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Two-Dimensional Gap Solitons in Parity-Time Symmetry Moiré Optical Lattices with Rydberg–Rydberg Interaction

Chinese physics Letters 2023年第4期40卷 28-33页

作者：黎斌斌赵元徐四六周勤傅其栋叶芳伟花春波陈懋薇胡恒洁周倩倩邱章才 School of Biomedical Engineering and Medical Imaging Xianning Medical CollegeHubei University of Science and TechnologyXianning 437100China Laboratory of Optoelectronic Information and Intelligent Control Hubei University of Science and TechnologyXianning 437100China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China

Realizing single light solitons that are stable in high dimensions is a long-standing goal in research of nonlinear optical ***,we address a scheme to generate stable two-dimensional solitons in a cold Rydberg atomic system with a parity-time(PT) symmetric moiré optical *** uncover the formation,properties,and their dynamics of fundamental and two-pole gap solitons as well as vortical *** PT symmetry,lattice strength,and the degrees of local and nonlocal nonlinearity are tunable and can be used to control *** stability regions of these solitons are evaluated in two numerical ways:linear-stability analysis and time evolutions with *** results provide an insightful understanding of solitons physics in combined versatile platforms of PT-symmetric systems and Rydberg–Rydberg interaction in cold gases.

关键词： Rydberg solitons symmetric

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Ultralow-Temperature Heat Transport Evidence for Residual Density of States in the Superconducting State of CsV_(3)Sb_(5 )

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Chinese physics Letters 2024年第12期41卷 141-148页

作者： C.C.Zhao L.S.Wang W.Xia Q.W.Yin H.B.Deng G.W.Liu J.J.Liu X.Zhang J.M.Ni Y.Y.Huang C.P.Tu Z.C.Tao Z.J.Tu C.S.Gong Z.W.Wang H.C.Lei Y.F.Guo X.F.Yang J.X.Yin S.Y.Li State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200438China Shanghai Research Center for Quantum Sciences Shanghai 201315China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics Shanghai 201210China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Center for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Shanghai Branch Hefei National LaboratoryShanghai 201315China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),CDW,frustration,and ***,we report ultralow-temperature thermal conductivity measurements of CsV_(3)Sb_(5 ) and Ta-doped Cs((V_(0.86)Ta_(0.14)))_(3)Sb_(5) and scanning tunneling microscopy(STM)measurements of CsV_(3)Sb_(5 ).The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV_(3)Sb_(5 ).This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 ***,in Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),which does not have CDW order,there is no evidence for the residual *** results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV_(3)Sb_(5 ).

关键词： thereby conductivity

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High-performance chiral all-optical OR logic gate based on topological edge states of valley photonic crystal

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Chinese physics B 2023年第7期32卷 392-398页

作者：王晓蓉费宏明林瀚武敏康丽娟张明达刘欣杨毅彪肖连团 College of Physics Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China School of Science RMIT UniversityMelbourneVictoria 3000Australia

For all-optical communication and information processing,it is necessary to develop all-optical logic gates based on photonic structures that can directly perform logic ***-optical logic gates have been demonstrated based on conventional waveguides and interferometry,as well as photonic crystal ***,any defects in those structures will introduce high scattering loss,which compromises the fidelity and contrast ratio of the information *** on the spin-valley locking effect that can achieve defect-immune unidirectional transmission of topological edge states in valley photonic crystals(VPCs),we propose a high-performance all-optical logic OR gate based on a VPC *** tuning the working bandwidth of the two input channels,we prevent interference between the two channels to achieve a stable and high-fidelity *** transmittance of both channels is higher than 0.8,and a high contrast ratio of 28.8 dB is ***,the chirality of the logic gate originated from the spin-valley locking effect allows using different circularly polarized light as inputs,representing“1”or“0”,which is highly desired in quantum *** device’s footprint is 18μm×12μm,allowing high-density on-chip *** addition,this design can be experimentally fabricated using current nanofabrication techniques and will have potential applications in optical communication,information processing,and quantum computing.

关键词： topological photonics topological edge state valley photonic crystal all-optical logic gate

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Synthesis of fluorescent multisubstituted polyquinolines by cascade C–H activation-based polyannulations of isonicotinamides and diynes

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science China Chemistry 2023年第4期66卷 1139-1149页

作者： Dongyang Fan Fei Zhang Jie Cui Dong Wang Ting Han Ben Zhong Tang Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen 518172China

The development of new and efficient polymerization strategies for the synthesis of multisubstituted fused heterocyclic polymers with attractive properties is of great ***,a rhodium-catalyzed polyannulation route is developed for the in situ generation of multisubstituted polyquinolines with efficient aggregate-state *** on the cascade C-H activation of isonicotinamides and their annulations with internal diynes,a series of high molecular weight polyquinolines are efficiently produced in high yields of up to 99%in a facile and atom-economical *** conventional two-component stepwise polymerizations,these polyannulation reactions are tolerant to monomer non-stoichiometric conditions and proceed even more thoroughly in the presence of an excess amount of the isonicotinamide *** from the unique multisubstituted polyquinoline structures,the obtained polymers show high thermal and morphological stability,useful aggregation-induced emission(AIE)properties,and tunable aggregated-state fluorescence *** AIE-active polyquinoline is demonstrated to be a good lysosome-specific fluorescent probe with low cytotoxicity and excellent photostability.

关键词： fused heterocyclic polymers polyannulation polyquinolines aggregation-induced emission bioimaging

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Theoretical study of superradiant masing with solid-state spins at room temperature

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science China(physics,Mechanics & Astronomy) 2024年第6期67卷 38-47页

作者： Qilong Wu Yuan Zhang Hao Wu Shi-Lei Su Kai-Kai Liu Mark Oxborrow Chong-Xin Shan Klaus Mølmer Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academy of Quantum Information Sciences Beijing 100193China Department of Materials Imperial College LondonLondon SW72AZUK Niels Bohr Institute University of CopenhagenCopenhagen 2100Denmark

Steady-state superradiance and superradiant lasing attract significant attentions in the field of optical lattice clocks,but have not been achieved yet due to the technical challenges and atom loss *** this article,we propose that their counter-part may be observed in the microwave domain with solid-state spins,i.e.,nitrogen-vacancy center spins and pentacene molecular spins,coupled to microwave resonator at room temperature with realistic technical *** validate our proposal,we investigate systematically the system dynamics and steady-state by solving quantum master equations for the multi-level and multi-process dynamics of trillions of *** calculations show that the superradiant Rabi oscillations occur firstly due to transitions among different Dicke states,and the subsequent continuous-wave superradiant masing can achieve a linewidth well below *** work may guide further exploration of transient and steady-state superradiant masing with the mentioned and other solid-state spins *** ultra-narrow linewidth may find applications in deep-space communications,radio astronomy and high-precision metrology.

关键词： solid-state spins superradiance maser

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A New Chirality Invertible Photoswitch:Light-Driven Axially Chiral Hydrazone Enabling Dynamic Handedness Inversion of Self-Organized Helical Superstructure

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CCS Chemistry 2024年第8期6卷 2011-2020页

作者： Ruochen Lan Jinying Bao Zhaozhong Li Zizheng Wang Zichen Wang Qian Wang Lanying Zhang Jiumei Xiao Huai Yang Institute of Advanced Materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022 Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringPeking UniversityBeijing 100871 School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083 Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083 Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking UniversityBeijing 100871 School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083

Inspired by nature,dynamic self-organized helical superstructures are becoming attractive as building blocks in soft photonic crystals and advanced chiroptical ***,a chirality invertible hydrazone photoswitch,possessing high helical twisting power(HTP)was judiciously designed and *** to the photoinduced configuration changes of the hydrazone photoswitch,it displayed superior thermal stability and strikingly reversible HTP *** incorporating a novel chiral hydrazone(CH)into the liquid crystal(LC)host,a handedness invertible cholesteric liquid crystal(CLC)helical superstructure with high thermal stability and light-modulated photonic bandgap was *** inferred that the mechanism of chirality inversion of the novel CH photoswitch derived from changes in the dihedral angle between the two naphthalene rings induced by hydrazone ***,the influence of chemical structures on its photoresponsiveness was ***,the potential applications of this advanced light-driven CLC in soft photonic crystals,showing erasable and rewritable colorful patterns and chiroptical templates to induce handedness invertible circularly polarized luminescence were illustrated.

关键词： chirality inversion hydrazone photoswitch cholesteric liquid crystals dynamic photonic crystals dynamic circularly polarized luminescence

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Disordered Landau levels of single-cone massless Dirac fermions with broken particle-hole symmetry

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Physical Review B 2024年第9期110卷 094202页

作者： Shu-feng Zhang Yong-liang Song Wei-jiang Gong Chui-zhen Chen School of Physics and Technology College of Sciences Institute for Advanced Study and School of Physical Science and Technology

Recently, a single two-dimensional gapless Dirac cone has been experimentally observed on the surface of a semimagnetic topological insulator, providing a platform to study the physics of a single Dirac fermion. Here, we focus on Landau levels (LLs) in the presence of Anderson disorder. We find that the particle-hole (PH) asymmetric term is essential for determining the evolution of LLs with magnetic flux and disorder. With particle-hole symmetry (PHS), the zeroth LL E0 is pinned at the charge-neutrality point and independent of magnetic field and weak disorder. However, with PHS broken, E0 either ascends or descends depending on the sign of the PH asymmetric term. Furthermore, neighboring LLs En≠0 adhere to the antilevitation scenario for a vanishing or small PH asymmetric term. In contrast, for a sufficiently large PH asymmetric term, LLs above and below E0 exhibit different behaviors. We also propose a theoretical method to understand these evolutionary behaviors of disordered LLs based on self-consistent Born approximation. Finally, we find that a rare-region-like effect occurs for a small disorder concentration, leading to rich scenarios. In particular, the zeroth LL E0 becomes dependent on magnetic flux, and its dependence on disorder strength becomes nonmonotonic. Our findings offer valuable insights for understanding disordered LLs of Dirac fermions and provide guidance for experiments involving topological insulators in strong magnetic fields.

关键词： Anderson localization Landau levels Topological insulators Transfer matrix method

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Literature classification and its applications in condensed matter physics and materials science by natural language processing

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Chinese physics B 2024年第5期33卷 117-123页

作者：吴思远朱天念涂思佳肖睿娟袁洁吴泉生李泓翁红明 Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Condensed Matter Physics Data Center of Chinese Academy of Sciences Beijing 100190China

The exponential growth of literature is constraining researchers’access to comprehensive information in related *** natural language processing(NLP)may offer an effective solution to literature classification,it remains hindered by the lack of labelled *** this article,we introduce a novel method for generating literature classification models through semi-supervised learning,which can generate labelled dataset iteratively with limited human *** apply this method to train NLP models for classifying literatures related to several research directions,i.e.,battery,superconductor,topological material,and artificial intelligence(AI)in materials *** trained NLP‘battery’model applied on a larger dataset different from the training and testing dataset can achieve F1 score of 0.738,which indicates the accuracy and reliability of this ***,our approach demonstrates that even with insufficient data,the not-well-trained model in the first few cycles can identify the relationships among different research fields and facilitate the discovery and understanding of interdisciplinary directions.

关键词： natural language processing text mining materials science

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介孔氧化镁中碳量子点三重态的产生及其磷光和光催化特性

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science China Materials 2024年第1期67卷 170-178页

作者：姚清吴浩怡梁锦基王传龙金亚洪胡义华唐友宏 School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou 510006China Institute for NanoScale Science and Technology College of Science and EngineeringFlinders UniversitySouth Australia 5042Australia

本文通过高温热解柠檬酸(CA)和Mg_(2)(OH)_(2)CO_(3)的混合物将碳量子点嵌入到介孔MgO中,并观察到室温磷光.碳量子点通过含氧官能团与MgO连接并被限制于MgO介孔中.由于碳量子点表面原子自动受限,其电子自旋角动量将改变,产生自旋三重态... 详细信息

本文通过高温热解柠檬酸(CA)和Mg_(2)(OH)_(2)CO_(3)的混合物将碳量子点嵌入到介孔MgO中,并观察到室温磷光.碳量子点通过含氧官能团与MgO连接并被限制于MgO介孔中.由于碳量子点表面原子自动受限,其电子自旋角动量将改变,产生自旋三重态并可获得磷光.碳量子点与MgO的杂化复合物表现出典型的激发依赖现象,当激发波长增加时,荧光和室温磷光产生明显的红移,因此具有良好的防伪应用价值.CA在MgO中热解,使碳量子点与MgO的杂化复合物具有较高的比表面积和较宽的吸收波长.碳量子点的三重态电子延迟复合提高了载流子分离效率.因此与对照组样品对比,该复合物对有机污染物的光催化降解能力有显著提高.

关键词：自旋角动量室温磷光激发波长载流子分离三重态碳量子点含氧官能团高温热解

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Temperature-Compensated Fabry–Perot Fiber-Optic Microcavity Biosensor for the Detection of Label-Free Deafness Gene DNA

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IEEE Sensors Journal 2025年第11期25卷 19223-19230页

作者： Wang, Lina Li, Chong Chen, Qiuting Wu, Shenbing Dai, Mingxia Geng, Youfu Li, Xuejin Yi, Duo Huainan Normal University College of Electronic Engineering Huainan232038 China Shenzhen University College of Physics and Optoelectronic Engineering Shenzhen Key Laboratory of Sensor Technology Shenzhen518060 China Chinese University of Hong Kong School of Science and Engineering Shenzhen518172 China

A fiber-optic DNA biosensor with temperature compensation for the specific detection of label-free deafness gene is proposed and demonstrated. The biosensor is fabricated by splicing a section of exposed-core microstructure fiber (ECF) between two single-mode fibers (SMFs) to form an optical fiber microcavity Fabry-Perot interferometer (FPI). The ECF eliminates the temperature cross-sensitivity and improves the sensitivity of the sensor. In this study, a sensitive film layer is prepared by coating poly-L-lysine (PLL) on the surface of the sensor. The probe DNA (pDNA) is immobilized on the surface by layer-by-layer assembly. The sensor can detect local refractive index (RI) changes that occur on the surface of the fiber due to the specific binding of complementary DNA (cDNA) to pDNA. Therefore, the sensor can achieve high sensitivity and high selectivity detection of cDNA. Experimental results show that the sensor can detect cDNA concentrations as low as 1 μM by demodulating the phase change of the interference spectrum. The proposed fiber-optic DNA biosensor has the ability to label free, selective, and real-time detection, and has broad application prospects in the fields of medical diagnosis, cancer screening, and environmental science. © 2001-2012 IEEE.

关键词： Fabry-Perot interferometers

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