g., corners, hinges).
Previous extensions of band topology to thermal diffusion were limited to 1D lattices, precluding higher-order topological phenomena.

Purpose of the Study:

To experimentally realize a higher-order thermal topological insulator.
To investigate topological corner states in a 2D diffusion lattice.
To demonstrate topological protection of thermal diffusion states.

Main Methods:

Fabrication of a generalized 2D diffusion lattice.
Characterization of thermal diffusion properties.
Analysis of the anti-Hermitian diffusion Hamiltonian and its bandgap.

Main Results:

Experimental observation of topological corner states for thermal diffusion within the bulk diffusion rate bandgap.
Demonstration of the anti-Hermitian nature of the diffusion Hamiltonian leading to these states.
Confirmation of topological protection through the stability of corner state diffusion profiles under amorphous deformation.

Conclusions:

This work represents the first experimental realization of higher-order topology in purely diffusive systems.
The findings pave the way for advanced thermal management strategies utilizing topological protection.
The study extends topological concepts to 2D thermal diffusion, enabling novel functionalities beyond 1D geometries.