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Pseudospin-induced asymmetric field in non-Hermitian photonic crystals with multiple topological transitions

Physical Review B 2025年第8期111卷 085148-085148页

作者： Yuchen Peng Aoqian Shi Peng Peng Jianjun Liu Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 China Greater Bay Area Institute for Innovation Hunan University Guangzhou 511300 China

We report the discovery of multiple topological phase transitions induced by the photonic quantum spin Hall effect (PQSHE) in a non-Hermitian photonic crystal (PhC). When increasing the magnitude of the non-Hermitian terms, the system undergoes transitions from topological corner states to topological edge states and subsequently to topological bulk states. The angular momentum of the wave function of the out-of-plane electric field excited by the chiral source acts as the pseudospin degree of freedom in the PQSHE. Therefore, we consider the introduction of chiral sources with different circular polarizations into non-Hermitian PhCs and observe the emergence of asymmetric field responses. These results are expected to enable the multidimensional manipulation of topological states, offering an avenue for the detection of chiral sources.

关键词： Spin Hall effect

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Review on metal halide perovskite-based optoelectronic synapses

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Photonics Research 2023年第5期11卷 787-807页

作者： XITONG HONG XINGQIANG LIU LEI LIAO XUMING ZOU Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China State Key Laboratory for Chemo/Biosensing and Chemometrics College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China

With the progress of both photonics and electronics,optoelectronic synapses are considered potential candidates to challenge the von Neumann bottleneck and the field of visual bionics in the era of big *** are also regarded as the basis for integrated artificial neural networks(ANNs)owing to their flexible optoelectronic tunable properties such as high bandwidth,low power consumption,and high-density *** the recent years,following the emergence of metal halide perovskite(MHP)materials possessing fascinating optoelectronic properties,novel MHP-based optoelectronic synaptic devices have been exploited for numerous applications ranging from artificial vision systems(AVSs)to neuromorphic ***,we briefly review the application prospects and current status of MHP-based optoelectronic synapses,discuss the basic synaptic behaviors capable of being implemented,and assess their feasibility to mimic biological ***,we focus on the two-terminal optoelectronic synaptic memristors and three-terminal transistor synaptic phototransistors(SPTs),the two essential apparatus structures for optoelectronic synapses,expounding their basic features and operating ***,we summarize the recent applications of optoelectronic synapses in neuromorphic systems,including neuromorphic computing,high-order learning behaviors,and neuromorphic vision systems,outlining their potential opportunities and future development directions as neuromorphic devices in the field of artificial intelligence(AI).

关键词： artificial optoelectronic apparatus

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Isotropic or anisotropic screening in black phosphorous: Can doping tip the balance?

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Frontiers of physics 2020年第5期15卷 103-109页

作者： Zhi-Min Liu Ye Yang Yue Shao Zheng Qin-Jun Chen Ye-Xin Feng Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics&Devices School of Physics and ElectronicsHunan UniversityChangsha410082China

Black phosphorus(BP),a layered van der Waals(vdW)crystal,has umique in-plane band anisotropy and many resulting anisotropy properties such as the ffective mass,electron mobility,optical absorp-tion,thermal conductivity and plasmonie ***,whether anisotropic or isotropic charge screening exist in BP remains a controversial *** on first-principles calculations,we study the screening properties in both of single-layer and bulk BP,especially conoerning the role of *** charge doping,the single-layer and bulk phase BP show slight anisotropic *** and hole doping can increase the charge screening of BP and significantly change the relative static dielectric tensor elements along two different in-plane *** further study the charge density change induced by potassium(K)adatom near the BP surface,under different levels of charge *** calculated two-dimensional(2D)charge redlistribution patterns also confirm that doping can greatly ffect the screening feature and tip the balance between isotropic and anisotropice *** corroborate that screening in BP exhibits slight intrinsic anisotropy and doping has significant influenoe on its screening property.

关键词： first-principles calculation charge screening black phosphorus dielectric function doping

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Quasiperiodic photonic crystal fiber[Invited]

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Chinese Optics Letters 2023年第6期21卷 17-35页

作者：刘娥贤刘建军 College of Computer and Information Engineering Central South University of Forestry and TechnologyChangsha 410004China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

In the fields of light manipulation and localization,quasiperiodic photonic crystals,or photonic quasicrystals[PQs],are causing an upsurge in research because of their rotational symmetry and long-range orientation of transverse lattice arrays,as they lack translational *** allows for the optimization of well-established light propagation properties and has introduced new guiding ***,as a class,quasiperiodic photonic crystal fibers,or photonic quasicrystal fibers[PQFs],are considered to add flexibility and richness to the optical properties of fibers and are expected to offer significant potential applications to optical fiber *** this review,the fundamental concept,working mechanisms,and invention history of PQFs are *** progress in optical property improvement and its novel applications in fields such as dispersion control,polarization-maintenance,supercontinuum generation,orbital angular momentum transmission,plasmon-based sensors and filters,and high nonlinearity and topological mode transmission,are then reviewed in ***-type air-guiding PQFs supporting low attenuation propagation and regulation of photonic density states of quasiperiodic cladding and in which light guidance is achieved by coherent Bragg scattering are also ***,current challenges encountered in the guiding mechanisms and practical preparation techniques,as well as the prospects and research trends of PQFs,are also presented.

关键词： photonic quasicrystal fiber guiding mechanism guiding features and applications challenges and prospects

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Micro-tip manipulated origami for robust twisted few-layer graphene

arXiv

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arXiv 2025年

作者： Zou, Ruo-Jue Deng, Long Xue, Si-Min Cai, Feng-Fei Tong, Ling-Hui Zhang, Yang Tian, Yuan Zhang, Li Zhang, Lijie Qin, Zhihui Yin, Long-Jing Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha410082 China

Twisted few-layer graphene (tFLG) has emerged as an ideal model system for investigating novel strongly correlated and topological phenomena. However, the experimental construction of tFLG with high structural stability is still challenging. Here, we introduce a highly accessible method for fabricating robust tFLG by polymer micro-tip manipulated origami. Through using a self-prepared polymer micro-tip—which is composed of multiple dimethylpolysiloxane, poly(vinyl chloride), and graphite sheets—to fold graphene layers, we fabricated tFLG with different twist angles (0°-30°) and various layers, including twisted bilayers (1+1), twisted double-bilayers (2+2), twisted double-trilayers (3+3), and thicker layers. Even ABC-stacked tFLG were created, such as twisted ABC/ABC and ABC/ABA graphene coexisting in an ABC-ABA domain wall region. We found that the origami-fabricated tFLG exhibits high stability against thermal and mechanical perturbations including heating and transferring, which could be attributed to its special folding and tearing structures. Moreover, based on the rich types of samples, we revealed twist-angle and stacking-order dependent Raman characteristics of tFLG, which is valuable for understanding the stacking-modulated phonon spectroscopy. Our experiments provide a simple and efficient approach to construct structurally robust tFLG, paving the way for the study of highly stable twisted van der Waals heterostructures. © 2025, CC BY.

关键词： Van der Waals forces

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Dynamic reversal of Fano response of metagratings by rotation of linear polarization

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Physical Review B 2024年第3期110卷 035415-035415页

作者： Binghua Zhang Shengxuan Xia Wei Xu Xiang Zhai Hongju Li Lingling Wang Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics State Key Laboratory of Millimeter Waves Research Institute of Hunan University in Chongqing Chongqing 401120 China School of Electronic Science and Applied Physics

Fano resonance features asymmetric spectral line shape and holds numerous potential applications such as filters, sensors, lasers, nonlinear optics, and slow-light devices. However, general methods to achieve Fano resonance face substantial challenges because of their limited dynamic parametric tunability. Here, we present a theoretical demonstration of an alternate method to realize dynamically reversing the magnitude and line shape of the Fano profile in anisotropic bilayer metallic gratings by simply manipulating the polarization angle of incident light. By introducing an in-plane shift in one grating layer, the resonant phase of the hybridized plasmon modes formed within the bilayer system transforms between in phase and out of phase with the polarization direction, leading to the asymmetry reversal of the Fano line shape. This concept can be demonstrated and explained by applying a deduced temporal coupled-mode theory, which reveals that the asymmetry parameter q undergoes a sign reversal along with the reversal of Fano line shape. This theory is further examined with the results of numerical simulations, finding excellent agreement between them. Our proposed approach enables completely and dynamically reversing the spectral asymmetry of the Fano resonance in an anisotropic bilayer grating, showing potential for applications involving active control and manipulation of Fano resonance.

关键词： Fano resonance Metamaterials Nanophotonics Near-field optics Plasmonics

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SbVO4 based high capacity potassium anode:a combination of conversion and alloying reactions

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Science China Chemistry 2021年第2期64卷 238-244页

作者： Xianhui Yi Junmin Ge Jiawan Zhou Jiang Zhou Bingan Lu Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Materials Science and Engineering Central South UniversityChangsha 410083China

As the key to optimizing potassium ion batteries’(PIBs)performance,the development of high capacity potassium anode is the ***,through a one-step solvothermal method,uniformly dispersed SbVO4 nanoparticles on the reduced graphene oxide nanosheets(SbVO4@RGO)were synthesized and used as PIBs ***4@RGO anode shows high capacity due to alloying and conversion reactions occur simultaneously in the cyclic *** anode delivers a capacity as high as 447.9 mAh g^-1 at 100 mA g^-***,a cycling life of 500 cycles with small average capacity decay rate(only 0.106%per cycle)is also *** was found in the initial discharge process,SbVO4 transforms into Sb and *** in the following cycle Sb and K3VO4 simultaneously react with K+via the alloying/de-alloying and conversion reaction,*** present study of SbVO4@RGO may provide insight for high performance alloying-based/conversion-based potassium anodes.

关键词： potassium-ion batteries SbVO4@RGO anode alloying conversion

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Acid-induced topological morphology modulation of graphitic carbon nitride homojunctions as advanced metal-free catalysts for OER and pollutant degradation

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Journal of Materials Science & Technology 2021年第27期86卷 210-218页

作者： Hua-Wei Zhang Yi-Xin Lu Bo Li Gui-Fang Huang Fan Zeng Yuan-Yuan Li Anlian Pan Yi-Feng Chai Wei-Qing Huang Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha410082China College of Materials Science and Engineering Hunan UniversityChangshaHunan410082China School of Physics and Electronics Science Hunan University of Science and TechnologyXiangtan411201China

Topological morphology that dominates the surface electronic properties of nanostructures plays a key role in producing desired materials for versatile functions and applications in many fields,but its modulation for specific functions remains a big ***,we report an acid-induced method to prepare S-doped graphitic carbon nitride/graphitic carbon nitride(S-CN/CN)homojunction by simply pyrolyzing a supramolecular precursor synthesized from melamine and H_(2)SO_(4).The topological morphology and electronic structure of CN homojunction can be easily adjusted only by changing the ratio of raw ***,the topological morphology of S-CN/CN homojunction can be further adjusted from hollow cocoon to 2D nanosheets by changing the annealing *** optimized S-CN/CN homojunction shows highly efficient in charge transfer and separation and exhibits superior OER activity and high ability to degrade organic ***,S-CN/CN nanosheets only demand low overpotential of301 m V to drive a current density of 10 m Acm^(-2)in 1 M KOH media,and the corresponding Tafel slope is only 57.71 m V/dec,which is superior to the most advanced precious metal Ir O_(2)***,under visible light irradiation,its photodegradation kinetic rate of Rh B is 2.38,which is 47.6 times higher than that of bulk *** work provides useful guidance for designing and developing efficient multifunctional metal-free catalysts.

关键词： Topological morphology Acid-induced Molecular self-assembly S-CN/CN homojunction OER

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Broadband high-efficiency dielectric metalenses based on quasi-continuous nanostrips

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Opto-Electronic Advances 2024年第5期7卷 43-51页

作者： Xiaohu Zhang Qinmiao Chen Dongliang Tang Kaifeng Liu Haimo Zhang Lintong Shi Mengyao He Yongcai Guo Shumin Xiao Key Laboratory of optoelectronic Technology and Systems of the Education Ministry of China Chongqing UniversityChongqing 400044China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Benefiting from the abrupt phase changes within subwavelength thicknesses,metasurfaces have been widely applied for lightweight and compact optical *** broadband and high-efficiency characteristics are highly attractive for the practical implementation of ***,current metasurface devices mostly adopt discrete micro/nano structures,which rarely realize both merits *** this paper,dielectric metasurfaces composed of quasi-continuous nanostrips are proposed to overcome this *** quasi-continuous nanostrips metasurface,a normal focusing metalens and a superoscillatory lens overcoming the diffraction limit are designed and experimentally *** quasi-continuous metadevices can operate in a broadband wavelength ranging from 450 nm to 1000nm and keep a high power *** average efficiency of the fabricated metalens reaches 54.24%,showing a significant improvement compared to the previously reported metalenses with the same *** proposed methodology can be easily extended to design other metadevices with the advantages of broadband and high-efficiency in practical optical systems.

关键词： broadband high-efficiency metalens sub-diffraction quasi-continuous

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Topological edge modes enable plasmon-induced transparency in isotropic and anisotropic 2D materials

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Optics Express 2025年第13期33卷 26974-26983页

作者： Di Zhang Xiang Zhai Shengxuan Xia Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 China Research Institute of Hunan University in Chongqing Chongqing 401120 China State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China

In this paper, we propose a plasmonically induced transparency (PIT) effect in 2D materials mediated by topological edge modes (TEMs). The topological PIT system consists of several units of the Su-Schrieffer-Heeger (SSH)-modeled multilayer nanoribbons coupled with a bus waveguide. Using isotropic graphene and anisotropic black phosphorus (BP) as prototypes, we demonstrate that establishing a topologically nontrivial phase enables the coexistence of bright and dark TEMs. These two modes generate a PIT spectral signature, accurately modeled by coupled mode theory. Compared to conventional PIT, our topology-driven design combines robustness with superior performance (e.g., higher Q-factors and figure of merit), while preserving topological protection against a certain degree of defect and disorders. This work presents a universal platform for designing PIT in plasmonic 2D materials, enabling topologically protected and high-performance PIT devices such as on-chip sensors.

关键词： Anderson localization Coupled mode theory Light propagation Nonlinear effects Optical fields Photonic crystals

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