摘要
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 nonHermitian 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 sensitive thermal sensing and others.
作者
刘云开
曹培超
祁铭鸿
黄强开来
高峰
彭玉桂
李鹰
祝雪丰
Yun-Kai Liu;Pei-Chao Cao;Minghong Qi;Qiang-Kai-Lai Huang;Feng Gao;Yu-Gui Peng;Ying Li;Xue-Feng Zhu(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 University,Shaoxing 312000,China)
基金
supported by the National Key Research and Development Program of China (2023YFB4604100, and 2023YFB4604800)
the National Natural Science Foundation of China (92163123, 12304492, and 52250191)
Zhejiang Provincial Natural Science Foundation of China (LZ24A050002)
the China Postdoctoral Science Foundation (2023M733120)。
作者简介
Yun-Kai Liu is pursuing a Ph.D.degree from Huazhong University of Science and Technology under the supervision of Prof.Xue-Feng Zhu.His current research focuses on thermal functional metamaterials and nonHermitian effects.These authors contributed equally to this work;Pei-Chao Cao is currently a posdoctoral researcher at Zhejiang University and he received the Ph.D.degree from Huazhong University of Science and Technology in 2022.His recent research focuses on thermal metamaterials and non-Hermitian physics.These authors contributed equally to this work;Corresponding authors:Yu-Gui Peng received his B.S.and Ph.D.degrees in Physics from Huazhong University of Science and Technology in 2014 and 2019,respectively.He is currently an associate professor at Huazhong University of Science and Technology.His research interest includes acoustic/thermal functional and topological metamaterials.E-mail addresses:ygpeng@hust.edu.cn;Corresponding authors:Ying Li obtained his Ph.D.degree from Fudan University on 2016.Then he worked as a research fellow at National University of Singapore.He joined Zhejiang University in 2020 as a tenure-track researcher.His research interest is mainly about heat transfer in artificial structures(thermal metamaterials and metadevices),especially those exhibiting non-reciprocal effects,non-Hermitian effects,and multi-physical effects.E-mail addresses:eleying@zju.edu.cn;Corresponding authors:Xue-Feng Zhu received his B.S.degree in Biomedical Engineering from Huazhong University of Science and Technology in 2005 and the Ph.D.degree in acoustics from Nanjing University in 2011.He is currently a professor at Huazhong University of Science and Technology.His research interest includes acoustic/thermal functional metamaterials,and ultrasonic imaging technology.E-mail addresses:xfzhu@hust.edu.cn。
