Large area implementation of bound states in the continuum in a one-dimensional photonic crystal by an optical axis rotating approach.

It is generally accepted that the bound states in the continuum (BICs) are usually realized in a one-dimensional system by the TM-polarized light incident at Brewster's angle. However, the optimal BICs can be achieved only under specific incident light and at a specific polarization incident angle, which poses challenges to its experimental implementation. Serving this purpose, we design a system composed of an anisotropic material (AM) embedded in one-dimensional photonic crystals (1D-PhCs), demonstrating that both TE and TM waves can realize BICs.

Theoretical insights into the thermoelectric transport performance of the MoPGaS monolayer.

Since the MoSiN monolayer was synthesized experimentally, the family of 2D septuple-layer MoSiN-like materials have attracted widespread attention. However, to date, research on such materials in the thermoelectric field has been rarely reported. In this work, combining first-principles calculations and Boltzmann transport equations, we have investigated the electronic and thermal transport properties of the MoPGaS monolayer.

Preparation and activity evaluation of zinc ion delivery system based on fucoidan-zinc complex.

Zinc is a critical trace element in the human body, playing a key role in regulating various protein functions and cellular metabolism. Thus, maintaining zinc homeostasis is essential for human health, as zinc deficiency can directly contribute to the onset of numerous diseases. Effective supplementation with zinc ions offers a viable treatment for zinc deficiency.

V-Based MXene/MAX Heterostructure Composites with Enhancing Dielectric Loss for Broadband Microwave Absorption.

Electromagnetic wave absorption performance is strictly dependent on attenuation and impedance matching, which are directly influenced by the ratio of MXene/MAX in the multilayer structured MXene/MAX composites. However, there is still a challenge to achieve collaborative optimization of dielectric loss and impedance matching by precisely regulating the proportional relationship of MXene/MAX. Herein, V-based MXene/MAX heterostructure composites with different VC/VAlC ratios were successfully synthesized by rationally controlling the temperature and time of the hydrothermal reaction.

Lattice matching and halogen regulation for synergistically induced large Li and Na storage by halogenated MXene VCCl.

Suffering from the formation of metal-ion dendrites and low storage capacity, MXene materials exhibit unsatisfactory performance in Li and Na storage. In this study, we demonstrate that the MXene VCCl structure can induce uniform Li and Na deposition. This is achieved through coherent heterogeneous interface reconstruction and regulated ion tiling by halogen surface termination.

Experimental investigation of the period-adding bifurcation route to chaos in plasma.

Since the characteristic timescales of the various transport processes inside the discharge plasma span several orders of magnitude, it can be regarded as a typical fast-slow system. Interestingly, in this work, a special kind of complex oscillatory dynamics composed of a series of large-amplitude relaxation oscillations and small-amplitude near-harmonic oscillations, namely, mixed-mode oscillations (MMOs), was observed. By using the ballast resistance as the control parameter, a period-adding bifurcation sequence of the MMOs, i.

Symmetry-breaking-induced ferroelectric HfSnX monolayers and their tunable Janus structures: promising candidates for photocatalysts and nanoelectronics.

Designing novel two-dimensional (2D) ferroelectric materials by symmetry breaking and studying their mechanisms play important roles in the discovery of new ferroelectric photocatalysts and nanoelectronics. In this study, we have systematically investigated a series of novel ferroelectric 2D HfSnX (X = S, Se and Te) monolayers through first-principles calculations. We found that each HfSnX monolayer contains a stable ferroelectric phase (FP) and a paraelectric phase (PP).

Experimental observations of communication in blackout, topological waveguiding and Dirac zero-index property in plasma sheath.

The plasma sheath causes the spacecraft's communication signal to attenuate dramatically during the re-entry period, which seriously threatens the astronauts. However, valid experimental protocols have not been obtained hitherto. To realize the propagation of electromagnetic waves in negative permittivity background of the plasma sheath, alumina columns are embedded in the plasma background to form plasma photonic crystals, which can support the coupling of evanescent waves between the alumina columns.

Structural Engineering Enabled Bimetallic (Ti Nb ) AlC Solid Solution Structure for Efficient Electromagnetic Wave Absorption in Gigahertz.

Microstructures play a critical role to influence the polarization behavior of dielectric materials, which determines the electromagnetic response ability in gigahertz. However, the relationship between them, especially in the solid-solution structures is still absent. Herein, a series of (Ti Nb ) AlC MAX phase solid solutions with nano-laminated structures have been employed to illuminate the aforementioned problem.

Multifunctional transmission polarization conversion metasurface based on dislocation-induced anisotropy at the terahertz frequency.

Manipulating the polarization state of terahertz waves is critical for terahertz communication systems. This study proposes a terahertz band polarization conversion metasurface based on dislocation-induced anisotropy. Numerical simulation results revealed that the polarization conversion of orthogonal linearly polarized light, orthogonal circularly polarized light, linearly polarized light to circularly polarized light, and circularly polarized light to linearly polarized light can be realized.

Numerical simulation of the bifurcation-remerging process and intermittency in an undriven direct current glow discharge.

As a complex nonlinear medium, gas discharge plasma can exhibit various nonlinear discharge behaviors. In this study, in order to investigate the chaos phenomenon in the subnormal glow region of an undriven direct current glow discharge, a two-dimensional plasma fluid model is established coupled with a circuit model as a boundary condition. Using the applied voltage as control parameter in the simulation, the complete period-doubling bifurcation and inverse period-doubling bifurcation processes in the oscillation region are found, and the influence of the applied voltage on the spatiotemporal distribution of plasma parameters during the bifurcation-remerging process is examined.

High-ratio {100} plane-exposed ZnO nanosheets with dual-active centers for simultaneous photocatalytic Cr(VI) reduction and Cr(III) adsorption from water.

The development of an efficient catalyst for the simultaneous removal of Cr(VI) and Cr(III) from water is required to eliminate the risk of Cr(III) reconversion in the photocatalytic Cr(VI) reduction process. ZnO with large regions of high-energy {001} and {101} surfaces is often used to degrade various pollutants due to its high activity. However, the more readily available low-energy facets have relatively limited its applications.

Using Collisional Electron Spectroscopy to Detect Gas Impurities in an Open Environment: CH-Containing Mixtures.

The collisional electron spectroscopy method for analyzing and determining gaseous impurities was further developed to realize the operation in an open environment. In addition, the method not only facilitates the registration of the impurity components, but also the reactive radicals generated from the discharge reaction. The sandwich-like discharge structure was used to generate a stable, non-local, negative glow equipotential plasma in an open environment, and the - characteristic curve of the plasma was collected using an additional sensor electrode.

Electronic and optical properties of a novel two-dimensional semiconductor material TlPtS: a first-principles study.

Two-dimensional (2D) materials have attracted widespread attention due to their unique physical and chemical properties. Here, by using density functional theory calculations, we suggest a novel 2D TlPtS material whose layered bulk counterpart was synthesized in 1973. Theoretical calculation results indicate that the exfoliating energy of monolayer and bilayer TlPtS is 34.

Electronically controlled flexible terahertz metasurface based on the loss modulation of strontium titanate.

A flexible terahertz metamaterial is designed to control the transmittance through an external electric field. Two different metallic structures, the split ring (type I structure) and the split ring inside a ring (type II structure), were prepared and voltage was applied through a forked finger electrode. The structures were wrapped in a thin film made by mixing strontium titanate nanopowder with polyimide in a certain ratio.

Coaxial double-hole PEDOT: PSS electrodes achieving tunable terahertz zoomable convergence.

The local wavefront modulation technique in the terahertz band is an important basis for the development of terahertz modulation technology. Here, an electrically controlled convergent tunable device based on patterned transparent electrode poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS) is realized to locally tune the terahertz wavefront. The device consists of two substrates with circular-hole electrodes and liquid crystal sandwiched between them.

Low magnetic-field induced high temperature dynamic magnetoelectric coupling performances in Z-type SrCoFeO.

Magnetic-field induced dynamic magnetoelectric coupling effects and polarization performance of Z-type SrCoFeO(SCFO) ceramic has been investigated. Results found that SCFO's transverse tapered magnetic structure can induce electric polarization, and its electric polarization direction will not change under external magnetic effects. First-order dynamic magnetoelectric coupling coefficient () and second-order dynamic magnetoelectric coupling coefficient () of SCFO exhibited strong response main in magnetic structural phase transition region.

Computational Screening of High Activity and Selectivity TM/g-CN Single-Atom Catalysts for Electrocatalytic Reduction of Nitrates to Ammonia.

Electrocatalytic reduction of nitrates (NORR) selectively generating ammonia (NH) opens up a new idea for treating nitrates in wastewater, which not only reduces nitrates but also obtains the valuable product ammonia. By first-principles calculations, we explore the activity and selectivity for NORR to NH of TM/g-CN single-atom catalysts. Six TM/g-CN catalysts (TM = Ti, Os, Ru, Cr, Mn, and Pt) are selected by a four-step screening method.

Active polarization-independent plasmon-induced transparency metasurface with suppressed magnetic attenuation.

A tunable polarization-independent plasmon-induced transparency (PIT) metasurface based on connected half-ring and split-ring resonators is proposed to working in the terahertz band. We analyze the PIT effect in metasurfaces comprising of ring resonator and split ring resonator. Due to the magnetic attenuation caused by the reverse current between the two resonators, the relative position of the ring resonator and the split-ring resonator greatly affects the strength of the PIT effect.

Manganese-doping enhanced local heterogeneity and piezoelectric properties in potassium tantalate niobate single crystals.

Ion doping, an effective way to modify the nature of materials, is beneficial for the improvement of material properties. Mn doping exhibits gain of piezoelectric properties in KTa Nb O (KTN). However, the impact mechanism of Mn ions on properties remains unclear.

Photovoltaic properties in an orthorhombic Fe doped KTN single crystal.

Since the domain wall photovoltaic effect (DW-PVE) is reported in BiFeO film, the investigations on photovoltaic properties in ferroelectrics have appealed more and more attention. In this work, we employed two Fe doped KTaNbxO (Fe:KTN) single crystals in tetragonal phase and orthorhombic phase, respectively, possessing similar net polarization along [001] direction, to quantize the contribution on photovoltaic properties from bulk photovoltaic effect (BPVE) and DW-PVE in Fe:KTN. The results show that there are significant enhancements of open-circuit voltages (V = -6.

Super terahertz phase shifter achieving high transmission and large modulation depth.

We propose an industrial-grade liquid-crystal-based terahertz (THz) 2π-phase shifter with predictable ultra-high amplitude transmittance. The phase retardation reaches 360.5° at 1.

Formation of inverse electron distribution function and absolute negative conductivity in nonlocal plasma of a dc glow discharge.

The inversion of the electron energy distribution function (EEDF) at low energies and the absolute negative electron conductivity are predicted and confirmed by numerical modeling of a direct current glow discharge in argon. It is shown that, in contrast to the local approximation used earlier for searching the inverse EEDF, in a real gas-discharge plasma, the formation of the EEDF is significantly affected by the terms with spatial gradients in the Boltzmann kinetic equation. In analogy with the inverse population of excited states in lasers, such a medium will amplify electromagnetic waves.

Ultra-large electric field-induced strain in potassium sodium niobate crystals.

Electromechanical coupling in piezoelectric materials allows direct conversion of electrical energy into mechanical energy and vice versa. Here, we demonstrate lead-free (K Na )NbO single crystals with an ultrahigh large-signal piezoelectric coefficient * of 9000 pm V, which is superior to the highest value reported in state-of-the-art lead-based single crystals (~2500 pm V). The enhanced electromechanical properties in our crystals are realized by an engineered compositional gradient in the as-grown crystal, allowing notable reversible non-180° domain wall motion.

Efficient terahertz polarization conversion with hybrid coupling of chiral metamaterial.

We propose an ultrathin terahertz waveplate of bi-layer chiral metamaterial for cross-polarization conversion at asymmetric transmission. The chiral metamaterial is constructed with hybrid coupling plasmonic resonators of a concentric ring and a double-split ring. The terahertz metamaterial can efficiently convert the ${y}$y-polarized wave into the ${x}$x-polarized wave with the cross-polarized transmittance over 97% and the polarization conversion ratio of 99% in simulation.