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magnetically controllable multimode interference in topological photonic crystals

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Light(Science & Applications) 2024年第5期13卷 998-1005页

作者： Weiyuan Tang Mudi Wang shaojie ma Che Ting Chan Shuang Zhang New Cornerstone Science Laboratory Department of PhysicsThe University of Hong KongHong KongChina. Department of Physics The Hong Kong University of Science and TechnologyHong KongChina. Department of Optical Science and Engineering Fudan UniversityShanghai 200433China

Topological photonic insulators show promise for applications in compact integrated photonic circuits due to their ability to transport light robustly through sharp *** number of topological edge states relies on the difference between the bulk Chern numbers across the boundary,as dictated by the bulk edge *** interference among multiple topological edge modes in topological photonics systems may allow for controllable functionalities that are particularly desirable for constructing reconfigurable photonic *** this work,we demonstrate magnetically controllable multimode interference based on gyromagnetic topological photonic insulators that support two unidirectional edge modes with different *** successfully achieve controllable power splitting in experiments by engineering multimode interference with the magnetic field intensity or the frequency of *** work demonstrates that manipulating the interference among multiple chiral edge modes can facilitate the advancement of highly efficient and adaptable microwave devices.

关键词： multimode controllable microwave

Experimental realization of chiral Landau levels in two-dimensional Dirac cone systems with inhomogeneous effective mass

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Light(Science & Applications) 2023年第8期12卷 1616-1622页

作者： Hongwei Jia Mudi Wang shaojie ma Ruo-Yang Zhang Jing Hu Dongyang Wang Che Ting Chan Department of Physics the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Institute for Advanced Study the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Physics University of Hong KongHong KongChina

Chiral zeroth Landau levels are topologically protected bulk *** particle physics and condensed matter physics,the chiral zeroth Landau level plays a significant role in breaking chiral symmetry and gives rise to the chiral *** experimental works on such chiral Landau levels are mainly based on three-dimensional Weyl degeneracies coupled with axial magnetic *** realizations using two-dimensional Dirac point systems,being more promising for future applications,were never experimentally realized *** we propose an experimental scheme for realizing chiral Landau levels in a two-dimensional photonic *** introducing an inhomogeneous effective mass through breaking local parity-inversion symmetries,a synthetic in-plane magnetic field is generated and coupled with the Dirac ***,the zeroth-order chiral Landau levels can be induced,and the one-way propagation characteristics are experimentally *** addition,the robust transport of the chiral zeroth mode against defects in the system is also experimentally *** system provides a new pathway for the realization of chiral Landau levels in two-dimensional Dirac cone systems,and may potentially be applied in device designs utilizing the chiral response and transport robustness.

关键词： chiral Landau realization

Octupole corner state in a three-dimensional topological circuit

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Light(Science & Applications) 2020年第1期9卷 618-626页

作者： Shuo Liu shaojie ma Qian Zhang Lei Zhang Cheng Yang Oubo You Wenlong Gao Yuanjiang Xiang Tie Jun Cui Shuang Zhang Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen University518060 ShenzhenChina School of Physics and Astronomy University of BirminghamBirmingham B152TTUK State Key Laboratory of Millimeter Waves Southeast University210096 NanjingChina School of Physics and Electronics Hunan University410082 ChangshaChina

Higher-order topological insulators(HOTIs)represent a new family of topological materials featuring quantized bulk polarizations and zero-dimensional corner *** recent years,zero-dimensional corner states have been demonstrated in two-dimensional systems in the form of quadrupole modes or dipole *** to the challenges in designing and constructing three-dimensional systems,octupole corner modes in 3D have not been *** this work,we experimentally investigate octupole topological phases in a three-dimensional electrical circuit,which can be viewed as a cubic lattice version of the Hofstadter model with aπ-flux threading each *** experimentally observe in our higher-order topological circuit a 0D corner state manifested as a localized impedance *** observed corner state in the electrical circuit is induced by the octupole moment of the bulk circuit and is topologically protected by anticommuting spatial symmetries of the circuit *** work provides a platform for investigating higher-order topological effects in three-dimensional electrical circuits.

关键词： topological state electrical

Non-Hermitian Skin Effect in a Non-Hermitian Electrical Circuit

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Research 2021年第1期2021卷 277-285页

作者： Shuo Liu Ruiwen Shao shaojie ma Lei Zhang Oubo You Haotian Wu Yuan Jiang Xiang Tie Jun Cui Shuang Zhang School of Physics and Astronomy University of BirminghamBirmingham B152TTUK State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China School of Physics and Electronics Hunan UniversityChangsha 410082China

The conventional bulk-boundary correspondence directly connects the number of topological edge states in a finite system with the topological invariant in the bulk band structure with periodic boundary condition(PBC).However,recent studies show that this principle fails in certain non-Hermitian systems with broken reciprocity,which stems from the non-Hermitian skin effect(NHSE)in the finite system where most of the eigenstates decay exponentially from the system *** this work,we experimentally demonstrate a 1D non-Hermitian topological circuit with broken reciprocity by utilizing the unidirectional coupling feature of the voltage follower *** topological edge state is observed at the boundary of an open circuit through an impedance spectra measurement between adjacent circuit *** confirm the inapplicability of the conventional bulk-boundary correspondence by comparing the circuit Laplacian between the periodic boundary condition(PBC)and open boundary condition(OBC).Instead,a recently proposed non-Bloch bulk-boundary condition based on a non-Bloch winding number faithfully predicts the number of topological edge states.

关键词： topological boundary system

LA-D-B1,a novel Abemaciclib derivative,exerts anti-breast cancer effects through CDK4/6

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BIOCELL 2024年第5期48卷 847-860页

作者： LING ma ZIRUI JIANG XIAO HOU YUTING XU ZIYUN CHEN SIYI ZHANG HANXUE LI shaojie ma GENG ZHANG XIUJUN WANG JING JI Jiangsu Key Laboratory of marine Pharmaceutical Compound Screening College of PharmacyJiangsu Ocean UniversityLianyungang222000China School of Medicine Xiamen UniversityXiamen361102China

Background:Regulatory proteins involved in human cellular division and proliferation,cyclin-dependent kinases 4 and 6(CDK4/6)are overexpressed in numerous cancers,including triple-negative breast cancer(TNBC).TNBC is a common pathological subtype of breast cancer that is prone to recurrence and metastasis,and has a single treatment *** one of the CDK4/6 inhibitors,abemaciclib can effectively inhibit the growth of breast *** this study,we synthesized LA-D-B1,a derivative of Abemaciclib,and investigated its anti-tumor effects in breast ***:Cellular viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)*** cloning and migration abilities were determined by colony formation assay and wound healing *** invasion abilities and adhesion were determined by cell invasion assay and cell adhesion *** impact of compound LA-D-B1 on cell proliferation and the cell cycle was analyzed through Western blotting,which quantified the levels of proteins associated with the cyclin-dependent kinase(CDK)4/6-cyclin D-Rb-E2F *** in vivo anti-tumor activity of compound LA-D-B1 was investigated using a chick chorioallantoic membrane(CAM)***:The study demonstrated that LA-D-B1 effectively suppressed breast cancer cell proliferation,induced apoptosis,and caused cell cycle ***,LA-D-B1 reduced the expression of key proteins in the CDK4/6-cyclin D-Rb-E2F pathway,including CDK4,CDK6 and *** results also indicated significant antitumor activity of LA-D-B1 in a transplanted tumor ***:In this study,LA-D-B1 demonstrated a potent anti-tumor effect by effectively suppressing cell proliferation and inhibiting cell cycle progression in breast *** findings highlight the potential of LA-D-B1 as a valuable compound for enhancing therapeutic outcomes and controlling the progression of breast cancer.

关键词： CDK4/6 inhibitor Breast cancer Antitumor activity Cell cycle

Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit

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Research 2019年第1期2019卷 1165-1172页

作者： Shuo Liu Wenlong Gao Qian Zhang shaojie ma Lei Zhang Changxu Liu Yuan Jiang Xiang Tie Jun Cui Shuang Zhang School of Physics and Astronomy University of BirminghamBirmingham B152TTUK Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

Topological circuits,an exciting feld just emerged over the last two years,have become a very accessible platform for realizing and exploring topological physics,with many of their physical phenomena and potential applications as yet to be *** this work,we design and experimentally demonstrate a topologically nontrivial band structure and the associated topologically protected edge states in an RF circuit,which is composed of a collection of grounded capacitors connected by alternating inductors in the x and y directions,in analogy to the Su–Schriefer–Heeger *** take full control of the topological invariant(i.e.,Zak phase)as well as the gap width of the band structure by simply tuning the circuit *** agreement is found between the experimental and simulation results,both showing obvious nontrivial edge state that is tightly bound to the circuit boundaries with extreme robustness against various types of *** demonstration of topological properties in circuits provides a convenient and fexible platform for studying topological materials and the possibility for developing fexible circuits with highly robust circuit performance.

关键词： topological nontrivial analogy

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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin ma shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

颗粒自激式冲击-振动耦合力学试验方法及试验研究

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振动与冲击 2023年第3期42卷 227-234页

作者：李飞胤马少杰张合南京理工大学机械工程学院南京210094

针对一类冲击-振动耦合力学试验的技术需求,提出了一种短间隔连续冲击及颗粒体自激振动复合的冲击-振动耦合力学试验方法,并研制了试验系统样机。基于EDEM软件和VC++二次开发建立了试验系统自激振动结构的离散元耦合仿真模型,分析了颗... 详细信息

针对一类冲击-振动耦合力学试验的技术需求,提出了一种短间隔连续冲击及颗粒体自激振动复合的冲击-振动耦合力学试验方法,并研制了试验系统样机。基于EDEM软件和VC++二次开发建立了试验系统自激振动结构的离散元耦合仿真模型,分析了颗粒体自激振动响应的一般规律,在此基础上根据应用需求优化选择自激振动加载方案。基于研制的力学试验系统样机和自激振动方案开展试验研究,通过分析对比连续冲击加载和冲击-振动耦合加载响应加速度时频域信号,验证了选择的颗粒体自激振动加载方案的实际作用效果,该试验系统可满足一些苛刻高动态连续冲击试验和连续冲击-多频振动耦合试验的需求,研究具有较好的科学意义和工程应用价值。

关键词：冲击-振动耦合自激振动离散元耦合力学试验

Numerical Simulation Research on Stress Change of Floor under High Confined Water

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Numerical Simulation Research on Stress Change of Floor unde...