经典电路网络中奇异束缚态的实验观察  

Experimental observation of exceptional bound states in a classical circuit network

作　　者：邹德源 陈天 孟海瑜 Yee Sin Ang 张向东 李庆华 Deyuan Zou;Tian Chen;Haiyu Meng;Yee Sin Ang;Xiangdong Zhang;Ching Hua Lee(Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education,Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,Beijing 100081,China;School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China;Department of Physics,National University of Singapore,Singapore 117542,Singapore;Science,Mathematics and Technology Cluster,Singapore University of Technology and Design,Singapore 487372,Singapore;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China)

机构地区：[1]Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education,Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,Beijing 100081,China [2]School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China [3]Department of Physics,National University of Singapore,Singapore 117542,Singapore [4]Science,Mathematics and Technology Cluster,Singapore University of Technology and Design,Singapore 487372,Singapore [5]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

出　　处：《Science Bulletin》2024年第14期2194-2204,共11页科学通报（英文版）

基　　金：supported by the National Key R&D Program of China(2022YFA1404904);the National Research Foundation Singapore grant under its QEP2.0 programme(NRF2021-QEP2-02-P09);the Ministry of Education(MOE)Tier-II grant(MOE-T2EP502220008);supported by the SUTD-ZJU Thematic Research Grant(SUTD-ZJU(TR)202203)。

摘　　要：Exceptional bound(EB)states represent a unique new class of robust bound states protected by the defectiveness of non-Hermitian exceptional points.Conceptually distinct from the more well-known topological states and non-Hermitian skin states,they were recently discovered as a novel source of negative entanglement entropy in the quantum entanglement context.Yet,EB states have been physically elusive,being originally interpreted as negative probability eigenstates of the propagator of nonHermitian Fermi gases.In this work,we show that EB states are in fact far more ubiquitous,also arising robustly in broad classes of systems whether classical or quantum.This hinges crucially on a newlydiscovered spectral flow that rigorously justifies the EB nature of small candidate lattice systems.As a highlight,we present their first experimental realization through an electrical circuit,where they manifest as prominent stable resonant voltage profiles.Our work brings a hitherto elusive but fundamentally distinctive quantum phenomenon into the realm of classical metamaterials,and provides a novel pathway for the engineering of robust modes in otherwise sensitive systems..

关 键 词：Exceptional bound states Classical circuit network NON-HERMITIAN ROBUSTNESS Exceptional point 

分 类 号：O469[理学—凝聚态物理]