首页|Observation of non-Hermitian skin effect in thermal diffusion

Observation of non-Hermitian skin effect in thermal diffusion

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The paradigm shift of Hermitian systems into the non-Hermitian regime profoundly modifies inherent property of the topological systems,leading to various unprecedented effects such as the non-Hermitian skin effect(NHSE).In the past decade,the NHSE has been demonstrated in quantum,optical and acoustic systems.Beside those wave systems,the NHSE in diffusive systems has not yet been observed,despite recent abundant advances in the study of topological thermal diffusion.In this work,we design a thermal diffusion lattice based on a modified Su-Schrieffer-Heeger model and demonstrate the diffusive NHSE.In the proposed model,the asymmetric temperature field coupling inside each unit cell can be judiciously realized by appropriate configurations of structural parameters.We find that the temperature fields trend to concentrate toward the target boundary which is robust against initial excitation conditions.We thus experimentally demonstrated the NHSE in thermal diffusion and verified its robustness against various defects.Our work provides a platform for exploration of non-Hermitian physics in the diffusive systems,which has important applications in efficient heat collection,highly sen-sitive thermal sensing and others.

Non-Hermitian skin effectAsymmetric couplingThermal metamaterialHeat diffusion

Yun-Kai Liu、Pei-Chao Cao、Minghong Qi、Qiang-Kai-Lai Huang、Feng Gao、Yu-Gui Peng、Ying Li、Xue-Feng Zhu

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School of Physics and Innovation Institute,Huazhong University of Science and Technology,Wuhan 430074,China

State Key Laboratory of Extreme Photonics and Instrumentation,ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 310027,China

International Joint Innovation Center,The Electromagnetics Academy at Zhejiang University,Zhejiang University,Haining 314400,China

Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang,Jinhua Institute of Zhejiang University,Zhejiang University,Jinhua 321099,China

Shaoxing Institute of Zhejiang University,Zhejiang U

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国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金浙江省自然科学基金中国博士后科学基金

2023YFB46041002023YFB4604800921631231230449252250191LZ24A0500022023M733120

2024

10.1016/j.scib.2024.02.040

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(9)
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