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Highly efficient conversion from classical guided waves to topological chiral edge states

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Chinese Optics Letters 2024年第2期22卷 221-226页

作者：韩建飞梁锋赵玉林丁霄汪相如赵德双王秉中 school of {1. University of Electronic Science and Technology of ChinaChengdu 611731China school of Opto{1. Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

Electromagnetic topological chiral edge states mimicking the quantum Hall effect have attracted a great deal of attention due to their unique features of free backscattering and immunity against sharp bends and ***,the matching techniques between classical waveguides and the topological one-way waveguide deserve more attention for real-world *** this paper,a highly efficient conversion structure between a classical rectangular waveguide and a topological one-way waveguide is proposed and demonstrated at the microwave frequency,which efficiently converts classical guided waves to topological one-way edge states.A tapered transition is designed to match both the momentum and impedance of the classical guided waves and the topological one-way edge *** the conversion structure,the waves generated by a point excitation source can be coupled to the topological one-way waveguide with very high coupling efficiency,which can ensure high transmission of the whole system(i.e.,from the source and the receiver).Simulation and measurement results demonstrate the proposed *** investigation is beneficial to the applications of topological one-way waveguides and opens up a new avenue for advanced topological and classical integrated functional devices and systems.

关键词： guided waves highly efficient conversion photonic crystals topological chiral edge states

Masses of the conjectured H-dibaryon at different temperatures

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Chinese physics C 2024年第8期48卷 83-93页

作者： Liang-Kai Wu Han Tang Ning Li Xin-Yang Wang school of {1. and electronic Engineering Jiangsu UniversityZhenjiang 212013China Center for Fundamental physics School of Mechanics and PhysicsAnhui University of Science and TechnologyHuainan 232001China

We present a lattice QCD determination of masses of the conjectured H-dibaryon,denoted as mH,at nine different temperatures:T/T_(c)=0.24,0.63,0.76,0.84,0.95,1.09,1.27,1.52,and *** masses of baryons N,Σ,Ξ,andΛat different temperatures were also *** simulations were performed on an anisotropic lattice with N_(f)=2+1.flavours of clover fermion at a quark mass corresponding to mπ=384(4)*** thermal ensembles were provided by the FASTSUM collaboration,whereas the zero temperature ensembles were provided by the Hadspec *** also calculated the spectral density of the correlation function of those *** spectral density distributions show a rich peak structure at the lowest temperature;at intermediate temperatures,the mass values of those particles obtained by the extrapolation method reflect a two-peak *** the spectral density for the octet baryon becomes smooth at T/T_(c)=1.27,1.52,and 1.90,the spectral density for the H-dibaryon becomes smooth at T/T_(c)=*** T/T_(c)=0.24,the mass difference of the H-dibaryon andΛpair,expressed asΔm=m_(H)−2m_(Λ),was estimated to beΔm=−1..6(6.2)MeV,which suggests the existence of a bound H-dibaryon state.

关键词： lattice QCD H-dibaryon spectral function clover fermion finite temperature

Skyrmion motion induced by spin-waves on magnetic nanotubes

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Chinese physics B 2024年第10期33卷 413-418页

作者： Tijjani Abdulrazak Xuejuan Liu Zhenyu Wang Yunshan Cao Peng Yan school of {1. and State Key Laboratory of electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Department of physics Bayero UniversityKano-700006Nigeria school of Healthcare {1. Chengdu Neusoft UniversityChengdu 611844China

We investigate the skyrmion motion driven by spin waves on magnetic nanotubes through micromagnetic *** key results include demonstrating the stability and enhanced mobility of skyrmions on the edgeless nanotube geometry,which prevents destruction at boundaries—a common issue in planar *** explore the influence of the damping coefficient,amplitude,and frequency of microwaves on skyrmion dynamics,revealing a non-uniform velocity profile characterized by acceleration and deceleration *** results show that the skyrmion Hall effect is significantly modulated on nanotubes compared to planar models,with specific dependencies on the spin-wave *** findings provide insights into skyrmion manipulation for spintronic applications,highlighting the potential for high-speed and efficient information transport in magnonic devices.

关键词： ferromagnetic magnetic nanotube Mumax3 software skyrmion spin-wave

Quantum Anomalous Hall Effect with Tunable Chern Numbers in High-Temperature 1.-PrN_(2) Monolayer

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Chinese physics Letters 2024年第5期41卷 77-84页

作者：吴绪才李树宗司君山黄博张卫兵 Hunan Provincial Key Laboratory of Flexible electronic Materials Genome Engineering School of Physics and Electronic SciencesChangsha University of Science and TechnologyChangsha 410114China

Quantum anomalous Hall(QAH) insulators have highly potential applications in spintronic device. However,available candidates with tunable Chern numbers and high working temperature are quite rare. Here, we predict a 1.-PrN_(2) monolayer as a stable QAH insulator with high magnetic transition temperature of above 600 K and tunable high Chern numbers of C = ±3 from first-principles calculations. Without spin-orbit coupling(SOC),the 1.-PrN_(2) monolayer is predicted to be a p-state Dirac half metal with high Fermi velocity. Rich topological phases depending on magnetization directions can be found when the SOC is considered. The QAH effect with periodical changes of Chern number(±1. can be produced when the magnetic moment breaks all twofold rotational symmetries in the xy plane. The critical state can be identified as Weyl half semimetals. When the magnetization direction is parallel to the z-axis, the system exhibits high Chern number QAH effect with C = ±*** work provides a new material for exploring novel QAH effect and developing high-performance topological devices.

关键词： magnetization topological monolayer

Frequency combs based on magnon-skyrmion interaction in magnetic nanotubes

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Chinese physics B 2024年第8期33卷 505-509页

作者： Tijjani Abdulrazak 刘雪娟金哲珺雨曹云姗严鹏 school of {1. and State Key Laboratory of electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Department of physics Bayero UniversityKano-700006Nigeria school of Healthcare {1. Chengdu Neusoft UniversityChengdu 611844China

Within the magnonics community,there has been a lot of interests in the magnon–skyrmion *** and skyrmions are two intriguing phenomena in condensed matter physics,and magnetic nanotubes have emerged as a suitable platform to study their complex *** show that magnon frequency combs can be induced in magnetic nanotubes by three-wave mixing between the propagating magnons and *** study enriches our fundamental comprehension of magnon–skyrmion interactions and holds promise for developing innovative spintronic devices and *** frequency comb tunability and unique spectral features offer a rich platform for exploring novel avenues in magnetic nano{1..

关键词： ferromagnetic magnetic field magnon Mumax3 software skyrmion

E-MobileNeXt: face expression recognition model based on improved MobileNeXt

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Optoelectronics Letters 2024年第2期20卷 122-128页

作者： ZHANG Xiang YAN Chunman school of {1. and electronic Engineering Northwest Normal UniversityLanzhou 730070China1

In response to the high complexity and low accuracy of current facial expression recognition networks, this paper proposes an E-Mobile Ne Xt network for facial expression recognition. E-Mobile Ne Xt is built based on our proposed E-Sand Glass block. In addition, we also improve the overall performance of the network through Rep Conv and SGE attention mechanisms. The experimental results show that the network model improves the expression recognition accuracy by 6.5% and 7.1.% in RAF-DB and CK+ datasets, respectively, while the parameter and floating-point operations decreased by 0.79 M and 4.2 M compared with Mobile Ne Xt.

关键词： facial mechanisms. network

Shape-influenced non-reciprocal transport of magnetic skyrmions in nanoscale channel

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Chinese physics B 2024年第7期33卷 605-611页

作者：陈杰尧罗佳胡更新王君林李冠祺陈振东陆显扬赵国平刘远吴竞徐永兵 school of Integrated Circuits Guangdong University of TechnologyGuangzhou 510006China school of {1. Engineering and TechnologyUniversity of YorkYork YO105DDUnited Kingdom College of physics and {1. Engineering Sichuan Normal UniversityChengdu 610068China Jiangsu Provincial Key Laboratory of Advanced Photonic and electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.

关键词： skyrmion micromagnetic simulation racetrack memory

Optimal and robust control of population transfer in asymmetric quantum-dot molecules

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Chinese physics B 2024年第2期33卷 353-359页

作者：郭裕马松山束传存 Hunan Provincial Key Laboratory of Flexible electronic Materials Genome Engineering School of Physics and Electronic ScienceChangsha University of Science and TechnologyChangsha 410114China Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083China

We present an optimal and robust quantum control method for efficient population transfer in asymmetric double quantum-dot *** derive a long-duration control scheme that allows for highly efficient population transfer by accurately controlling the amplitude of a narrow-bandwidth *** overcome fluctuations in control field parameters,we employ a frequency-domain quantum optimal control theory method to optimize the spectral phase of a single pulse with broad bandwidth while preserving the spectral *** is shown that this spectral-phase-only optimization approach can successfully identify robust and optimal control fields,leading to efficient population transfer to the target state while concurrently suppressing population transfer to undesired *** method demonstrates resilience to fluctuations in control field parameters,making it a promising approach for reliable and efficient population transfer in practical applications.

关键词： population transfer quantum optimal control theory quantum-dot molecules

Autofocus by Lissajous scanning in time reversal optical scanning holography

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Chinese Optics Letters 2024年第8期22卷 13-20页

作者： Jie Liu Haiyan Ou Hua Wang Lin Peng Wei Shao Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000China school of {1. University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic TechnologyGuilin 541004China

In this Letter, an autofocusing method in optical scanning holography(OSH) system is proposed. By introducing Lissajous scanning into multiple signal classification(MUSIC) method in time-reversal(TR) OSH, the axial locations of the targets can be retrieved with better resolution and the peak prominence increases from 0.21.to 0.34. The feasibility of this method is confirmed by simulation as well as experiment.

关键词： digital holography Lissajous scanning image reconstruction axial localization