449 citations · 1.3k across the 22 of their papers we have counts for
22 papers
Exceptional Points in Photonics: From Non-Hermitian Physics to Applications
Fan Zhang, Nikolay Solodovchenko, Dmitrii N. Maksimov +5
Open photonic systems provide a versatile platform for non-Hermitian physics, enabling control over complex spectra, transport, and light-matter interactions. Exceptional points (E…
Janus Bound States in the Continuum with Asymmetric Topological Charges
Meng Kang, Meng Xiao, C. T. Chan
We propose a novel topological defect called Janus bound states in the continuum (BICs), featuring asymmetric topological charges in upward and downward radiation channels. Our app…
Applications of Bound States in the Continuum in Photonics
Meng Kang, Tao Liu, C. T. Chan +1
Bound states in the continuum (BICs) have attracted attention in photonics owing to their interesting properties. For example, BICs can effectively confine light in a counter-intui…
Restoration of non-Hermitian bulk-boundary correspondence by counterbalancing skin effect
Yi-Xin Xiao, Zhao-Qing Zhang, C. T. Chan
The non-Hermitian skin effect (NHSE) undermines the conventional bulk-boundary correspondence (BBC) since it results in a distinct bulk spectrum in open-boundary systems compared t…
Experimental realization of stable exceptional chains protected by non-Hermitian latent symmetries unique to mechanical systems
Xiaohan Cui, Ruo-Yang Zhang, Xulong Wang +3
Lines of exceptional points are robust in the 3-dimensional non-Hermitian parameter space without requiring any symmetry. However, when more elaborate exceptional structures are co…
Experimental demonstration of non-adjacent band topology connecting multiple nodal links
Dongyang Wang, Biao Yang, Mudi Wang +5
Nodal links are special configurations of band degeneracies in the momentum space, where nodal line branches encircle each other. In PT symmetric systems, nodal lines can be topolo…
Edge and corner states in 2D non-Abelian topological insulators from an eigenvector frame rotation perspective
Tianshu Jiang, Ruo-Yang Zhang, Qinghua Guo +2
We propose the concept of 2D non-Abelian topological insulator which can explain the energy distributions of the edge states and corner states in systems with parity-time symmetry.…
Topological classification for intersection singularities of exceptional surfaces in pseudo-Hermitian systems
Hongwei Jia, Ruo-Yang Zhang, Jing Hu +3
Exceptional points play a pivotal role in the topology of non-Hermitian systems, and significant advances have been made in classifying exceptional points and exploring the associa…
Symmetry-protected topological exceptional chains in non-Hermitian crystals
Ruo-Yang Zhang, Xiaohan Cui, Wen-Jie Chen +2
In non-Hermitian systems, the defective band degeneracies, so-called exceptional points (EPs), can form robust exceptional lines (ELs) in 3D momentum space in the absence of any sy…
Observation of boundary induced chiral anomaly bulk states and their transport properties
Mudi Wang, Qiyun Ma, Shan Liu +5
The robust transport of edge modes is perhaps the most useful property of topological materials. The existence of edge modes is guaranteed by the bulk-edge correspondence, which st…
Second Chern crystals in four-dimensional synthetic translation space with inherently nontrivial topology
Xiao-Dong Chen, Fu-Long Shi, Jian-Wei Liu +4
Topological states, first known as quantum Hall effect or Chern insulating crystal, have been generalized to many classical wave systems where potential applications such as robust…
Topology in non-Hermitian Chern insulators with skin effect
Yi-Xin Xiao, C. T. Chan
The non-Hermitian skin effect can arise in materials that have asymmetric hoppings between atoms or resonating units, which makes the bulk eigenspectrum sensitive to boundary condi…
Four-band non-Abelian topological insulator and its experimental realization
Tianshu Jiang, Qinghua Guo, Ruo-Yang Zhang +3
Very recently, increasing attention has been focused on non-Abelian topological charges, e.g. the quaternion group Q8. Different from Abelian topological band insulators, these sys…
Photonic nodal lines with quadrupole Berry curvature distribution
Dongyang Wang, Biao Yang, Ruo-Yang Zhang +4
In periodic systems, nodal lines are loops in the three-dimensional momentum space where two bands are degenerate with each other. Nodal lines exhibit rich topological features as…
Casimir induced instabilities at metallic surfaces and interfaces
Kun Ding, Daigo Oue, C. T. Chan +1
Surface plasmons subject to a surface distortion split asymmetrically in energy resulting in a net lowering of zero-point energy. This is because surface plasmon eigenvalues are th…
Angle-Resolved Thermal Emission Spectroscopy Characterization of Non-Hermitian Meta-Crystals
Fan Zhong, Kun Ding, Ye Zhang +3
We establish the angle-resolved thermal emission spectroscopy (ARTES) as a new platform to characterize the intrinsic eigenmode properties of non-Hermitian systems. This method can…
Realization of complex conjugate media using non-PT-symmetric photonic crystals
Xiaohan Cui, Kun Ding, Jianwen Dong +1
While parity-time (PT)-symmetric systems can exhibit real spectra in the exact PT-symmetry regime, the PT-symmetry is actually not a necessary condition for the real spectra. Here…
Machine prediction of topological transitions in photonic crystals
Bei Wu, Kun Ding, C. T. Chan +1
We train artificial neural networks to distinguish the geometric phases of a set of bands in 1D photonic crystals. We find that the trained network yields remarkably accurate predi…
Dynamically encircling an exceptional point in anti-PT-symmetric systems: asymmetric mode switching for symmetry-broken states
Xu-Lin Zhang, Tianshu Jiang, Hong-Bo Sun +1
Dynamically encircling an exceptional point (EP) in parity-time (PT) symmetric systems shows an interesting chiral dynamics, leading to asymmetric mode switching in which the outpu…
Experimental demonstration of an anisotropic exceptional point
Kun Ding, Guancong Ma, Z. Q. Zhang +1
Exceptional points (EPs) associated with a square-root singularity have been found in many non-Hermitian systems. In most of the studies, the EPs found are isotropic meaning that t…
Dynamically encircling exceptional points: in situ control of encircling loops and the role of the starting point
Xu-Lin Zhang, Shubo Wang, Bo Hou +1
The most intriguing properties of non-Hermitian systems are found near the exceptional points (EPs) at which the Hamiltonian matrix becomes defective. Due to the complex topologica…
Deterministic formation of interface states in some two-dimensional photonic crystals with conical dispersions
Xueqin Huang, Meng Xiao, Zhao-Qing Zhang +1
There is no assurance that interface states can be found at the boundary separating two materials. As a strong perturbation typically favors wave localization, it is natural to exp…