Shiqiang Xia
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View article: Real-imaginary spectrum decomposition of the transparency spectra in microwave dressed Rydberg systems
Real-imaginary spectrum decomposition of the transparency spectra in microwave dressed Rydberg systems Open
To distinguish the contributions of electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) in their applications in precision laser spectroscopy, we propose a real-imaginary spectrum decomposition method to invest…
View article: A Generalized Selectively Relaxed Matrix Splitting Preconditioning Strategy for Three-Dimensional Flux-Limited Multi-Group Radiation Diffusion Equations
A Generalized Selectively Relaxed Matrix Splitting Preconditioning Strategy for Three-Dimensional Flux-Limited Multi-Group Radiation Diffusion Equations Open
Driven by the challenging task of pursuing the robust and accurate iterative numerical solution of the three-dimensional flux-limited multi-group radiation diffusion equations in an efficient and scalable manner, we propose and analyze a g…
View article: Itinerant ferromagnetism entrenched by the anisotropy of spin-orbit coupling in a dipolar Fermi gas
Itinerant ferromagnetism entrenched by the anisotropy of spin-orbit coupling in a dipolar Fermi gas Open
We investigate the the itinerant ferromagnetism in a dipolar Fermi atomic system with the anisotropic spin-orbit coupling (SOC),which is traditionally explored with isotropic contact interaction.We first study the ferromagnetism transition…
View article: Soliton molecules and their scattering by a localized <i>P</i> <i>T</i>-symmetric potential in atomic gases
Soliton molecules and their scattering by a localized <i>P</i> <i>T</i>-symmetric potential in atomic gases Open
We propose a physical scheme to study the formation of optical soliton molecules (SMs), consisting of two solitons bound together with a π -phase difference, and the scattering of SMs by a localized parity-time ( P T )-symmetric potential.…
View article: Observation of polarization-dependent optical Tamm states in heterostructures containing hyperbolic metamaterials in the near-infrared region
Observation of polarization-dependent optical Tamm states in heterostructures containing hyperbolic metamaterials in the near-infrared region Open
In the heterostructure composed of metal and one-dimensional photonic crystal (1DPC), the optical Tamm state (OTS) can be excited directly without the coupling of prism or grating, but it is strongly dependent on the photonic band gap (PBG…
View article: ITO-based metamaterials for polarization-independent wide-angle mid-infrared thermal radiation
ITO-based metamaterials for polarization-independent wide-angle mid-infrared thermal radiation Open
View article: Symmetry-protected higher-order exceptional points in staggered flatband rhombic lattices
Symmetry-protected higher-order exceptional points in staggered flatband rhombic lattices Open
Higher-order exceptional points (EPs), which appear as multifold degeneracies in the spectra of non-Hermitian systems, are garnering extensive attention in various multidisciplinary fields. However, constructing higher-order EPs still rema…
View article: Robustness versus sensitivity in non-Hermitian topological lattices probed by pseudospectra
Robustness versus sensitivity in non-Hermitian topological lattices probed by pseudospectra Open
Non-Hermitian topological systems simultaneously posses two antagonistic features: ultra sensitivity due to exceptional points and robustness of topological zero energy modes, and it is unclear which one prevails under different perturbati…
View article: Higher-order exceptional point and Landau–Zener Bloch oscillations in driven non-Hermitian photonic Lieb lattices
Higher-order exceptional point and Landau–Zener Bloch oscillations in driven non-Hermitian photonic Lieb lattices Open
We propose a scheme to realize parity-time (PT) symmetric photonic Lieb lattices of ribbon shape and complex couplings, thereby demonstrating the higher-order exceptional point (EP) and Landau–Zener Bloch (LZB) oscillations in the presence…
View article: Band evolution and Landau-Zener Bloch oscillations in strained photonic rhombic lattices
Band evolution and Landau-Zener Bloch oscillations in strained photonic rhombic lattices Open
We investigate band evolution of chiral and non-chiral symmetric flatband photonic rhombic lattices by applying a strain along the diagonal direction, and thereby demonstrating Landau-Zener Bloch (LZB) oscillations in the presence of a ref…
View article: The generating and modulating characteristics of bound states in the continuum for both TE and TM polarizations by one-dimensional photonic crystal slabs
The generating and modulating characteristics of bound states in the continuum for both TE and TM polarizations by one-dimensional photonic crystal slabs Open
Optical bound states in the continuum (BICs) are capable of manipulating the polarization, confinement, and coupling of light with infinitely high-quality factor. The emerging design based on photonic crystal slabs has led to the realizati…
View article: Nonreciprocal Tamm plasmon absorber based on lossy epsilon-near-zero materials
Nonreciprocal Tamm plasmon absorber based on lossy epsilon-near-zero materials Open
Contrary to conventional Tamm plasmon (TP) absorbers of which narrow absorptance peaks will shift toward short wavelengths (blueshift) as the incident angle increases for both transverse magnetic (TM) and transverse electric (TE) polarizat…
View article: Quasiperiodic metamaterials empowered non-metallic broadband optical absorbers
Quasiperiodic metamaterials empowered non-metallic broadband optical absorbers Open
Realizing a polarization-insensitive broadband optical absorber plays a key role in the implementation of microstructure optoelectrical devices with on-demand functionalities. However, the challenge is that most of these devices involve th…
View article: Author response for "Correspondences between high‐frequency sequences and the Milankovitch Cycles of Dongying Formation in Liaoxi Uplift, Bohai Bay Basin, North‐east China"
Author response for "Correspondences between high‐frequency sequences and the Milankovitch Cycles of Dongying Formation in Liaoxi Uplift, Bohai Bay Basin, North‐east China" Open
View article: Author response for "The transition from meandering river delta to braided river delta: Depositional characteristics and controlling factors from the second member of Shanxi Formation to the eighth member of Lower Shihezi Formation in Southeastern Ordos Basin transition from meandering river delta to braided river delta"
Author response for "The transition from meandering river delta to braided river delta: Depositional characteristics and controlling factors from the second member of Shanxi Formation to the eighth member of Lower Shihezi Formation in Southeastern Ordos Basin transition from meandering river delta to braided river delta" Open
The Ordos Basin, as one of the most petroliferous basins in China, hosts 12.9 billion tons of oil reserves and 15.2 trillion cubic meters of natural gas reserves. The extensive hydrocarbon exploration and production shows that the southeas…
View article: Direct Observation of Flatband Loop States Arising from Nontrivial Real-Space Topology
Direct Observation of Flatband Loop States Arising from Nontrivial Real-Space Topology Open
Topological properties of lattices are typically revealed in momentum space using concepts such as the Chern number. Here, we study unconventional loop states, namely, the noncontractible loop states (NLSs) and robust boundary modes, media…
View article: Photonic flat-band lattices and unconventional light localization
Photonic flat-band lattices and unconventional light localization Open
Flat-band systems have attracted considerable interest in different branches of physics in the past decades, providing a flexible platform for studying fundamental phenomena associated with completely dispersionless bands within the whole …
View article: Novel phenomena in flatband photonic structures: from localized states to real-space topology
Novel phenomena in flatband photonic structures: from localized states to real-space topology Open
In recent years, flatband systems have aroused considerable interest in different branches of physics, from condensed-matter physics to engineered flatband structures such as in ultracold atoms, various metamaterials, electronic materials,…
View article: Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching
Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching Open
We demonstrate experimentally the existence of compact localized states (CLSs) in a quasi-one-dimensional photonic rhombic lattice in the presence of two distinct refractive-index gradients (i.e., a driven lattice ribbon) acting as externa…
View article: Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching
Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching Open
We demonstrate experimentally the existence of compact localized states (CLSs) in a quasi-one-dimensional photonic rhombic lattice in presence of two distinct refractive-index gradients (i.e., a driven lattice ribbon) acting as external di…
View article: The Generalized Analytical Expression for the Resonance Frequencies of Plasmonic Nanoresonators Composed of Folded Rectangular Geometries
The Generalized Analytical Expression for the Resonance Frequencies of Plasmonic Nanoresonators Composed of Folded Rectangular Geometries Open
A robust generalized analytical expression for resonance frequencies of plasmonic nanoresonators, which consists of folded rectangular structures, is proposed based on a circuit route. The formulation is rigorously derived from the lumped …
View article: Unconventional Flatband Line States in Photonic Lieb Lattices
Unconventional Flatband Line States in Photonic Lieb Lattices Open
Flatband systems typically host "compact localized states" (CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless energy band. Using a photonic Lieb lattice (LL), such conv…
View article: Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating
Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating Open
View article: Observation of localized flat-band states in Kagome photonic lattices
Observation of localized flat-band states in Kagome photonic lattices Open
We report the first experimental demonstration of localized flat-band states in optically induced Kagome photonic lattices. Such lattices exhibit a unique band structure with the lowest band being completely flat (diffractionless) in the t…
View article: Observation of self-trapping and rotation of higher-band gap solitons in two-dimensional photonic lattices
Observation of self-trapping and rotation of higher-band gap solitons in two-dimensional photonic lattices Open
We demonstrate self-trapping and rotation of higher-band dipole and quadruple-like gap solitons by single-site excitation in a two-dimensional square photonic lattice under self-focusing nonlinearity. Experimental results show that the sec…