A5080638645- Topological Materials and Phenomena
- Particle physics theoretical and experimental studies
- Magnetic properties of thin films
- Acoustic Wave Phenomena Research
- Quantum Chromodynamics and Particle Interactions
- Metamaterials and Metasurfaces Applications
- High-Energy Particle Collisions Research
- Photonic Crystals and Applications
- Quantum Mechanics and Non-Hermitian Physics
- Magnetic Properties and Applications
- Graphene research and applications
- Mechanical and Optical Resonators
- Magneto-Optical Properties and Applications
- Acoustic Wave Resonator Technologies
- Photonic and Optical Devices
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Ferroelectric and Piezoelectric Materials
- Advanced Thermoelectric Materials and Devices
- Nonlinear Photonic Systems
- Thermal properties of materials
- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Plasmonic and Surface Plasmon Research
- Dark Matter and Cosmic Phenomena
Nanjing University
2016-2025
Collaborative Innovation Center of Advanced Microstructures
2016-2025
Materials Science & Engineering
2016-2025
Jianghan University
2025
Xuzhou Medical College
2025
Jilin Normal University
2024
Shanghai University
2024
Hangzhou Institute of Applied Acoustics
2024
Shandong Jiaotong University
2022-2024
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2023
Optical communications and computing require on-chip nonreciprocal light propagation to isolate stabilize different chip-scale optical components. We have designed fabricated a metallic-silicon waveguide system in which the potential is modulated along length of such that obtained on silicon photonic chip. Nonreciprocal transport one-way mode conversion are demonstrated at wavelength 1.55 micrometers both simulations experiments. Our compatible with conventional complementary...
Phononic crystals have been proposed about two decades ago and some important characteristics such as acoustic band structure negative refraction stimulated fundamental practical studies in materials devices since then. To carefully engineer a phononic crystal an "atom" scale, metamaterials with their inherent deep subwavelength nature triggered more exciting investigations on bulk modulus and/or mass density. Acoustic surface evanescent waves also recognized to play key roles reach imaging...
The studies of topological phases matter have been developed from condensed physics to photonic systems, resulting in fascinating designs robust devices. Recently, higher-order insulators investigated as a novel phase beyond the conventional bulk-boundary correspondence. Previous mainly focused on multipole systems with negative coupling between lattice sites. Here we experimentally demonstrate that second-order insulating without can be realized two-dimensional dielectric crystals. We...
Nonreciprocal wave propagation typically requires strong nonlinear materials to break time reversal symmetry. Here, we utilized a sonic-crystal-based acoustic diode that had broken spatial inversion symmetry and experimentally realized sound unidirectional transmission in this diode. These novel phenomena are attributed different mode transitions as well their associated energy conversion efficiencies among diffraction orders at two sides of the This nonreciprocal could be systematically...
Higher-order topological insulators (HOTIs) which go beyond the description of conventional bulk-boundary correspondence, broaden understanding insulating phases. Being mainly focused on electronic materials, HOTIs have not yet been found in photonic crystals. Here, we propose a type two-dimensional second-order crystals with zero-dimensional corner states and one-dimensional boundary for optical frequencies. All these are topologically nontrivial can be understood based theory polarization....
Single-phase, insulating Bi1−xLaxFeO3 (BLFOx, x=0.05, 0.10, 0.15, 0.20, 0.30, and 0.40) ceramics were prepared. An obvious phase transition from rhombohedral to orthorhombic was observed near x=0.30. It is found that the destructs spin cycloid of BiFeO3 (BFO), therefore, releases locked magnetization enhances magnetoelectric interaction. As a result, improved multiferroic properties BLFO0.30 with remnant polarization (2Pr 2Mr) 22.4μC∕cm2 0.041emu∕g, respectively, established.
van der Waals junctions of two-dimensional materials with an atomically sharp interface open up unprecedented opportunities to design and study functional heterostructures. Semiconducting transition metal dichalcogenides have shown tremendous potential for future applications due their unique electronic properties strong light–matter interaction. However, many important optoelectronic applications, such as broadband photodetection, are severely hindered by limited spectral range reduced...
We report the analysis of spatial energy distribution data for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons}$ obtained with MARK-J detector at PETRA. define quantity "oblateness" to describe flat shape configuration and three-jet structure which is unambiguously observed first time. Our can be explained by quantum chromodynamic predictions production quark-antiquark pairs accompanied hard noncollinear gluons.
Single-phase insulating BiFeO3 ceramics have been synthesized by a simple but effective method that conventional solid state reaction is followed immediately quenching processing. At room temperature, the show metastable, distorted rhombohedral phase and refined structure parameters are presented based on x-ray diffraction. It revealed formations of Fe2+ oxygen deficiency greatly suppressed A well-saturated ferroelectric hysteresis loop with large remnant polarization (2Pr=23.5μC∕cm2)...
Commercial lead-based piezoelectric materials raised worldwide environmental concerns in the past decade. Bi₀.₅Na₀.₅TiO₃-based solid solution is among most promising lead-free candidates; however, depolarization of these solutions a longstanding obstacle for their practical applications. Here we use strategy to defer thermal depolarization, even render depolarization-free 0-3-type composites. This achieved by introducing semiconducting ZnO particles into relaxor ferroelectric...
Abstract Recently, we witnessed a tremendous effort to conquer the realm of acoustics as possible playground test with topologically protected sound wave propagation. In this article, review latest efforts explore waves topological states quantum matter in two- and three-dimensional systems where discuss how spin valley degrees freedom appear highly novel ingredients tailor flow form one-way edge modes defect-immune acoustic waves. Both from theoretical stand point based on contemporary...
Abstract Precise control of solid-state elastic waves’ mode content and coherence is great use nowadays in reinforcing mechanical energy harvesting/storage, nondestructive material testing, wave-matter interaction, high sensitivity sensing, information processing, etc. Its efficacy highly dependent on having transmission channels with lower loss higher degree freedom. Here, we demonstrate experimentally an analog the quantum spin Hall effects a monolithically scalable configuration, which...
Recent explorations of topology in physical systems have led to a new paradigm condensed matters characterized by topologically protected states and phase transition, for example, photonic crystals enabled magneto-optical effects. However, other wave such as acoustics, topological cannot be simply reproduced due the absence similar magnetics-related sound–matter interactions naturally available materials. Here, we propose an acoustic structure creating effective gauge magnetic field sound...
Significance Topological insulators are first discovered in electronic systems. A key factor is the Kramers doublet for spin-1/2 electrons under fermionic time-reversal symmetry <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msubsup> <mml:mi mathvariant="bold-italic">T</mml:mi> mathvariant="bold-italic">f</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> . Unlike electrons,...
Hermitian theories play a major role in understanding the physics of most phenomena. It has been found only past decade that non-Hermiticity enables unprecedented effects such as exceptional points, spectral singularities and bulk Fermi arcs. Recent studies further show can fundamentally change topological band theory, leading to non-Hermitian topology skin effect, confirmed one-dimensional (1D) systems. However, higher dimensions, these remain unexplored experiments. Here, we demonstrate...
Using angle-resolved photoemission spectroscopy, we observe the low-temperature state of A(x)Fe(2-y)Se(2) (A=K, Rb) superconductors to exhibit an orbital-dependent renormalization bands near Fermi level-the d(xy) heavily renormalized compared d(xz)/d(yz) bands. Upon raising temperature above 150 K, system evolves into a in which have depleted spectral weight while remain metallic. Combined with theoretical calculations, our observations can be consistently understood as temperature-induced...
Abstract Acoustics is a classical field of study that has witnessed tremendous developments over the past 25 years. Driven by novel acoustic effects underpinned phononic crystals with periodic modulation elastic building blocks in wavelength scale and metamaterials localized resonant units subwavelength scale, researchers diverse disciplines physics, mathematics, engineering have pushed boundary possibilities beyond those long held as unbreakable limits. More recently, structure designs...
Abstract The quantum spin Hall effect lays the foundation for topologically protected manipulation of waves, but is restricted to one-dimensional-lower boundaries systems and hence limits diversity integration topological photonic devices. Recently, conventional bulk-boundary correspondence band topology has been extended higher-order cases that enable explorations states with codimensions larger than one such as hinge corner states. Here, we demonstrate a in two-dimensional crystal. Owing...
Abstract A meta‐lens is an advanced flat optical device composed of artificial antennas. The amplitude, phase, and polarization incident light can be engineered to satisfy the application requirements meta‐lenses. Meta‐lenses designed achieve a variety functions, such as diffraction‐limited focusing, high focusing efficiency, aberration correlation, which are useful in various scenarios. This review focuses on recent progress meta‐lenses, from fundamentals applications. present challenges...
We report an atomic-scale characterization of ${\mathrm{ZrTe}}_{5}$ by using scanning tunneling microscopy. observe a bulk band gap $\ensuremath{\sim}80\text{ }\text{ }\mathrm{meV}$ with topological edge states at the step and, thus, demonstrate that is two-dimensional insulator. also find applied magnetic field induces energetic splitting states, which can be attributed to strong link between and topology. The relatively large makes potential candidate for future fundamental studies device...
Topological phases of matter have been extensively studied for their intriguing bulk and edge properties. Recently, higher-order topological insulators with boundary states that are two or more dimensions lower than the states, proposed investigated as novel matter. Previous implementations were based on two-dimensional (2D) systems in which 1D gapped 0D localized corner observed. Here we theoretically design experimentally realize a 3D insulator sonic crystal large band gap. We observe...