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)。