Acoustic higher-order topological insulator from momentum-space nonsymmorphic symmetries

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Bibliographic Details
Main Authors:	Hu, Jinbing, Zhou, Kai, Song, Tianle, Jiang, Xuntao, Zhuang, Songlin, Yang, Yi
Format:	Preprint
Published:	2024
Subjects:	Atomic Physics Materials Science Quantum Physics
Online Access:	Acceder al recurso
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_version_	1866916391182925824
author	Hu, Jinbing Zhou, Kai Song, Tianle Jiang, Xuntao Zhuang, Songlin Yang, Yi
author_facet	Hu, Jinbing Zhou, Kai Song, Tianle Jiang, Xuntao Zhuang, Songlin Yang, Yi
contents	Momentum-space nonsymmorphic symmetries, stemming from the projective algebra of synthetic gauge fields, can modify the manifold of the Brillouin zone and lead to a variety of topological phenomena. We present an acoustic realization of higher-order topological insulators (HOTIs) protected by a pair of anticommutative momentum-space glide reflections. We confirm the presence of momentum-space glide reflection from the measured momentum half translation of edge bands and their momentum-resolved probability distribution using a cylinder geometry made of acoustic resonator arrays. In particular, we observe both intrinsic and extrinsic HOTI features in such a cylinder: hopping strength variation along the open boundary leads to a bulk gap closure, while that along the closed boundary results in an edge gap closure. In addition, we confirm the presence of quadrupole corner modes with transmission and field distribution measurements. Our observation enriches the study of topological physics of momentum-space nonsymmorphic symmetries.
format	Preprint
id	arxiv_https___arxiv_org_abs_2409_08196
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Acoustic higher-order topological insulator from momentum-space nonsymmorphic symmetries Hu, Jinbing Zhou, Kai Song, Tianle Jiang, Xuntao Zhuang, Songlin Yang, Yi Atomic Physics Materials Science Quantum Physics Momentum-space nonsymmorphic symmetries, stemming from the projective algebra of synthetic gauge fields, can modify the manifold of the Brillouin zone and lead to a variety of topological phenomena. We present an acoustic realization of higher-order topological insulators (HOTIs) protected by a pair of anticommutative momentum-space glide reflections. We confirm the presence of momentum-space glide reflection from the measured momentum half translation of edge bands and their momentum-resolved probability distribution using a cylinder geometry made of acoustic resonator arrays. In particular, we observe both intrinsic and extrinsic HOTI features in such a cylinder: hopping strength variation along the open boundary leads to a bulk gap closure, while that along the closed boundary results in an edge gap closure. In addition, we confirm the presence of quadrupole corner modes with transmission and field distribution measurements. Our observation enriches the study of topological physics of momentum-space nonsymmorphic symmetries.
title	Acoustic higher-order topological insulator from momentum-space nonsymmorphic symmetries
topic	Atomic Physics Materials Science Quantum Physics
url	https://arxiv.org/abs/2409.08196

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