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Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal

National science Review 2024年第11期11卷 47-53页

作者： Peiheng Zhou Gui-Geng Liu Zihao Wang Shuwei Li Qindong Xie Yunpeng Zhang Subhaskar Mandal Xiang Xi Zhen Gao Longjiang Deng Baile Zhang National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of EducationUniversity of Electronic Science and Technology of China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University School of Electrical Engineering and Intelligentization Dongguan University of Technology Department of Electronic and Electrical Engineering Southern University of Science and Technology Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological University

The field of topological photonics was initiated with the realization of a Chern insulator phase in a gyromagnetic photonic crystal(Ph C) with broken time-reversal symmetry(T), hosting chiral edge states that are topologically protected propagating modes. Along a separate line of research, a quadrupole topological insulator was the first higher-order topological phase supporting localized corner states, but has been so far limited to T-invariant systems, as T is a key ingredient in early models. Here we report the realization of a quadrupole topological insulator phase in a gyromagnetic Ph C, as a consequence of topological phase transition from the previously demonstrated Chern insulator phase. The phase transition has been demonstrated with microwave measurements, which characterize the evolution from propagating chiral edge states to localized corner states. We also demonstrate the migration of topological boundary states into the continuum, when the gyromagnetic Ph C is magnetically tuned. These results extend the quadrupole topological insulator phase into T-broken systems, and integrate topologically protected propagating and localized modes in a magnetically tunable photonic crystal platform.

关键词： quadrupole topological insulator time-reversal symmetry breaking corner states topological phase transition

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Catalytically active atomically thin cuprate with periodic Cu single sites

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National science Review 2023年第1期10卷 226-235页

作者： Huimin Yang Shibo Xi Na Guo Mu Wang Lingmei Liu Pin Lyu Xiaolong Yu Jing Li Haomin Xu Xiao Hai Zejun Li Xinzhe Li Tao Sun Xiaoxu Zhao Yu Han Wei Yu Jie Wu Chun Zhang Honghan Fei Ming Joo Koh Jiong Lu Department of Chemistry National University of Singapore Institute of Chemical and Engineering Sciences Department of Physics National University of Singapore Advanced Membranes and Porous Materials Center King Abdullah University of Science and Technology SDU-ANU Joint Science College Shandong University School of Materials Science and Engineering Peking University Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore Department of Chemistry Tongji University

Rational design and synthesis of catalytically active two-dimensional（2D） materials with an abundance of atomically precise active sites in their basal planes remains a great ***,we report a ligand exchange strategy to exfoliate bulk [Cu4（OH）6] [O3S（CH2）4SO3] cuprate crystals into atomically thin 2D cuprate layers([Cu2（OH）3]+).The basal plane of 2D cuprate layers contains periodic arrays of accessible unsaturated Cu（Ⅱ） single sites（2D-CuSSs）,which are found to promote efficient oxidative Chan-Lam *** me chanistic studies reveal that the reactions proceed via coordinatively unsaturated CuO4（Ⅰ） single sites with the formation of Cu（Ⅰ） species in the rate-limiting step,as corroborated by both operando experimental and theoretical *** robust stability of 2D-CuSSs in both batch and continuous flow reactions,coupled with their recyclability and good performance in complex molecule derivatization,render 2D-CuSSs attractive catalyst candidates for broad utility in fine chemical synthesis.

关键词： exfoliation nanosheet heterogeneous catalysis

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Accurate prediction of oxygen vacancy concentration with disordered A-site cations in high-entropy perovskite oxides

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npj Computational materials 2023年第1期9卷 2053-2065页

作者： Jiyun Park Boyuan Xu Jie Pan Dawei Zhang Stephan Lany Xingbo Liu Jian Luo Yue Qi School of Engineering Brown UniversityProvidenceRI 02912USA Department of Physics Brown UniversityProvidenceRI 02912USA Department of Chemical Engineering and Materials Science Michigan State UniversityEast LansingMI 48824USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Materials Science Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Mechanical and Aerospace Engineering Benjamin M.Statler College of Engineering and Mineral ResourcesWest Virginia UniversityMorgantownWV 26506USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA

Entropic stabilized ABO_(3) perovskite oxides promise many applications,including the two-step solar thermochemical hydrogen(STCH)*** binary and quaternary A-site mixed{A}FeO_(3) as a model system,we reveal that as more cation types,especially above four,are mixed on the A-site,the cell lattice becomes more cubic-like but the local Fe–O octahedrons are more *** comparing four different Density Functional Theory-informed statistical models with experiments,we show that the oxygen vacancy formation energies(E^(f)_(V))distribution and the vacancy interactions must be considered to predict the oxygen non-stoichiometry(δ)*** STCH applications,the E^(f)_(V) distribution,including both the average and the spread,can be optimized jointly to improveΔδ(difference ofδbetween the two-step conditions)in some hydrogen production *** model can be used to predict the range of water splitting that can be thermodynamically improved by mixing cations in{A}FeO_(3) perovskites.

关键词： perovskite vacancy oxides

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Improving the electro-optical properties of cholesteric liquid crystal devices via cellulose nanoparticle dopants

Polymer Journal

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Polymer Journal 2024年第5期56卷 541-551页

作者： Kuo, Chung-Yu Emelyanenko, A.V. Hung, Sheng-Chi Chen, Wei-Chuan Liu, Chun-Yen Department of Materials Science and Engineering National Cheng Kung University Tainan701401 Taiwan Faculty of Physics Lomonosov Moscow State University Moscow119991 Russia

In the presence of a strong electric field, helices in a cholesteric liquid crystal (CLC) phase might be unwound, leaving liquid crystal (LC) molecules parallel to the electric field, thereby realizing transparency. Previously, we developed a novel particle-doped CLC cell without alignment layers that exhibited liquid crystal display (LCD) capabilities via electro-optical properties. This ability represents a novel advancement in LCD fabrication, resulting in enhanced electro-optical characteristics. To explore the impact of chirality on LCDs, we synthesized and radially constructed cellulose particles. These were then employed as chiral dopants in the production of LCD cells. The fabricated chiral nanoparticle (CNP)-doped PC05 CLC cell showed a high transparency of 97.4% and a fast response time of 7.6 ms. For the prepared radially constructed PDAT-doped PD2T PSCLC cell, a high transmittance of 93.6% and a fast response time of 13 ms were achieved. Fabrication of LCD cells without an alignment layer on substrates was achieved by indicate adding polymeric chiral nanoparticles into CLC mixtures. Adding 2 wt% chiral CNPs promoted the transmittance of the CLCs from 3.4 to 97%. This novel chiral dopant technique enables the use of a new easy method for the fabrication of LCDs. © The Author(s), under exclusive licence to The Society of Polymer science, Japan 2024.

关键词： Cholesteric liquid crystals

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Enhanced magnetoelectric coupling in two-dimensional hybrid multiferroic heterostructures

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Physical Review B 2024年第16期110卷 165408页

作者： Xilong Xu Li Yang Department of Physics Institute of Materials Science and Engineering

Magnetoelectric coupling in insulating multiferroic materials is invaluable for both fundamental research and multifunctional device applications. However, material realization remains a significant challenge. We employ first-principles calculations to predict an enhanced and stacking-robust magnetoelectric coupling in a multiferroic van der Waals heterostructure consisting of CrCl3 and CuCrP2S6. Within this heterostructure, the intralayer ferroic orders exhibit characteristics of a type-I multiferroic, while the interlayer ferroic orders resemble those of a type-II multiferroic, thus creating a hybrid-type multiferroic. Notably, the interlayer magnetic configuration can be switched upon electric-polarization reversal, while maintaining the insulating property without any nontrivial phase transitions. Our analysis reveals a strongly interfacial spin local-field effect and proximity polarization effect on band alignments. These factors work synergistically to decide the interlayer exchange interaction and drive enhanced magnetoelectric coupling. Finally, we show that this magnetoelectric effect is robust in multilayer structures, exhibiting a dependence on the layer number's parity. This research offers promising prospects for discovering enhanced magnetoelectric couplings in hybrid multiferroic van der Waals heterostructures.

关键词： Magnetoelectric effect 2-dimensional systems Heterostructures Multiferroics First-principles calculations Hybrid functionals

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In situ Simulation of Thermal Reality

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Research 2024年第2期2023卷 685-690页

作者： Peng Jin Jinrong Liu Fubao Yang Fabio Marchesoni Jian-Hua Jiang Jiping Huang Department of Physics State Key Laboratory of Surface Physicsand Key Laboratory of Micro and Nano Photonic Structures(MOE)Fudan UniversityShanghai 200438China Center for Phononics and Thermal Energy Science Shanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologySchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Physics University of CamerinoCamerino 62032Italy Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou 215123China

Simulated reality encompasses virtual,augmented,and mixed realities梕ach characterized by different degrees of truthfulness in the visual perception:"all false","coexistence of true and false,"and"difficult distinction between true and false,"*** all these technologies,however,the temperature rendering of virtual objects is still an unsolved ***,the lack of thermal tactile functions substantially reduces the quality of the user's real-experience *** address this challenge,we propose theoretically and realize experimentally a technological platform for the in situ simulation of thermal *** this purpose,we design a thermal metadevice consisting of a reconfigurable array of radiating units,capable of generating the thermal image of any virtual object,and thus rendering it in situ together with its thermal *** is a substantial technological advance,which opens up new possibilities for simulated reality and its applications to human activities.

关键词： false rendering signature

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Tunable polar distortions and magnetism in GdxLa1−xPtSb epitaxial films

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Physical Review materials 2024年第10期8卷 104413页

作者： Dongxue Du Chenyu Zhang Jingrui Wei Yujia Teng Konrad T. Genser Paul M. Voyles Karin M. Rabe Jason K. Kawasaki Materials Science and Engineering Department of Physics and Astronomy

Hexagonal ABC intermetallics are predicted to have tunable ferroelectric, topological, and magnetic properties as a function of the polar buckling of BC atomic planes. We report the impact of isovalent lanthanide substitution on the buckling, structural phase transitions, and electronic and magnetic properties of GdxLa1−xPtSb films grown by molecular beam epitaxy (MBE) on c plane sapphire substrates. The GdxLa1−xPtSb films form a solid solution from x=0 to x=1 and retain the polar hexagonal structure (P63mc) out to x≤0.95. With increasing x, the PtSb buckling increases and the out-of-plane lattice constant c decreases due to the lanthanide contraction. While hexagonal LaPtSb is a highly conductive polar metal, the carrier density decreases with x until an abrupt phase transition to a zero band overlap semimetal is found for cubic GdPtSb at x=1. The magnetic susceptibility peaks at small but finite x, which we attribute to Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between localized 4f moments, whose concentration increases with x, and free carriers that decrease with x. Samples with x≥0.3 show antiferromagnetic Curie-Weiss behavior and a Neel temperature that increases with x. The GdxLa1−xPtSb system provides opportunities to dramatically alter the polar buckling and concentration of local 4f moments.

关键词： Electronic structure Ferroelectricity Magnetism Molecular beam epitaxy

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Atomic layer deposition of zinc oxide onto 3D porous iron scaffolds for bone repair:in vitro degradation,antibacterial activity and cytocompatibility evaluation

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Rare Metals 2022年第2期41卷 546-558页

作者： Yu-Lei Li Jin He Hai-Xia Ye Can-Can Zhao Wei-Wei Zhu Xiong Lu Fu-Zeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Institute of Applied Physics and Materials Engineering Faculty of Science and TechnologyUniversity of MacaoMacao 999078China Key Lab of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

3D porous iron(Fe)scaffolds with interconnected open pores are promising candidates for bone ***,the bare 3D porous Fe scaffolds lack of antibacterial activity and the ability for cell ***,atomic layer deposition technique was used to deposit nanometer-thick zinc oxide(ZnO)layer onto the skeleton of 3D porous Fe scaffolds with interconnected open *** effect of ZnO thin film on the in vitro degradation behavior,antibacterial activity and cytocompatibility of 3D porous Fe scaffolds was systematically *** results showed that a dense ZnO thin film with a thickness of 76 nm was uniformly deposited on the skeleton of the porous Fe *** thickness of ZnO thin film could be easily controlled by the deposition *** deposited ZnO thin film significantly reduced the degradation rate of porous Fe scaffolds and the fabricated ZnO coated porous Fe scaffolds demonstrated strong antibacterial ability against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus,while did not significantly affect cytocompatibility and could also promote cell adhesion.

关键词： Atomic layer deposition Porous iron scaffolds ZnO Antibacterial activity

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Rational design of comb-like 1D-1D ZnO-ZnSe heterostructures toward their excellent performance in flexible photodetectors

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Nanoscale 2024年第23期16卷 11203-11210页

作者： Liu, Ming-Jin Chen, Hsuan-Chu Yang, Tse-Ning Wu, Shu-Chi Kuo, Yao-Jen Cyu, Ruei-Hong Peng, Yu-Ren Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing-Hua University 30013 Taiwan College of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of

One-dimensional (1D) Zn-based heterostructures have attracted considerable interest in the field of photodetection because of their tunable properties, flexibility, and unique optoelectronic properties. However, designing 1D multi-component Zn-based heterostructures for advanced photodetectors is still a great challenge. Herein, comb-like 1D-1D ZnO-ZnSe heterostructures with ZnO and ZnSe nanowires (NWs) comprising the shaft and teeth of a comb are reported. The length of the ZnO NWs can be modulated in the range of 300-1200 nm. Microstructural characterizations confirm that the 1D heterostructure clearly shows the spatial distribution of individual components. The well-designed structure displays an extended broadband photoresponse and higher photosensitivity than pure ZnSe NWs. Furthermore, ZnSe NWs with an appropriate length of ZnO branches show increased photoresponses of 3835% and 798% compared to those of pure ZnSe NWs under green and red-light irradiation, respectively. In addition, the integrated flexible photodetector presents excellent folding endurance after 1000 bending tests. This well-designed structure has significant potential for other 1D-based semiconductors in optoelectronic applications. © 2024 The Royal Society of Chemistry.

关键词： Heterojunctions

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Phonon-induced nonadiabatic and adiabatic mechanisms synergistically driving ultrafast interlayer transfer of photogenerated charges in heterostructures of g−C3N4 with MoTe2 and WTe2

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Physical Review B 2024年第16期110卷 165302页

作者： Weibo Li Xiao Tang Yahui Zheng Haidi Wang Zhao Chen Weiduo Zhu Hongyan Lv Chunhua Wang Xiaofeng Liu Haixiao Xiao Xiao Cheng Zeng Zhongjun Li School of Physics Department of Materials Science and Engineering

Phonon vibration excitation is an effective approach to enhance photoelectric conversion efficiency of g−C3N4-based heterostructures, yet the influencing mechanism on interlayer transfer of photogenerated charges remains unclear. Herein, we show first-principles evidence of using g−C3N4/ transition metal dichalcogenide (MoTe2 and WTe2) heterostructures to achieve ultrafast interlayer transfer of photogenerated electrons and holes at the timescales of 4 ps and 200 fs, respectively. Our findings reveal that the fast transfers of photogenerated electrons and holes are both promoted by a nonadiabatic (NA) mechanism, driven via the coupling of donor and acceptor electronic states with the same phonon state. Notably, this coupling in the valence bands is significantly stronger than that in the conduction bands, which enhances interface atom motion, reduces interface distance, and strengthens wave-function overlap of spatial localized electronic states, thereby synergistically producing much faster hole transfer. Moreover, the hole transfer is also enhanced by an adiabatic (AD) mechanism through phonon-induced crossing of valence bands. Our study identifies that the synergistic effects of phonon-induced NA and AD mechanisms play a key role in interlayer transfer of photogenerated charges within g−C3N4-based heterostructures.

关键词： Charge dynamics Electron-phonon coupling Electronic structure Lattice dynamics 2-dimensional systems Interfaces Surfaces Transition metal dichalcogenides Density functional theory First-principles calculations

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