Explanipedia

Dimensional Hierarchy of Topological Bound States in the Continuum Open

Shunda Yin, Zhenyu Wang, Liping Ye, Hailong He, Manzhu Ke , et al. · 2025

Bound states in the continuum (BICs), with the ability of trapping and manipulating waves within the radiation continuum, have gained significant attention for their potential applications in optics and acoustics. However, challenges arise…

Acoustic Metasurface for Space‐time Reflection Manipulation Open

Yunhan Yang, Han Jia, Jiuyang Lu, Yuzhen Yang, Tuo Liu , et al. · 2025

Recently, space‐time modulation has revolutionized the wave engineering technologies, providing unprecedented opportunities beyond traditional static systems. This advancement is crucial across diverse fields, ranging from non‐reciprocal t…

Experimental probe of point gap topology from non-Hermitian Fermi-arcs Open

Riyi Zheng, Lin Jing, Jialuo Liang, Kun Ding, Jiuyang Lu , et al. · 2024

The gap in spectra of a physical system is fundamental in physics, while gap topology further restricts possible occurrent gaps of topological boundary states. The emergence of non-Hermiticity unveils a unique gap type known as the point g…

Observation of exceptional line semimetal in three-dimensional non-Hermitian phononic crystals Open

Yejian Hu, Jien Wu, Peidong Ye, Weiyin Deng, Jiuyang Lu , et al. · 2024

Non-Hermitian topological phases, which exhibit unique features such as skin effect and exceptional points originated from nontrivial band topologies in complex plane, have attracted enormous attention in condensed-matter physics and metam…

Higher-order topological transport protected by boundary Chern number in phononic crystals Open

Zhenyu Wang, Liping Ye, Zhenhang Pu, Qiyun Ma, Hailong He , et al. · 2024

Topological pumps enable robust transports of topological states when the system parameters are varied in a cyclic process. The reported topological pumps are protected by the bulk topology. However, the exploration of topological pump pro…

Valley edge states as bound states in the continuum Open

Shunda Yin, Liping Ye, Hailong He, Xueqin Huang, Manzhu Ke , et al. · 2024

Bound states in the continuum (BICs) are spatially localized states with energy embedded in the continuum spectrum of extended states. The combination of BICs physics and nontrivial band topology theory giving rise to topological BICs, whi…

Observation of Higher Order Nodal Line Semimetal in Phononic Crystals Open

Qiyun Ma, Zhenhang Pu, Liping Ye, Jiuyang Lu, Xueqin Huang , et al. · 2024

Higher-order topological insulators and semimetals, which generalize the conventional bulk-boundary correspondence, have attracted extensive research interest. Among them, higher-order Weyl semimetals feature two-fold linear crossing point…

One-dimensional synthetic waterborne phononic crystals Open

Chenyang Hu, Jialuo Liang, Riyi Zheng, Jiuyang Lu, Weiyin Deng , et al. · 2024

Underwater acoustics has wide applications in underwater communication, underwater positioning, underwater navigation, and so on. Inspired by the concept of topological physics, the study of topological states in waterborne phononic crysta…

Spin-dependent localization of helical edge states in a non-Hermitian phononic crystal Open

Junpeng Wu, Riyi Zheng, Jialuo Liang, Manzhu Ke, Jiuyang Lu , et al. · 2023

As a distinctive feature unique to non-Hermitian systems, non-Hermitian skin effect displays fruitful exotic phenomena in one or higher dimensions, especially when conventional topological phases are involved. Among them, hybrid skin-topol…

Real-projective-plane hybrid-order topological insulator realized in phononic crystals Open

Pengtao Lai, Jien Wu, Zhenhang Pu, Qiuyan Zhou, Jiuyang Lu , et al. · 2023

The manifold of the fundamental domain of the Brillouin zone is always considered to be a torus. However, under the synthetic gauge field, the Brillouin manifold can be modified by the projective symmetries, resulting in unprecedented topo…

Observation of geometry-dependent skin effect in non-Hermitian phononic crystals with exceptional points Open

Qiuyan Zhou, Jien Wu, Zhenhang Pu, Jiuyang Lu, Xueqin Huang , et al. · 2023

Exceptional points and skin effect, as the two distinct hallmark features unique to the non-Hermitian physics, have each attracted enormous interests. Recent theoretical works reveal that the topologically nontrivial exceptional points can…

Acoustic bound states in continuum protected by crystalline symmetry Open

Jincheng Pan, Jiuyang Lu, Weiyin Deng, Xueqin Huang, Zhengyou Liu · 2023

Bound states in continuum (BICs) are highly localized resonant states embedded in the continuum background. Recently, crystalline symmetries have been exploited as a new mechanism in generating BICs. Here we propose crystalline-symmetry–pr…

Variable-order topological insulators Open

Yating Yang, Handa Sun, Jiuyang Lu, Xueqin Huang, Weiyin Deng , et al. · 2023

Topological insulators, either the first-order or the higher-order, experience generally a transition to a trivial phase or a topological one of the same order through the gap closing and reopening procedure. Here, we report a topological …

Brillouin Klein space and half-turn space in three-dimensional acoustic crystals Open

Zhenxiao Zhu, Linyun Yang, Jien Wu, Yan Meng, Xiang Xi , et al. · 2023

The Bloch band theory and Brillouin zone (BZ) that characterize wave behaviors in periodic mediums are two cornerstones of contemporary physics ranging from condensed matter to topological physics. Recent theoretical breakthrough revealed …

Topological phononic metamaterials Open

Weiwei Zhu, Weiyin Deng, Yang Liu, Jiuyang Lu, Zhi‐Kang Lin , et al. · 2023

The concept of topological energy bands and their manifestations have been demonstrated in condensed matter systems as a fantastic paradigm toward unprecedented physical phenomena and properties that are robust against disorders. Recent ye…

Observation of exceptional points and skin effect correspondence in non-Hermitian phononic crystals Open

Qiuyan Zhou, Jien Wu, Zhenhang Pu, Jiuyang Lu, Xueqin Huang , et al. · 2023

Exceptional points and skin effect, as the two distinct hallmark features unique to the non-Hermitian physics, have each attracted enormous interests. Recent theoretical works reveal that the topologically nontrivial exceptional points can…

Variable-order topological insulators Open

Yating Yang, Handa Sun, Jiuyang Lu, Xueqin Huang, Weiyin Deng , et al. · 2023

Topological insulators, either the first-order or the higher-order, experience generally a transition to a trivial phase or a topological one of the same order through the gap closing and reopening procedure. Here amazingly, we report a to…

Topological materials for full-vector elastic waves Open

Ying Wu, Jiuyang Lu, Xueqin Huang, Yating Yang, Li Luo , et al. · 2022

Elastic wave manipulation is important in a wide variety of applications, including information processing in small elastic devices and noise control in large solid structures. The recent emergence of topological materials has opened new a…

Observation of quadruple Weyl point in hybrid-Weyl phononic crystals Open

Li Luo, Weiyin Deng, Yating Yang, Yan Mou, Jiuyang Lu , et al. · 2022

The discovery of Weyl semimetals opens the door for searching topological semimetals in physical science. The Weyl points are generally recognized as conventional, quadratic, spin-1, and those of high topological charges. Here we report th…

Acoustic higher-order topology derived from first-order with built-in Zeeman-like fields Open

Xueqin Huang, Jiuyang Lu, Zhongbo Yan, Mou Yan, Weiyin Deng , et al. · 2021

Azimuthally and radially polarized orbital angular momentum modes in valley topological photonic crystal fiber Open

Zhishen Zhang, Jiuyang Lu, Tao Liu, Jiulin Gan, Xiaobo Heng , et al. · 2021

Artificially tailoring the polarization and phase of light offers new applications in optical communication, optical tweezers, and laser processing. Valley topological physics provides a novel paradigm for controlling electromagnetic waves…

Spin-Chern insulator induced by pseudospin-orbit coupling in phononic crystals Open

Weiyin Deng, Xueqin Huang, Jiuyang Lu, Zhengyou Liu · 2021

The boundary modes of classical waves protected by the topology are of great significance for robust energy transmission and reliable information processing. Many endeavors have been made to realize topological insulators in electromagneti…

Hybrid-Order Topological Insulators in a Phononic Crystal Open

Yating Yang, Jiuyang Lu, Mou Yan, Xueqin Huang, Weiyin Deng , et al. · 2021

Topological phases, including the conventional first-order and higher-order topological insulators and semimetals, have emerged as a thriving topic in the fields of condensed-matter physics and materials science. Usually, a topological ins…

Source dataset of Figs.3 and S10 of "Higher-order topological semimetal in acoustic crystals" Open

Qiang Wei, Xuewei Zhang, Weiyin Deng, Jiuyang Lu, Xueqin Huang , et al. · 2021

Fig_3.xlsx is the source data from the third figure in the main text and Fig_S10.xlsx is the source data from the tenth figure in Supplementary Information of our submitted manuscript in Nature Materials …

Source dataset of Figs.3 and S10 of "Higher-order topological semimetal in acoustic crystals" Open

Qiang Wei, Xuewei Zhang, Weiyin Deng, Jiuyang Lu, Xueqin Huang , et al. · 2021

Fig_3.xlsx is the source data from the third figure in the main text and Fig_S10.xlsx is the source data from the tenth figure in Supplementary Information of our submitted manuscript in Nature Materials (…

Type-II Dirac points and edge transports in phononic crystal plates Open

Quan-Bin Luo, Xueqin Huang, Weiyin Deng, Ying Wu, Jiuyang Lu , et al. · 2021

The accidentally degenerate type-II Dirac points in sonic crystal has been realized recently. However, elastic phononic crystals with type-II Dirac points have not yet been explored. In this work, we design a two-dimensional phononic cryst…

Acoustic square-root topological states Open

Mou Yan, Xueqin Huang, Li Luo, Jiuyang Lu, Weiyin Deng , et al. · 2020

Square-root topological states are new topological phases, whose topological\nproperty is inherited from the square of the Hamiltonian. We realize the\nfirst-order and second-order square-root topological insulators in phononic\ncrystals, …

Acoustic corner states in topological insulators with built-in Zeeman-like fields Open

Xueqin Huang, Jiuyang Lu, Zhongbo Yan, Mou Yan, Weiyin Deng , et al. · 2020

The higher-order topological insulators (HOTIs), with such as the topological corner states, emerge as a thriving topic in the field of topological physics. But few connections have been found for the HOTIs with the well explored first-ord…

Broadband photonic topological insulator based on triangular-holes array with higher energy filling efficiency Open

Zhishen Zhang, Feng Li, Jiuyang Lu, Tao Liu, Xiaobo Heng , et al. · 2020

Photonic topological insulators (PTIs) bring markedly new opportunities to photonic devices with low dissipation and directional transmission of signal over a wide wavelength range due to the broadband topological protection. However, the …

Acoustic spin-Chern insulator induced by synthetic spin–orbit coupling with spin conservation breaking Open

Weiyin Deng, Xueqin Huang, Jiuyang Lu, Valerio Peri, Feng Li , et al. · 2020

Topologically protected surface modes of classical waves hold the promise to enable a variety of applications ranging from robust transport of energy to reliable information processing networks. However, both the route of implementing an a…

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