A5036818537- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Semiconductor Quantum Structures and Devices
- Nanocluster Synthesis and Applications
- Catalytic Processes in Materials Science
- Advanced Chemical Physics Studies
- Ga2O3 and related materials
- Semiconductor materials and devices
- Inorganic Chemistry and Materials
- Graphene research and applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Silicon Carbide Semiconductor Technologies
- Boron and Carbon Nanomaterials Research
- Crystallization and Solubility Studies
- Electronic and Structural Properties of Oxides
- Particle Accelerators and Free-Electron Lasers
- Plasmonic and Surface Plasmon Research
- X-ray Diffraction in Crystallography
- Geomagnetism and Paleomagnetism Studies
- Quantum Dots Synthesis And Properties
- Molecular Sensors and Ion Detection
- Hydrogen Storage and Materials
- Gold and Silver Nanoparticles Synthesis and Applications
Chinese Academy of Sciences
2001-2025
Institute of Modern Physics
2021-2025
Beijing Institute of Petrochemical Technology
2024
Mongolian National University
2024
Institute of Soil Science
2022-2024
Research Center for Eco-Environmental Sciences
2015-2023
State Key Laboratory of Environmental Chemistry and Ecotoxicology
2023
Tiangong University
2022-2023
Institute of Semiconductors
2013-2022
Institute of Geology and Geophysics
2020-2022
We report on a comprehensive combined experimental and theoretical study of Curie temperature trends in (Ga,Mn)As ferromagnetic semiconductors. Broad agreement between expectations measured data allows us to conclude that ${T}_{c}$ high-quality metallic samples increases linearly with the number uncompensated local moments ${\mathrm{Mn}}_{\mathrm{Ga}}$ acceptors, no sign saturation. Room ferromagnetism is expected for 10% concentration these moments. Our magnetotransport magnetization are...
First-principles calculations are carried out to investigate the hydrogen separation characteristics of two-dimensional carbon allotropes consisting sp- and sp2-hybridized atoms, i.e., graphyne, graphdiyne, rhombic-graphyne. The selectivities for H2 over several gas molecules, including CO, N2, CH4, found be sensitive pore sizes shapes. penetration barriers generally decrease exponentially with sizes. Our results reveal that graphyne small pores is unsuitable purpose separation. Graphdiyne,...
We have performed a systematic investigation of magnetotransport series as-grown and annealed ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ samples with $0.011\ensuremath{\leqslant}x\ensuremath{\leqslant}0.09$. find that the anisotropic magnetoresistance (AMR) generally decreases increasing magnetic anisotropy, Mn concentration on low temperature annealing. show uniaxial anisotropy can be clearly observed from AMR for $x\ensuremath{\geqslant}0.02$. This becomes dominant at...
Graphyne, consisting of sp- and sp2-hybridized carbon atoms, is a new member allotropes which has natural porous structure. Here, we report our first-principles calculations on the possibility Li-decorated graphyne as hydrogen storage medium. We predict that Li-doping significantly enhances ability compared to pristine graphyne, can be attributed polarization H2 molecules induced by charge transfer from Li atoms graphyne. The favorite adsorption configurations single side both sides layer...
The geometries, electronic, and magnetic properties of the 3d transition-metal-doped gold cluster: M@Au6 clusters (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni) have been systematically investigated by using relativistic all-electron density functional theory with generalized gradient approximation. It is found that all ground states doped an open d shells transition-metal atom are planar structures, in which transition metal located center Au6 ring. All show larger relative binding energies compared...
A novel sol-gel route to c-axis oriented undoped and Co, Fe Mn doped ZnO films is reported. Sols were prepared from a hydrated zinc acetate precursor dimethylformamide (DMF) solvent. Films spin-coated on hydrophilic sapphire substrates then dried, annealed post-annealed, producing almost purely uniaxial nanocrystallites high degree of long-range structural order. Specific orientation hexagonal crystallites demonstrated both perpendicular parallel the substrate surface. Cobalt doping resulted...
Although a high-quality homoepitaxial layer of 4H-silicon carbide (4H-SiC) can be obtained on 4° off-axis substrate using chemical vapor deposition, the reduction defects is still focus research. In this study, several kinds surface in 4H-SiC are systemically investigated, including triangles, carrots, pits, basal plane dislocations, and step bunching. The morphologies structures further discussed via optical microscopy potassium hydroxide-based defect selective etching analysis. Through...
The High-Intensity Heavy-Ion Accelerator Facility (HIAF) is a significant national science and technology infrastructure project, constructed by the Institute of Modern Physics, Chinese Academy Sciences (IMP, CAS). It designed to provide intense proton, heavy ion beams, target-produced radioactive beams for nuclear physics related research. Large-aperture, high-precision, room-temperature, superconducting dipole magnets are extensively used achieve high-intensity beams. However, large-scale...
Well-aligned nanowire arrays have been synthesized by anodic oxidative hydrolysis of within a hexagonal close-packed nanochannel alumina on an Au substrate. X-ray diffraction spectrum, Raman scattering scanning electron microscopy, and transmission microscopy analysis show that the single-crystalline anatase nanowires, 15 nm in diam, are uniformly assembled into highly ordered pores alumina. Finally, growth mechanism nanowires is discussed. The well-aligned will be useful for study...
We demonstrated a first-principles investigation to search for magnetic superatoms in the vanadium-doped lithium clusters VLi(n) (n = 1-13). The stabilities of were determined through geometrical and electronic optimizations. It is found that growth pattern 3-space follows adding Li atom capped on VLi(n-1) clusters. All doped show larger relative binding energies compared with pure Li(n+1) partners display tunable properties. When n 8-13, adopt cage-like structure an endohedral V are...
This paper investigates the design and experimental method of a high magnetic field measurement system based on <sup>3</sup>He single-beam hybrid optical pumping nuclear resonance (NMR) gyroscope, aiming to improve accuracy stability by using quantum technology meet needs modern navigation power grid systems for high-precision measurement. In this paper, basic operation principle NMR gyroscope is firstly presented, including spin hyperpolarization technique, process precession absorption...
GaN/AlGaN double barrier resonant tunnelling structures grown by molecular beam epitaxy on GaN templates have been studied. Peaks in the I(V) characteristics are observed, which similar to peaks seen conventional III–V based devices. However, behaviour of depend upon previous charge-state device produced electrical bias. Current instabilities also observed at low voltages. The possible origin room temperature and 4 K is discussed. (© 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
We report on a comprehensive study of the ferromagnetic moment per Mn atom in (Ga,Mn)As semiconductors. Theoretical discussion is based microscopic calculations and an effective model local moments antiferromagnetically coupled to valence band hole spins. The validity over range doping studied assessed by comparing with tight-binding/coherent-potential approximation calculations. Using virtual crystal $\mathbf{k}∙\mathbf{p}$ for states, we evaluate zero-temperature mean-field contributions...
Large-scale SiO2 nanodisk arrays fabricated by nanospherical-lens lithography are embedded in the n-GaN and p-GaN layer of an InGaN/GaN light-emitting diode (LED) to produce photonic crystal (PC) structures for efficiency improvement. Following obvious reduction view angle, light output power bottom, top, double PC LEDs is enhanced 74.5%, 60.1%, 88.2% compared that a conventional LED at 350 mA current, respectively. Despite external quantum due improved crystalline quality extraction, these...
This paper conducts a research on modulation characteristics of blue light-emitting diodes (LEDs) used in visible-light communication (VLC) system. Through analysis the LEDs with different emitting sizes, we find that there is similar linear relationship between LED's 3dB bandwidth and operation current density. experiment also shows high series resistance one major issue limits our speed. To further improve LED bandwidth, can be reduced by optimizing device layout as well reducing material...
We demonstrate a TE/TM polarization-independent plasmonic subtractive color filtering scheme employing ultrathin two-dimensional Ag nanodisks. These filters exhibit small feature sizes (below 200 nm) and high transmission up to 70% in the visible spectral region, superior previously reported filters. Simulated optical spectra colors are good agreement with experimental results. The color-filtering behaviors strongly depend on thickness period of Underlying mechanisms also discussed detail.
In this work, efficiency droop of InGaN/GaN multiple-quantum-well LEDs with super wide well (WW) is discussed by comparing the external quantum (EQE) GaN grown on sapphire and FS-GaN substrates. The luminescence electrical characteristics these WW are also experimentally theoretically analyzed. With increase width from 3 nm to 6 nm, high V-pits density more strain relaxation found in LED sapphire, which exhibits greatly reduced peak but almost negligible behavior. contrast, despite a larger...
Based on the nanorod structure, we have fabricated GaN-based surface plasmon light-emitting diodes with Ag nanoparticles deposited laterally proximity to multiple quantum wells (MQWs) region, which allows us investigate well - (QW-SP) coupling effect. Our results show that QW-SP effect increases significantly when SP resonant wavelength of is close QW emission wavelength, especially by using a shorter light source, will further enhance spontaneous rate. Combined simulations, find enhancement...