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Theoretical investigations of population trapping phenomena in atomic four-color,three-step photoionization scheme

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Chinese physics B 2024年第3期33卷 333-340页

作者：卢肖勇孙亚鹏 science and technology on Particle Transport and Separation laboratory Tianjin 300180China Department of Engineering physics Tsinghua UniversityBeijing 100084China

The four-color three-step selective photoionization process of atom is very important in laser isotope separation *** population trapping phenomena and their influences are studied theoretically in monochromatic and non-monochromatic laser fields based on the density matrix theory in this *** evolutions of the photoionization properties of the four-color,three-step process are *** population trapping effects occur intensely in monochromatic excitation,while it gradually turns weak as the laser bandwidth *** effects of bandwidth,Rabi frequency,time delay,and frequency detuning on the population trapping effect are investigated in monochromatic and non-monochromatic laser *** effects of laser process parameters and atomic parameters on the effective selective photoionization are also *** ionization probability and selectivity factors,as evaluation indexes,are difficult to improve synchronously by adjusting systematic ***,the existence of metastable state may play a negative role when its population is low enough.

关键词： population trapping metastable state selective photoionization laser bandwidth

Modulating low-frequency tribocatalytic performance through defects in uni-doped and bi-doped SrTiO_(3)

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Journal of Advanced Ceramics 2024年第8期13卷 1153-1163页

作者： Yjing Xu Yingzhi Meng Xu Xiang Qing Tang Hongfang Zhang Lajun Liu Ju Gao Bo Xu Renhong Liang Longlong Shu Yanmin Jia Wanping Chen School of Physical science and technology Suzhou University of Science and TechnologySuzhou 215009China College of Materials science and Engineering Guilin University of TechnologyGuilin 541004China Key laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China School of science and Key laboratory of Biomedical Functional Materials China Pharmaceutical UniversityNanjing 211198China School of physics and Materials science Guangzhou UniversityGuangzhou 510006China School of physics and Materials science Nanchang UniversityNanchang 330031China School of physics and Information technology Shaanxi Normal UniversityXi'an 710062China School of physics and technology Wuhan UniversityWuhan 430072China

Triboelectrification,a process that transforms mechanical energy into electrical energy through friction,holds promise for eco-friendly wastewater *** study delves into the enhancement of tribocatalytic dye degradation using SrTiO_(3),a material notable for its non-piezoelectric and centrosymmetric *** synthesis of uni-and bi-doped SrTiOs particles,achieved through a solid-state reaction at 100℃,results in a high-purity cubic perovskite *** with rhodium(Rh)and carbon(C)causes crystal lattice contraction,internal stress,and significant oxygen *** changes notably improve tribocatalytic efficiency under solar irradiation,with Rh-doped SrTiO_(3) demonstrating an impressive degradation rate of approximately 88% for Rhodamine B(RhB),along with reaction rate constants near 0.9 h^(-1) at 554 nm and a noticeable *** study highlights that defects introduced by doping are integral to this process,boosting catalytic activity through energy state modification and enhancing surface redox radical ***,these defects are instrumental in generating a flexoelectric field,which markedly influences the separation of electron-hole pairs under solar *** findings illuminate the complex interplay between material composition,defect states,and environmental conditions,paving the way for advanced strategies in environmental remediation through optimized tribocatalytic activity.

关键词： tribocatalysis SrTiO_(3)(STO) doping-induced defects blueshift flexoelectric field

“Buckets effect”in the kinetics of electrocatalytic reactions

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Journal of Energy Chemistry 2024年第2期89卷 388-396,I0010页

作者： Haowen Cui Yan-Xia Chen Hefei National laboratory for Physical sciences at Microscale Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

In this study,we systematically investigated the effect of proton concentration on the kinetics of the oxygen reduction reaction(ORR)on Pt(111)in acidic *** results demonstrate a rectangular hyperbolic relationship,i.e.,the ORR current excluding the effect of other variables increases with proton concentration and then tends to a constant *** consider that this is caused by the limitation of ORR kinetics by the trace oxygen concentration in the solution,which determines the upper limit of ORR kinetics.A model of effective concentration is further proposed for rectangular hyperbolic relationships:when the reactant concentration is high enough to reach a critical saturation concentration,the effective reactant concentration will become a constant *** could be due to the limited concentration of a certain reactant for reactions involving more than one reactant or the limited number of active sites available on the *** study provides new insights into the kinetics of electrocatalytic reactions,and it is important for the proper evaluation of catalyst activity and the study of structureperformance relationships.

关键词： Oxygen reduction reaction Kinetics Zero order Rectangular hyperbolic relationship pH effect

Enhancing I0/I-Conversion Efficiency by Starch Confinement in Zinc-Iodine Battery

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Energy & Environmental Materials 2024年第1期7卷 118-124页

作者： Danyang Zhao Qiancheng Zhu Qiancheng Zhou Wenming Zhang Ying Yu Shuo Chen Zhifeng Ren Institute of Nanoscience and Nanotechnology College of Physical Science and Technology Central China Normal University National & Local Joint Engineering laboratory of New Energy Photoelectric Devices College of Physics Science and Technology Hebei University Department of physics and Tc SUH University of Houston

The redox couple of I0/I-in aqueous rechargeable iodine-zinc（I2-Zn）batteries is a promising energy storage resource since it is safe and costeffective,and provides steady output ***,the cycle life and efficiency of these batteries remain unsatisfactory due to the uncontrolled shuttling of polyiodide（I3-and I5-） and side reactions on the Zn anode.

关键词： aqueous battery conversion efficiency iodine–zinc battery starch confinement

Investigation of an electrode-driven hydrogen plasma method for in situ cleaning of tin-based contamination

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Plasma science and technology 2024年第8期26卷 73-83页

作者：彭怡超叶宗标王思蜀蒲国刘显洋苑聪聪廖加术韦建军余新刚芶富均 Key laboratory of Radiation physics and technology Ministry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu 610064People’s Republic of China Institute of Atomic and Molecular physics Sichuan UniversityChengdu 610064People’s Republic of China Institute of High Performance Scientific computation Xihua UniversityChengdu 610039People’s Republic of China School of Engineering science University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

To prolong the service life of optics,the feasibility of in situ cleaning of the multilayer mirror(MLM)of tin and its oxidized contamination was investigated using hydrogen plasma at different power *** tin-based contamination consisting of micro-and macroparticles was deposited on silicon via physical vapor deposition(PVD).The electrodedriven hydrogen plasma at different power levels was systematically diagnosed using a Langmuir probe and a retarding field ion energy analyzer(RFEA).Moreover,the magnitude of the self-biasing voltage was measured at different power levels,and the peak ion energy was corrected for the difference between the RFEA measurements and the self-biasing voltage(E_(RFEA)-eV_(self)).XPS analysis of O 1s and Sn 3d peaks demonstrated the chemical reduction process after 1 W *** of surface and cross-section morphology revealed that holes emerged on the upper part of the macroparticles while its bottom remained *** and folds appeared on the upper part of the microparticles,confirming the top-down cleaning mode with hydrogen *** study provides an in situ electrode-driven hydrogen plasma etching process for tin-based contamination and will provide meaningful guidance for understanding the chemical mechanism of reduction and etching.

关键词： tin-based contamination hydrogen plasma in situ cleaning ion energy

Angular and planar transport properties of antiferromagnetic V5S8

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Chinese physics B 2024年第2期33卷 83-88页

作者：吴晓凯王彬吴德桐陈博文弭孟娟王以林沈冰 Center for Neutron science and technology and School of physics Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devicesand Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University School of Integrated Circuits Shandong Technology Center of Nanodevices and Integration State Key Laboratory of Crystal MaterialsShandong University

Systemically angular and planar transport investigations are performed in layered antiferromagnetic(AF) V5S8. In this AF system, obvious anomalous Hall effect(AHE) is observed with a large Hall angle of 0.1 compared to that in ferromagnetic(FM) system. It can persist to the temperatures above AF transition and exhibit strong angular field *** phase diagram reveals various magnetic states by rotating the applied field. By analyzing the anisotropic transport behavior, magnon contributions are revealed and exhibit obvious angular dependence with a spin-flop vanishing line. The observed prominent planar Hall effect and anisotropic magnetoresisitivity exhibit two-fold systematical angular dependent oscillations. These behaviors are attributed to the scattering from spin–orbital coupling instead of nontrivial topological origin. Our results reveal anisotropic interactions of magnetism and electron in V5S8, suggesting potential opportunities for the AF spintronic sensor and devices.

关键词： antiferromagnetism planar Hall effect magnetic and topological properties

Error field penetration in J-TEXT tokamak based on two-fluid drift-MHD model

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Chinese physics B 2024年第4期33卷 545-551页

作者：王文徐涛张仪 the J-TEXT team State Key laboratory of Advanced Electromagnetic technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

An externally generated resonant magnetic perturbation can induce complex non-ideal MHD responses in their resonant *** have studied the plasma responses using Fitzpatrick's improved two-fluid model and program *** calculated the error field penetration threshold for *** addition,we find that the island width increases slightly as the error field amplitude increases when the error field amplitude is below the critical penetration ***,the island width suddenly jumps to a large value because the shielding effect of the plasma against the error field disappears after the *** scanning the natural mode frequency,we find that the shielding effect of the plasma decreases as the natural mode frequency ***,we obtain the m/n=2/1 penetration threshold scaling on density and temperature.

关键词： plasma responses drift-MHD model error field penetration

Bridging the Fabry–Perot cavity and asymmetric Berreman mode for long-wave infrared nonreciprocal thermal emitters

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science China Technological sciences 2024年第10期67卷 3285-3293页

作者： CHEN ZiHe YU ShiLv HU Run School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan National laboratory for Optoelectronics Huazhong University of Science and Technology Department of Applied physics Kyung Hee University

The long-wave infrared band(8–14 μm) is essential for several applications, such as infrared detection, radiative cooling, and near-field heat transfer. However, according to Kirchhoff's law, the intrinsic balance between thermal absorption and emission limits the further improvement of photon energy conversion and thermal management. Thus, breaking Kirchhoff's balance and achieving nonreciprocal thermal radiation in the long-wave infrared band are necessary. Most existing designs for nonreciprocal thermal emitters rely on grating or photonic crystal structures to achieve nonreciprocal thermal radiation at narrow peaks, which are relatively complex and typically realize bands larger than 14 μm. Here, a sandwich structure consisting of an epsilon-nearzero(ENZ) magneto-optical layer(MOL), a dielectric layer(DL), and a metal layer is proposed to achieve a strong nonreciprocal effect in the long-wave infrared band, which is mainly attributed to the strengthening of the asymmetric Berreman mode by the Fabry–Perot cavity. In addition, the impact of the incident angle, DL thickness, and DL refractive index on the nonreciprocal thermal radiation has been investigated. Moreover, by replacing the ENZ MOL with the gradient ENZ MOL, the existence of the DL can further improve the nonreciprocity of the broadband nonreciprocal thermal radiation. The proposed work promotes the development and application of nonreciprocal energy devices.

关键词： long-wave infrared band nonreciprocal thermal radiation sandwich structure Fabry–Perot cavity asymmetric berreman mode

The combined effects of quantum and strong coupling on the nonlinear collective excitation in quantum dusty plasmas

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Communications in Theoretical physics 2024年第10期76卷 137-142页

作者： Chengkai Li Youyou Kang Yunliang Wang Department of physics School of Mathematics and Physics University of Science and Technology Beijing

The quantum hydrodynamic model for electrons and ions and the generalized hydrodynamic model for the strongly coupled dust particles are proposed in the strongly coupled quantum dusty plasma, where the combined quantum effects of quantum diffraction, quantum statistic pressure,as well as electron exchange and correlation effects are all considered in the quantum hydrodynamic model. The shear and bulk viscosity effects are included in the viscoelastic relaxation, which leads to the decay of the dust-ion-acoustic waves. The approximate time-dependent solitary solution is obtained by the momentum conservation law in the presence of viscosity.

关键词： dusty plasma quantum plasma strongly coupled plasma