Observation of an acoustic topological Euler insulator with meronic waves

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外文摘要：Topological band theory has conventionally been concerned with the topology of bands around a single gap.Only recently non-Abelian topologies that thrive on involving multiple gaps were studied,unveiling a new horizon in topological physics beyond the conventional paradigm.Here,we report on the first experimental realization of a topological Euler insulator phase with unique meronic characterization in an acoustic metamaterial.We demonstrate that this topological phase has several nontrivial features:First,the system cannot be described by conventional topological band theory,but has a nontrivial Euler class that captures the unconventional geometry of the Bloch bands in the Brillouin zone.Second,we uncover in theory and probe in experiments a meronic configuration of the bulk Bloch states for the first time.Third,using a detailed symmetry analysis,we show that the topological Euler insulator evolves from a non-Abelian topological semimetal phase via.the annihilation of Dirac points in pairs in one of the band gaps.With these nontrivial properties,we establish concretely an unconventional bulk-edge correspondence which is confirmed by directly measuring the edge states via.pump-probe techniques.Our work thus unveils a nontrivial topological Euler insulator phase with a unique meronic pattern and paves the way as a platform for non-Abelian topological phenomena.

外文关键词：

Euler insulatorsMeronic wavesAcoustic metamaterialsTopological phases of matter

作者：

Bin Jiang、Adrien Bouhon、Shi-Qiao Wu、Ze-Lin Kong、Zhi-Kang Lin、Robert-Jan Slager、Jian-Hua Jiang

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作者单位：

Suzhou Institute for Advanced Research,University of Science and Technology of China,Suzhou 215123,China

School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215006,China

TCM Group,Cavendish Laboratory,University of Cambridge,Cambridge CB3 0HE,UK

NORDITA,Stockholm University and KTH Royal Institute of Technology,Stockholm SE-106 91,Sweden

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基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinathe"Hundred Talents Program"of the Chinese Academy of SciencesPriority Academic Program Development(PAPD)of Jiangsu Higher Education InstitutionsMarie-Curie fellowshipSwedish Research Council(Vetenskapsradet)New Investigator Award,EPSRCEPSRC ERC underwriteRoyal Society exchangeTrinity College,Cambridge

项目编号：

2022YFA140440012125504120742811010253152021-04681EP/W00187X/1EP/X025829/1IES/R1/221060

出版年：

2024

DOI：

10.1016/j.scib.2024.04.009

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(11)