A5006053938- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Semiconductor Quantum Structures and Devices
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Solid-state spectroscopy and crystallography
- Cosmology and Gravitation Theories
- GaN-based semiconductor devices and materials
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Ruminant Nutrition and Digestive Physiology
- Genetic and phenotypic traits in livestock
- Advanced Semiconductor Detectors and Materials
- Cancer-related molecular mechanisms research
- Semiconductor materials and devices
- Inorganic Fluorides and Related Compounds
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Photocathodes and Microchannel Plates
- Molecular Spectroscopy and Structure
- Medical Imaging Techniques and Applications
- Chalcogenide Semiconductor Thin Films
- Optical Polarization and Ellipsometry
Yalong Hydro (China)
2018-2024
Anhui Agricultural University
2023-2024
National and Kapodistrian University of Athens
2023
Ruhr University Bochum
2023
Duke University
2021-2022
William & Mary
2021
Williams (United States)
2021
Northwestern University
2021
Nanjing University
2009
Oklahoma State University
1990-1994
We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (m_{χ}) via WIMP-nucleus spin-independent scattering Migdal effect incorporated. Analysis time-integrated (TI) and annual modulation (AM) effects CDEX-1B data are performed, 737.1 kg day exposure 160 eVee threshold for TI analysis, 1107.5 250 AM analysis. The sensitive windows in m_{χ} expanded by an order magnitude to lower DM New limits σ_{χN}^{SI} at 90% confidence level derived as...
We report the first results of a light weakly interacting massive particles (WIMPs) search from CDEX-10 experiment with 10 kg germanium detector array immersed in liquid nitrogen at China Jinping Underground Laboratory physics data size 102.8 day. At an analysis threshold 160 eVee, improved limits 8×10^{-42} and 3×10^{-36} cm^{2} 90% confidence level on spin-independent spin-dependent WIMP-nucleon cross sections, respectively, WIMP mass (m_{χ}) 5 GeV/c^{2} are achieved. The lower reach m_{χ}...
We report constraints on the dark photon effective kinetic mixing parameter (${\kappa}$) with data taken from two ${p}$-type point-contact germanium detectors of CDEX-10 experiment at China Jinping Underground Laboratory. The 90\% confidence level upper limits ${\kappa}$ solar 205.4 kg-day exposure are derived, probing new space masses (${m_V}$) 10 to 300 eV/${c^2}$ in direct detection experiments. Considering as cosmological matter, ${m_V}$ 0.1 4.0 keV/${c^2}$ set 449.6 data, a minimum...
Recently a dark matter–electron (DM–electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense examination as well. In this Letter, velocity components analysis (VCA) method dedicated to swift of DM–electron interactions via semiconductor detectors is proposed and first HPGe detector-based realized. Utilizing method, germanium based constraint on sub-GeV solar reflected interaction presented...
We report the first observation of a confined-to-propagating transition LO phonons in GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As superlattices (SL's). Picosecond Raman scattering was used to investigate generation rate nonequilibrium GaAs two series SL's with constant layer widths (${\mathit{L}}_{\mathit{z}}$) and x, while ${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As (${\mathit{L}}_{\mathit{b}}$'s) varied. In...
The intensity of polarized-light Raman scattering from a localized vibration point defect in crystal is discrete average over all the possible orientations defect. Much information contained tensor vibrational mode hidden by this averaging. Partial or complete preferential reorientation destruction defect, achieved so-called orientating operator $\stackrel{^}{F}$, alters and permits principle determination symmetry nature modes, relative values elements tensor. A discussion based on group...
Introduction This study evaluated the effects of Isatis Leaf (ISL) on growth performance, gastrointestinal tissue morphology, rumen and intestinal microbiota, rumen, serum urine metabolites, epithelial transcriptome fattening sheep. Methods Twelve 3.5-month-old healthy sheep were randomly divided into two groups, each with 6 replicates, fed basal diet (CON) supplemented 80 g/kg ISL for 2.5 months. Gastrointestinal tract was collected histological analysis, fluid feces subjected to...
The behavior-type analysis method of the polarized Raman scattering intensities on preferentially or randomly oriented defects described in preceding paper was applied to study two types perturbed interstitial hydrogen atom (${\mathrm{H}}_{i}^{0}$) centers alkali halides doped with halogen impurities ${Y}^{\ensuremath{-}}$, heavier than host ion ${X}^{\ensuremath{-}}$. This allows one determine symmetry defect, nature its vibrational modes, and components tensor. In a series six crystals we...
We have developed a low-energy electron recoil (ER) calibration method with 220Rn for the PandaX-II detector. 220Rn, emanated from natural thorium compounds, was fed into detector through xenon purification system. From 2017 to 2019, we performed three dedicated campaigns different radon sources. studied response α, β, and γ particles focus on low energy ER events. During runs in 2018, amount of radioactivity 222Rn were order 1% that particulate contamination negligible, especially 2018....
Mentha haplocalyx Briq (MHB) and its components have been proven to improve the growth performance of livestock poultry. The aim this experiment was investigate effects MHB addition on performance, rumen fecal microbiota, fluid, serum urine metabolism, transcriptomics epithelial cells in meat sheep. Twelve Hu sheep were selected for fed with basic diet (CON) a basal supplemented 80 g/kg DM (MHB). experimental period 10 weeks first 2 as pre-trial period. results showed that compared CON...
The initial generation of hot LO phonons by photoexcited carriers is studied with picosecond Raman spectroscopy in GaAs and a series ${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As samples 0x0.4. A rapid decrease the occupation numbers GaAs-like AlAs-like LO-phonon modes observed as x increased. This cannot be explained if electrons excited from light- heavy-hole bands were primary source generating phonons. It shown that most Raman-active are initially...
Stabilization of a mobile interstitial hydrogen atom by substitutional ${\mathrm{Li}}^{+}$ impurity in KCl leads to ${\mathrm{H}}^{0}$${\mathrm{Li}}^{+}$ center possessing ${C}_{3v}$〈111〉 symmetry. A Raman line at 205 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ is shown be associated with this center. This shows no isotope effect upon $^{6}\mathrm{\ensuremath{-}}^{7}$Li substitution. The behavior-type method developed recently Zhou, Goovaerts, and Schoemaker was applied the analysis polarized...
We have found a very unusual exciton line shape in the vicinity of n=2 heavy hole states (HH2) GaAs/AlxGa1−xAs superlattices. The excitonic structure consisting step, sharp peak, and broad asymmetric hump results from valence-band mixing between HH2 n=1 light states, conjunction with subband dispersion due to well-to-well coupling electrons holes. In quantum well samples negligible dispersion, distinctly different is observed. observed fitted by theory recently reported Chu Chang [Phys. Rev....
Low-temperature (15 K) photoluminescence (PL) in molecular-beam epitaxy-grown AlGaAs/GaAs heterojunction bipolar transistors (HBTs) has been studied. Both cw and pulsed lasers were used as excitation sources. These HBT samples are heavily doped with Si Be the n + -GaAs p layers, respectively. The origin of each PL signal is identified by removing layer. Three peaks from n-AlGaAs layer observed. We found a direct correlation between height device performance (current gain). have also studied...
The authors measure the hot phonon population of GaAs LO phonons using a picosecond Raman scattering technique. Their samples were series GaAs/Al0.4Ga0.6As superlattices (SLS) with fixed well width (Lz) and varying barrier (Lb). An abrupt increase in generation rate was observed as Lb decreased over narrow range. This is interpreted onset significant well-to-well coupling confined phonons. estimate penetration depth into Al0.4Ga0.6As barriers obtained from this transition.