A5085035980- Atmospheric chemistry and aerosols
- Magnetic properties of thin films
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Magnetic Properties and Applications
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Atmospheric Ozone and Climate
- Magnetic and transport properties of perovskites and related materials
- Advanced Memory and Neural Computing
- Atmospheric aerosols and clouds
- Magnetic Properties and Synthesis of Ferrites
- Photonic and Optical Devices
- COVID-19 impact on air quality
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Metallic Glasses and Amorphous Alloys
- Theoretical and Computational Physics
- Mechanical and Optical Resonators
- Magnetic Field Sensors Techniques
- Electromagnetic wave absorption materials
- Optical Network Technologies
- Quantum Information and Cryptography
- Advanced Condensed Matter Physics
Institute of Urban Environment
2022-2025
Chinese Academy of Sciences
2018-2025
Prevention Institute
2025
Lanzhou University
2015-2024
Beijing University of Chemical Technology
2020-2024
Huazhong University of Science and Technology
2024
Shanghai University
2024
North China Electric Power University
2024
University of Chinese Academy of Sciences
2022-2023
China Electronics Technology Group Corporation
2023
Understanding the atmospheric new particle formation (NPF) process within global range is important for revealing budget of aerosols and their impacts. We investigated seasonal characteristics NPF in urban environment Beijing. Aerosol size distributions down to ∼1 nm H2SO4 concentration were measured during 2018–2019. The observed rate 1.5 particles (J1.5) significantly higher than those clean environment, e.g., Hyytiälä, whereas growth not different. Both J1.5 frequency Beijing show a clear...
Current-induced spin torques provide efficient data writing approaches for magnetic memories. Recently, the splitting torque (SST) was theoretically predicted, which combines advantages of conventional transfer (STT) and spin-orbit (SOT) as well enables controllable polarization. Here we experimental evidence SST in collinear antiferromagnet RuO_{2} films. The current direction is found to be correlated crystal orientation polarization dependent on (parallel to) Néel vector. These features...
Abstract Lithium‐sulfur batteries (LSBs) are still limited by the shuttle of lithium polysulfides (LiPS) and slow Li−S reaction. Herein, we demonstrate that when using cobalt sulfide as a catalytic additive, an external magnetic field generated permanent magnet can significantly improve LiPS adsorption ability reaction kinetics. More specifically, results show both experimentally theoretically how electron spin polarization Co ions reduces repulsion enhances degree orbital hybridization,...
This work reviews and examines two particular issues related with the new technique of electrical detection ferromagnetic resonance (FMR). powerful has been broadly applied for studying magnetization spin dynamics over past ten years. The first issue is relation distinction between different mechanisms that give rise to a photovoltage via FMR in spintronic devices, second proper analysis line shape, which become ``Achilles heel'' interpreting experimental results, especially either pumping...
Due to profound impact on climate and human health, air quality has attracted attention from all levels of the civil society. The key step in provision required tools for society tackle complex problem is characterize it a comprehensive manner with long-term perspective. Here, we describe continuous observation station its accompanying state-of-the-art instrumentation that was established investigate urban atmospheric environment rapidly developing Chinese Megacity. station, located downtown...
Abstract. Secondary aerosols are a major component of PM2.5, yet their formation mechanisms in the ambient atmosphere still unclear. Based on field measurements downtown Beijing, we show that photolysis nitrous acid (HONO) may promote organic and nitrate winter which is supported by fact mass concentrations linearly increase as function HONO consumed from early morning to noon. The increased content also leads ammonium particulate matter through enhancing neutralization sulfate ammonia. We...
Abstract. Although secondary particulate matter is reported to be the main contributor of PM2.5 during haze in Chinese megacities, primary particle emissions also affect concentrations. In order improve estimates contribution sources number and mass concentrations, we performed source apportionment analyses using both chemical fingerprints size distributions measured at same site urban Beijing from April July 2018. Both methods resolved factors related emissions, including vehicular cooking...
Out-of-plane spin polarization σ
Abstract. Co-occurrences of high concentrations PM2.5 and ozone (O3) have been frequently observed in haze-aggravating processes the North China Plain (NCP) over past few years. Higher O3 on hazy days were hypothesized to be related nitrous acid (HONO), but key sources HONO enhancing during remain unclear. We added six potential sources, i.e., four ground-based (traffic, soil, indoor emissions, NO2 heterogeneous reaction ground surface (Hetground)) two aerosol-related (the aerosol surfaces...
Abstract. Oxygenated organic molecules (OOMs) are crucial for atmospheric new particle formation and secondary aerosol (SOA) growth. Therefore, understanding their chemical composition, temporal behavior, sources is of great importance. Previous studies on OOMs mainly focus environments where biogenic predominant, yet sites with dominant anthropogenic emissions, such as megacities, have been lacking. Here, we conducted long-term measurements OOMs, covering four seasons the year 2019, in...
Since the discovery of antiferromagnetism, metallic oxide RuO_{2} has exhibited numerous intriguing spintronics properties such as anomalous Hall effect and anisotropic spin splitting effect. However, microscopic origin its antiferromagnetism remains unclear. By investigating torque in RuO_{2}/Py, we found that exhibits a spatially periodic structure which interacts with waves Py through interfacial exchange coupling. The wavelength is evaluated within 14-20 nm depending on temperature,...
Sulfur trioxide (SO3) is a crucial compound for atmospheric sulfuric acid (H2SO4) formation, rain and other physicochemical processes. During the daytime, SO3 mainly produced from photo-oxidation of SO2 by OH radicals. However, sources during early morning night, when radicals are scarce, not fully understood. We report results two field measurements in urban Beijing winter summer 2019, using nitrate-CI-APi-LTOF (chemical ionization-atmospheric pressure interface-long-time-of-flight) mass...
Abstract Cavity magnon polaritons are mixed quasiparticles that arise from the strong coupling between cavity photons and quantized magnons. Combining high-speed with long-coherence-time magnons, such promise to be a potential candidate for quantum information processing. For harnessing coherent contained in spatially distributed polariton states, it is highly desirable manipulate two-dimensional system. Here, we demonstrate tunable transport can achieved by strongly magnons microwave...
The understanding at a molecular level of ambient secondary organic aerosol (SOA) formation is hampered by poorly constrained mechanisms and insufficient analytical methods. Especially in developing countries, SOA related haze great concern due to its significant effects on climate human health. We present simultaneous measurements gas-phase volatile compounds (VOCs), oxygenated molecules (OOMs), particle-phase Beijing. show that condensation the measured OOMs explains 26–39% mass growth,...
Abstract. Organic aerosol (OA) is a major component of fine particulate matter (PM), affecting air quality, human health, and the climate. The absorptive reflective behavior OA components contributes to determining particle optical properties thus their effects on radiative budget troposphere. There limited knowledge influence molecular composition in polluted urban environment. In this study, we characterized oxygenated collected filter samples autumn 2018 Beijing, China, with inlet for...
Relatively high concentrations of preexisting particles, acting as a condensation sink (CS) gaseous precursors, have been thought to suppress the occurrence new particle formation (NPF) in urban environments, yet NPF still occurs frequently. Here, we aim understand factors promoting and inhibiting events Beijing by combining one-year-long measurements number size distributions PM2.5 chemical composition. Our results show that indeed CS is an important factor controlling events, with its...
Abstract New particle formation (NPF) is a global phenomenon that significantly influences climate. NPF also contributes to haze, with pronounced negative impacts on human health. Theory and observations both show nucleation favored during clean days inhibited haze episodes due high pre‐existing condensation sink (CS). Here we the surprising occurrence of in Beijing associated concentration sulfuric acid dimers. With field model simulations, demonstrate downward mixing sulfur dioxide (SO 2 )...
Using numerical simulation, we have studied in detail vacuum electron acceleration driven by two crossed Airy beams with identical characteristics except for opposite accelerating directions. An injected along the longitudinal central axis is only affected combined electric field. In addition, a suitable scheme more beneficial to energy gain of an than single beam [Opt. Lett. 35, 3258 (2010)]. Meanwhile, cross angle, injection electron, and initial phase play significant roles electron.
We systematically study the indirect interaction between a magnon mode and cavity photon mediated by traveling photons of waveguide. From general Hamiltonian, we derive effective coupling strength two separated modes, obtain theoretical expression system's transmission. Accordingly, design an experimental setup consisting shield mode, microstrip line, system to test our predictions. measured transmission spectra, interaction, as well hybridization, modes can be observed. All observations...
Abstract. Although the anthropogenic emissions of SO2 have decreased significantly in China, decrease SO42- PM2.5 is much smaller than that SO2. This implies an enhanced formation rate ambient air, and mechanism still under debate. work investigated particulate sulfate based on statistical analysis long-term observations Shijiazhuang Beijing supported with flow tube experiments. Our main finding was sulfur oxidation ratio (SOR) exponentially correlated RH (SOR = 0.15+0.0032×exp(RH/16.2))...