期刊
ADVANCED MATERIALS
卷 34, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202202257
关键词
thermal diffusion; thermal functional materials; topological insulators
类别
资金
- Singapore Ministry of Education [MOE2018-T2-2-189, MOE2019-T2-2-085, MOE2016-T3-1-006]
- A*STAR AME IRG Grant [A20E5c0095]
- National Research Foundation Singapore Competitive Research Program [NRF-CRP18-2017-02, NRF-CRP22-2019-0006, NRF-CRP23-2019-0007]
- Research Grants Council of Hong Kong [AoE/P-701/20]
- National Natural Science Foundation of China (NNSFC) [62175215]
- A*STAR AME Programmatic Funds [A18A7b0058]
This study extends the concept of band topology from wave systems to diffusion dynamics and experimentally observes the emergence of stable topological edge decays within the gap of bulk decays.
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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