Explanipedia

Topological quantum cascade laser with Dirac-scaled valley edge modes Open

Yunda Chua, Letian Yu, Jieyuan Cui, Bofeng Zhu, Hanyu Liu , et al. · 2025

Topological lasers, born from the fusion of topological physics and lasing theory, offer an unprecedented mechanism to achieve coherent lasing. By utilizing topologically protected boundary states, they exhibit robustness against defects a…

Chiral valley edge states based on Dirac mass engineering Open

Jianwei Liu, Mingwei Li, Xiao‐Dong Chen, Baile Zhang, Jian‐Wen Dong · 2025

Valleytronics has emerged as a promising platform for energy-efficient and high-speed information processing. However, backscattering-induced valley depolarization remains a fundamental limitation, making valley-polarized waves with backsc…

Observation of returning Thouless pumping Open

Zheyu Cheng, S. J. Yue, Yang Long, Wentao Xie, Zuolong Yu , et al. · 2025

Nanoimprinted topological laser in the visible Open

Qiang Zhang, Rui Duan, Yutian Ao, Lin Wang, Xuehong Zhou , et al. · 2025

Nanoimprint lithography (NIL) is a widely used high-throughput fabrication technique for photonic devices, yet its reliability is often compromised by the inevitable imperfections that arise during the demolding process. Topological photon…

Observation of Embedded Topology in a Trivial Bulk via Projective Crystal Symmetry Open

Hau Tian Teo, Yang Long, Hong-yu Zou, Kaiyin Song, Haoran Xue , et al. · 2025

Bulk-boundary correspondence is the foundational principle of topological physics, first established in the quantum Hall effect, where a D-dimensional topologically nontrivial bulk gives rise to (D-1)-dimensional boundary states. The adven…

Continuum Landau surface states in a non-Hermitian Weyl semimetal Open

Shuxin Lin, Rimi Banerjee, Zheyu Cheng, Kohei Kawabata, Baile Zhang , et al. · 2025

The surface states of topological phases, which owe their existence to bulk topological band invariants, possess many features of deep physical significance. In some instances, they can be linked to a quantum anomaly: the violation of a cl…

Perovskite topological exciton-polariton disclination laser at room temperature Open

Feng Jin, Subhaskar Mandal, Xutong Wang, Baile Zhang, Rui Su · 2025

Switchable non-Hermitian skin effect in Bogoliubov modes Open

Hong K. Lo, You Wang, Rimi Banerjee, Baile Zhang, Y. D. Chong · 2025

Interacting or nonlinear lattices can host emergent particle-like modes, such as Bogoliubov quasiparticles, whose band topology and other properties are potentially highly tunable. Despite originating in the study of superconducting materi…

Chiral Valley Edge States Open

Jianwei Liu, Gui-Geng Liu, Jie Zhang, Hao‐Chang Mo, Ruifeng Li , et al. · 2025

Valleytronics has emerged as a promising paradigm, enabling comprehensive control of the valley degree of freedom (DoF) for energy-efficient and high-speed information processing. However, backscattering-induced valley depolarization remai…

Observation of disorder-induced boundary localization Open

Bingbing Wang, Zheyu Cheng, Hong-yu Zou, Yong Ge, Keqi Zhao , et al. · 2025

Bloch wavefunctions in crystals experience localization within the bulk when disorder is introduced, a phenomenon commonly known as Anderson localization. This effect is considered universal, being applicable to all types of waves, quantum…

Self-induced topological edge states in a lattice with onsite nonlinearity Open

Rujiang Li, Wencai Wang, Xiangyu Kong, C. S. Shang, Yongtao Jia , et al. · 2025

Topological edge states typically arise at the boundaries of topologically nontrivial structures or at interfaces between regions with differing topological invariants. When topological systems are extended into the nonlinear regime, linea…

A gain route to reversed Cherenkov radiation Open

Ruoxi Chen, Zheng Gong, Z.-Y. Wang, Xiangfeng Xi, Bowen Zhang , et al. · 2025

In his landmark paper from 1968, Veselago showed that Cherenkov radiation can be reversed in materials with a negative index of refraction, inspiring substantial research into such materials in what became one of the cornerstone concepts o…

S-shaped oscillation mode lasing in droplet microlasers Open

Xuehong Zhou, Rui Duan, Yutian Ao, Qiang Zhang, Lian Xiao , et al. · 2025

The oscillation trajectories of lasing modes can describe both static and dynamic properties of a microlaser, helping determine high-quality (Q) lasing modes and modulate their optical behaviors. Almost all lasing modes for droplet microla…

Acoustic Pseudospin Transport in Dual‐Layer Topological Insulators with Multiple Topological Phases Open

Yin Wang, Ding Jia, Yu‐Jing Lu, Shuai Gu, Yong Ge , et al. · 2025

Pseudospin‐dependent acoustic topological insulators (ATIs) with high‐robustness edge states have recently attracted as surge of interest owing to their potential applications, such as one‐way sound transport and acoustic communications. D…

Observation of non-Hermitian topological disclination states and charge fractionalization Open

Ruifeng Li, Rimi Banerjee, Subhaskar Mandal, Da Li, Long Yang , et al. · 2025

There has been significant interest in exploring topological disclination states, which effectively probe the band topology of the host material beyond the conventional bulk-edge correspondence. While most studies in this area have primari…

Continuous‐Wave Pumped Self‐Assembled Colloidal Topological Lasers Open

Rui Duan, Qiang Zhang, Yi Tian Thung, Xuehong Zhou, Tingting Yin , et al. · 2025

The field of optoelectronic integrated circuits is actively developing reliable and efficient room‐temperature continuous‐wave (CW) lasers. CW‐pumped lasers combine the economical and simple manufacturing processes of colloidal semiconduct…

Free-electron resonance transition radiation via Brewster randomness Open

Zheng Gong, Ruoxi Chen, Zhenchang Wang, Xiangfeng Xi, Yi Yang , et al. · 2025

Free-electron radiation, such as Cherenkov radiation and transition radiation, can generate light at arbitrary frequencies and is fundamental to diverse applications, ranging from electron microscopy, spectroscopy, lasers, to particle dete…

Unsupervised Classification of Non-Hermitian Topological Phases under Symmetries Open

Yang Long, Haoran Xue, Baile Zhang · 2024

The integration of artificial intelligence (AI) into fundamental science has opened new possibilities to address long-standing scientific challenges rooted in mathematical limitations. For example, topological invariants are used to charac…

Observation of perovskite topological valley exciton-polaritons at room temperature Open

Feng Jin, Subhaskar Mandal, Jinqi Wu, Zhenhan Zhang, Wen Wen , et al. · 2024

Topological exciton-polaritons are a burgeoning class of topological photonic systems distinguished by their hybrid nature as part-light, part-matter quasiparticles. Their further control over novel valley degree of freedom (DOF) has offer…

Flatbands from Bound States in the Continuum for Orbital Angular Momentum Localization Open

Baile Zhang, Weiwei Zhu, Hong-yu Zou, Yong Ge, Yin Wang , et al. · 2024

A flatband material is a system characterized by energy bands with zero dispersion, allowing for the compact localization of wavefunctions in real space. This compact localization significantly enhances inter-particle correlations and ligh…

Momentum flatband and superluminal propagation in a photonic time Moiré superlattice Open

Linyang Zou, Hao Hu, Hao Wu, Long Yang, Y. D. Chong , et al. · 2024

Flat bands typically describe energy bands whose energy dispersion is entirely or almost entirely degenerate. One effective method to form flat bands is by constructing Moiré superlattices. Recently, there has been a shift in perspective r…

Flatbands from Bound States in the Continuum for Orbital Angular Momentum Localization Open

Weiwei Zhu, Hong-yu Zou, Yong Ge, Yin Wang, Zheyu Cheng , et al. · 2024

A flatband material is a system characterized by energy bands with zero dispersion, allowing for the compact localization of wavefunctions in real space. This compact localization significantly enhances inter-particle correlations and ligh…

Three-dimensional valley-contrasting sound Open

Haoran Xue, Yong Ge, Zheyu Cheng, Yi-jun Guan, Jiaojiao Zhu , et al. · 2024

Spin and valley are two fundamental properties of electrons in crystals. The similarity between them is well understood in valley-contrasting physics established decades ago in two-dimensional (2D) materials like graphene—with broken inver…

Realization of Topology-controlled Photonic Cavities in a Valley Photonic Crystal Open

Bei Yan, Baoliang Liao, Fulong Shi, Xiang Xi, Yuan Cao , et al. · 2024

We report an experimental realization of a new type of topology-controlled photonic cavities in valley photonic crystals by adopting judiciously oriented mirrors to localize the valley-polarized edge states along their propagation path. By…

Topological Photonics: introduction to the feature issue Open

Baile Zhang, Romain Fleury, Hannah M. Price, Bo Zhen · 2024

We introduce the feature issue of Optical Materials Express on Topological Photonics.

Inverse design of topological photonic time crystals via deep learning Open

Yang Long, Linyang Zou, Letian Yu, Hao Hu, Xiong Jiang , et al. · 2024

Photonic time crystals are a new kind of photonic system in modern optical physics, leading to devices with new properties in time. However, so far, it is still a challenge to design photonic time crystals with specific topological states …

Topological disclination states and charge fractionalization in a non-Hermitian lattice Open

Rimi Banerjee, Subhaskar Mandal, Yun Yong Terh, Shuxin Lin, Gui-Geng Liu , et al. · 2024

We show that a non-Hermitian lattice with a disclination can host topological disclination states that are induced by on-site gain and loss. The disclination states are inherently non-Hermitian as they do not exist in the limit of zero gai…

Non-Abelian Braiding of Topological Edge Bands Open

Yang Long, Zihao Wang, Chen Zhang, Haoran Xue, Yuxin Zhao , et al. · 2024

Braiding is a geometric concept that manifests itself in a variety of scientific contexts from biology to physics, and has been employed to classify bulk band topology in topological materials. Topological edge states can also form braidin…

On-Chip Vectorial Structured Light Manipulation via Inverse Design Open

Xiaobin Lin, Maoliang Wei, Kunhao Lei, Zijia Wang, Chi Wang , et al. · 2024

On-chip structured light, with potentially infinite complexity, has emerged as a linchpin in the realm of integrated photonics. However, the realization of arbitrarily tailoring a multitude of light field dimensions in complex media remain…

Photonic bilayer Chern insulator with corner states Open

Subhaskar Mandal, Ziyao Wang, Rimi Banerjee, Hau Tian Teo, Peiheng Zhou , et al. · 2024

Photonic Chern insulators can be implemented in gyromagnetic photonic crystals with broken time-reversal (TR) symmetry. They exhibit gapless chiral edge states (CESs), enabling unidirectional propagation and demonstrating exceptional resil…

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