Experimental observation of exceptional bound states in a classical circuit network

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外文摘要：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 neg-ative 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 non-Hermitian 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 newly-discovered 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 man-ifest 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 path-way for the engineering of robust modes in otherwise sensitive systems.

外文关键词：

Exceptional bound statesClassical circuit networkNon-HermitianRobustnessExceptional point

作者：

Deyuan Zou、Tian Chen、Haiyu Meng、Yee Sin Ang、Xiangdong Zhang、Ching Hua Lee

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作者单位：

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

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基金：

National Key R&D Program of ChinaNational Research Foundation Singapore grant under its QEP2.0 programmeMinistry of Education(MOE)Tier-Ⅱ grantSUTD-ZJU Thematic Research

项目编号：

2022YFA1404904NRF2021-QEP2-02-P09MOE-T2EP50222-0008SUTD-ZJUTR202203

出版年：

2024

DOI：

10.1016/j.scib.2024.05.036

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(14)

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