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Controlled propagation and particle manipulation of off-axis-rotating elliptical Gaussian beams in strong nonlocal media

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Chinese physics B 2025年第3期34卷 415-422页

作者： Rong-Quan Chen Rui-Lin Xiao Wei Wang Xi-Xi Chu Yu-Qing Song Xu-Dong Hu Ming Chen Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China School of Physics Anshan Normal UniversityAnshan 114007China

Off-axis-rotating elliptical Gaussian beams(Oare GB)oblique incidence in strong nonlocal medium exhibit novel propagation *** analytical expressions of semi-axial beam widths,and center-of-mass trajectory equations for transmitting off-axis-rotating elliptical Gaussian beams in strong nonlocal media are obtained using the ABCD transfer matrix *** study revealed that the trajectory of the mass's center in the cross-section can be controlled by changing the sizes of the Oare GB parameters c,d,ζ,and *** gradient force of the light field causes the spot region to form a spatial potential well in the media,and this spatial potential well can effectively capture *** particles captured by the light field can move along with the beam,realizing the effective manipulation of the particle *** laws may be applied to modulating the propagation path of light beams and optical tweezer technology.

关键词： nonlinear optics off-axis-rotating elliptical Gaussian beam orbital angular momentum

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Perfect Confinement of Acoustic Vortex by Phase-Gradient Metacage

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Chinese physics Letters 2025年第3期42卷 80-84页

作者： Xicheng Fang Songsong Li Baoyin Sun Dongyang Yan Junyi Yang Jie Luo Dongliang Gao Yadong Xu School of Physical Science and Technology&Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow UniversitySuzhou 215006China

Acoustic wave isolation and noise reduction are significant challenges in the fields of physics and various *** noise-control devices are often hampered by substantial size limitations,and their operational efficacy is generally restricted to planar *** this study,we demonstrate perfect confinement of acoustic vortex waves using an acoustic metacage consisting of phase-gradient *** leveraging the parity-reversed diffraction rule of phase-gradient metasurfaces,the designed metacage exhibited remarkable capabilities for the perfect confinement of acoustic vortex waves,showing robust performance even in the presence of source *** findings present a promising strategy for developing precise and adaptable acoustic confinement technologies.

关键词： Acoustic perfect vortex

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Einstein-de Haas effect:a bridge linking mechanics,magnetism,and topology

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Science Bulletin 2025年第3期70卷 301-304页

作者： Xin Nie Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The Einstein-de Haas(EdH)effect,which establishes that changes in magnetization induce mechanical rotation,was experimentally demonstrated in 1915[1],independently of Richardson’s[2]earlier conceptual prediction rela... 详细信息

关键词： effect linking topology

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Precise Control of Charge States in Single Quantum Dots Using Bipolar Junction Transistors

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ACS Photonics 2025年第5期12卷 2695-2700页

作者： Song, Changkun Yang, Jiawei Chen, Yingxin Yu, Ying Yu, Siyuan State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology School of Physics Sun Yat-Sen University Guangzhou510006 China

We introduce a novel method for precise control of quantum dot (QD) charge states using a bipolar junction transistor (BJT). By adjusting the base-emitter and collector-base voltages, we can switch the QD between different charge states, offering fine-tuned control over its emission properties. The QD’s charge environment, regulated by the collector current, enables precise manipulation of its optical characteristics. Experimental results demonstrate that the charged states exhibit narrow linewidths and high single-photon purity. This transistor-based approach not only facilitates the miniaturization and integration of QD devices but also provides a powerful platform for controlling spin-photon interactions, with significant potential for applications in quantum computing and networks. © 2025 American Chemical Society.

关键词： Qubits

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Enhanced N_(2)electroreduction activity of single-atom catalysts:Modulating the linear scaling relationship by coordination engineering and dual-site strategies

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Nano Research 2025年第3期18卷 696-709页

作者： Renyi Li Caimu Wang Jiao Zhang Wei Guo Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Frontiers Science Center for High Energy Material(MOE) Beijing Institute of TechnologyBeijing 100081China

The volcano plot is widely used to elucidate the activity trends among different catalysts,thereby effectively screening and guiding catalyst ***,the inherent linear scaling relationship(LSR)constrains the breakthrough in the activity of catalysts,and the understanding of the activity limit in volcano plot is still *** this work,by employing first-principles calculations and microkinetic modeling,we proposed coordination engineering(CE)and dual-site(DS)strategies to surpass the Sabatier’s limitation of WS_(2)-supported TM(TM@WS_(2))single-atom catalysts(SACs)for electrocatalytic nitrogen reduction reaction(eNRR).We found that the LSR betweenΔG(^(*)N_(2)→^(*)N_(2)H)andΔG(^(*)NH_(2)→^(*)NH_(3))was optimized to be closer to the ideal space of eNRR activity after modulating TM@WS_(2)SACs by these two design *** combining the reaction selectivity trend plot,we picked out N-Os@WS_(2),C-Ir@WS_(2),Fe_(2)@WS_(2),and Ru_(2)@WS_(2)as optimal eNRR catalysts with low limiting potential(UL),and N-Os@WS_(2)SAC(UL:-0.28 V)outperforms the best eNRR catalyst among TM@WS_(2)*** constructing explicit solvent models,we conducted a detailed study on the reaction kinetics of proton transfer over these four *** propose that the activity enhancement in TM@WS_(2)SACs for eNRR can be attributed to the ligand effect and geometric effect brought about by CE and DS strategies,improving the donation-backdonation process of electron transfer between N_(2)and the active *** designed catalyst has certain resistance to demetallization and agglomeration under simulated solvent *** work provides a feasible design strategy for the activity enhancement of SACs and brings a new perspective to deeply understanding the volcano plot in heterogeneous catalysis.

关键词： linear scaling relationship volcano plot single-atom catalysts density functional theory(DFT) electrochemical nitrogen reduction

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Characteristics of radio-frequency magnetron sputtering with Ag target operated near the electron series resonance oscillation

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Plasma Science and technology 2025年第3期27卷 111-117页

作者： Chao YE School of Physics Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and DevicesSoochow UniversitySuzhou 215006People’s Republic of China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123People’s Republic of China

The discharge and plasma characteristics of Ag magnetron sputtering discharge operated near the electron series resonance(ESR)oscillation,which was excited using the driving frequency of 27.12 MHz,was *** imaginary part of impedance was found to undergo a transition from capacitive to inductive on varying radio-frequency(RF)power,and the conditions for the ESR excitation were *** current–voltage(I–V)characteristic of discharge showed that the lower discharge voltage with higher current was an important feature of RF magnetron sputtering operated near the ESR oscillation,which was caused by the small impedance Z originated from the mutual compensation between the sheath capacitive reactance and the plasma inductive *** higher electron temperature,ion flux density and ion energy as well as the moderate electron density were *** interaction of higher energy ions on substrate surface improved the crystallographic quality of Ag ***,the 27.12 MHz magnetron sputtering operated near the ESR oscillation has better deposition characteristics than that of commercial 13.56 MHz RF magnetron sputtering.

关键词： electron series resonance magnetron sputtering radio-frequency discharge

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Adjusting frequency response characteristics of fiber optic accelerometers using electromagnetic feedback technology

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Optics Express 2025年第9期33卷 19235-19246页

作者： An, Ran Ping, Xinyang Yang, Jun Yuan, Yonggui Wen, Kunhua Wang, Shun Wang, Yuncai Qin, Yuwen Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou51006 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of China Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou510006 China School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou510006 China

A control method of electromagnetic feedback is proposed for adjusting frequency response characteristics of fiber optic accelerometers, which could expand the flat working bandwidth and enhance performance consistency. The proof sensor employs an open-loop disc-type vibration pickup structure, cascaded with an electromagnetic feedback control unit. A proportional-differential control algorithm is utilized to generate the feedback signal, which ultimately acts on the input side of the sensor. Experimental results show that the 3 dB bandwidth of the constructed closed-loop system is expanded to approximately 210 Hz, more than 3.5 times that of the open-loop system, while maintaining a sensitivity of 72.97 dB re rad/g. Furthermore, the regulated closed-loop systems exhibit a significantly reduced response deviation, compared to the open-loop systems with fluctuating response characteristics due to fabrication errors. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Accelerometers

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Catalytic production of high-energy-density spiro polycyclic jet fuel with biomass derivatives

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Journal of Energy Chemistry 2025年第2期101卷 760-768,I0016页

作者： Wen-Jing Zhang Yan-Cheng Hu Yan-Hong Tan Jia Li Ning Li Jing-Pei Cao School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116JiangsuChina CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

High-energy-density(HED)fuel(*** used JP-10 and RJ-4),featuring compact 3D polycyclic structure with high strain,is of critical importance for volume-limited military aircraft,since their high density and combustion heat can provide more propulsion *** reduce the reliance on petroleum source,it is highly desirable to develop renewable alternatives for the production of strained polycyclic HED fuel,but which remains a big challenge because of the inaccessibility caused by the high strain,We herein demonstrate a three-step catalytic route towards highly strained C_(17)and C_(18)spirofuel with biomass *** process includes catalytic aldol condensation of renewable cyclohexanone/cyclopentanone with benzaldehyde,catalytic spiro Diels-Alder(D-A)reaction of aldol adduct with isoprene,and catalytic *** key spiro D-A reaction is enabled by the catalysis of heterogeneous Lewis acidic ionic *** chloroaluminate IL,formed by benign urea and AICl3,exhibits good catalytic performance and reusability for this *** eventual hydrodeoxygenation(HDO)over Pd/C and H-Y produces strained tricyclic spirofuel with density>0.93 g/mL,combustion heat>41 MJ/L and freezing point<-40℃,which are better than the properties of tactical fuel ***,it is anticipated that the as-prepared renewable fuels have the potential to replace traditional petroleum-derived HED fuels.

关键词： Biomass derivatives High-energy-density Spiro polycyclic fuel Cycloaddition Lewis acidic ionic liquid

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Modulation of the octahedral structure and potential superconductivity of La_(3)Ni_(2)O_(7)through strain engineering

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 145-152页

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods&Software of Ministry of Education State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of PhysicsSun Yat-sen UniversityGuangzhou510275China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an710049China Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo315211China

The recent transport measurements of La_(3)Ni_(2)O_(7)uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature(P-T)phase *** by this,we perform theoretical first-principles studies of La_(3)Ni_(2)O_(7)with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d_(z^(2))electron density at the Fermi energy(n_(z)^(E_(F)))that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of n_(z)^(E_(F)),we propose that superconductivity can be achieved by applying only ~2GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nz E Fand the superconducting T_(c)in La_(3)Ni_(2)O_(7)*** study provides new routes to the search of high-T_(c)superconductors in future experiments.

关键词： nickelate superconductors density functional theory strong correlated systems strain engineering

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Shaping attosecond pulses via high-order harmonic generation driven by two mixed Laguerre-Gaussian vortex beams

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Optics Express 2025年第8期33卷 18540-18555页

作者： Wang, Beiyu Yin, Zhiming Wu, Shengfei Li, Baochang Han, Jiaxin Yang, Zengqiang Jin, Cheng Department of Applied Physics Nanjing University of Science and Technology Jiangsu Nanjing210094 China School of Physics and Information Science Shaanxi University of Science and Technology Shaanxi Xi’An710021 China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Engineering Research Center of Semiconductor Device Optoelectronic Hybrid Integration in Jiangsu Province Nanjing University of Science and Technology Jiangsu Nanjing210094 China

Shaping the waveform of attosecond pulses is crucial for controlling electron dynamics and is typically achieved using a high-order harmonic generation (HHG) spectrum containing a minimum. Here, we propose a novel method for shaping attosecond pulses via HHG without carrying orbital angular momentum (OAM), driven by two mixed Laguerre-Gaussian vortex beams with oppositely signed OAMs. We show that the waveform of an attosecond pulse train synthesized using low-divergent, non-vortical high harmonics in the far field can be significantly regulated;specifically, the number of emission bursts within half an optical cycle of the driving laser increases to five compared to one or two bursts in the previous studies. We also show that the spectral structure of on-axis high harmonics in the far field, as well as the waveform of the resulting attosecond pulses, can be modified by varying the position or thickness of the gas medium. Additionally, we analyze the phase-matching mechanism of near-field harmonics, which generate on-axis harmonics in the far field after propagation. Transverse and longitudinal phase-matching mechanisms are identified for thin and thick gas media, respectively. We anticipate that this work will provide new insights into expanding the applications of employing vortex beams to drive the HHG process in gas media. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Vortex flow

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