journal article·2022-08Open access

Observation of Topological Edge States in Thermal Diffusion

Hao Hu, Song Han, Yihao Yang, Dongjue Liu, Haoran Xue, Gui‐Geng Liu, Zheyu Cheng, Qi Jie Wang, Shuang Zhang, Baile Zhang, Yu Luo

Advanced Materials· Volume 34· Issue 31

Abstract

Abstract Topological band theory predicts that bulk materials with nontrivial topological phases support topological edge states. This phenomenon is universal for various wave systems and is widely observed for electromagnetic and acoustic waves. Here, the notion of band topology is extended from wave to diffusion dynamics. Unlike wave systems that are usually Hermitian, diffusion systems are anti‐Hermitian with purely imaginary eigenvalues corresponding to decay rates. By direct probe of the temperature diffusion, the Hamiltonian of a thermal lattice is experimentally retrieved, and the emergence of topological edge decays is observed within the gap of bulk decays. The results of this work show that such edge states exhibit robust decay rates, which are topologically protected against disorder. This work constitutes a thermal analogue of topological insulators and paves the way to exploring defect‐immune heat dissipation.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Quantum Mechanics and Non-Hermitian Physics · Quantum, superfluid, helium dynamics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

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

Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU‐Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China

International Joint Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China

Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Centre for Disruptive Photonic Technologies Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Department of Physics University of Hong Kong Hong Kong 999077 China

Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong 999077 China

Funding

National Research Foundation Singapore · National Natural Science Foundation of China · Agency for Science, Technology and Research

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