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SSRN 2023年

作者： Sun, Dawei Wang, Jiaxin Wang, Hui Yan, Zheng Ma, Wenxu Ma, Xiaoyu Wang, Yali Ma, Zhongcheng Jin, Xiaodong Sun, Shibing Cui, Suping Wang, Zhiyong College of Materials Science and Engineering Beijing University of Technology Beijing100124 China State Key Laboratory of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Sciences Research Beijing100041 China Key Technologies R&D Program CNBM China

In epoxy-amine based self-healing cement-based materials, the uncontrollable stoichiometric ratio of both components in the cracks leads to the cured epoxy resin with various crosslink densities. Investigate the interaction mechanism between cured epoxy resin and C-S-H gel help us to optimize the final self-healing performances. In this work, the interaction between load-induced broken panels of C-S-H gel and cured epoxy resins with different crosslink densities (e.g., 0.23, 0.77, and 0.97) was studied through molecular dynamic methods. It was found that crosslink density plays an essential role in the geometrical size and atom distributions. Phase separation occurs at the low crosslink density due to the aggregation of amine molecules. The generation of fresh crosslink points limits the free motion of epoxy molecules with higher crosslink density. Meanwhile, the cured epoxy resin with higher crosslink density causes a high porosity in the interfacial region between the epoxy resin and C-S-H gel substrates. © 2023, The Authors. All rights reserved.

关键词： Epoxy resins

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Generation of spatiotemporal acoustic vortices with arbitrarily oriented orbital angular momentum

arXiv

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arXiv 2024年

作者： Liu, Shuai Ge, Hao Xu, Xiang-Yuan Sun, Yuan Liu, Xiao-Ping Lu, Ming-Hui Chen, Yan-Feng National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Jiangsu Nanjing210093 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Jiangsu Key Laboratory of Artificial Functional Materials Jiangsu Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Despite extensive exploration of acoustic vortices carrying orbital angular momentum (OAM), the generation of acoustic vortices with OAM orientations beyond the conventional longitudinal direction remains largely unexplored. Spatiotemporal (ST) vortices, featuring spiral phase twisting in the ST domain and carrying transverse OAM, have recently attracted considerable interest in optics and acoustics. Here, we report the generation of three-dimensional (3D) ST acoustic vortices with arbitrarily oriented OAM, thereby opening up a new dimension in acoustic OAM control. By utilizing a two-dimensional (2D) acoustic phased array, we introduce two approaches to manipulate the orientation of OAM: through the direct rotation of vortices in 3D space and the intersection of vortices carrying distinct types of OAM. These methods enable unprecedented control over the orientation of acoustic OAM, providing a new degree of freedom in the manipulation of acoustic waves. The arbitrarily oriented OAM holds promise for enhancing acoustic communication by broadening capacity and enabling more complex particle manipulation techniques. Our work establishes a foundation for future explorations into the complex dynamics of novel structured acoustic fields in the ST domain. Copyright © 2024, The Authors. All rights reserved.

关键词： Vortex flow

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Heterogeneously integrated quantum-dot emitters efficiently driven by a quasi-BIC-supporting dielectric nanoresonator

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Photonics Research 2022年第8期10卷 1971-1977页

作者： LI LIU RUXUE WANG XUYI ZHAO WENFU YU YI JIN QIAN GONG AIMIN WU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Centre for Optical and Electromagnetic Research and International Research Center for Advanced Photonics College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

Bound states in the continuum(BICs) can make subwavelength dielectric resonators sustain low radiation leakage, paving a new way to minimize the device size, enhance photoluminescence, and even realize lasing. Here, we present a quasi-BIC-supporting Ga As nanodisk with embedded In As quantum dots as a compact bright on-chip light source, which is realized by heterogeneous integration, avoiding complex multilayered construction and subsequent mismatch and defects. The emitters are grown inside the nanodisk to match the mode field distribution to form strong light–matter interaction. One fabricated sample demonstrates a photoluminescence peak sustaining a quality factor up to 68 enhanced by the quasi-BIC, and the emitting effect can be further promoted by improving the epilayer quality and optimizing the layer-transferring process in the fabrication. This work provides a promising solution to building an ultracompact optical source to be integrated on a silicon photonic chip for high-density integration.

关键词： emitter resonator dielectric

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Low noise Tm-fiber laser comb via nonlinear amplifying loop mirror

Low noise Tm-fiber laser comb via nonlinear amplifying loop ...

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2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO/PR 2022

作者： Lin, Jincan Zha, Zimin Liu, Huanhuan Zhou, Jiaqi Guo, Hairun Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai200444 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Key Laboratory of Solid-State Laser and Application Shanghai Institute of Optics and Fine Mechanics CAS Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of Sciences Beijing100049 China

We have setup an all polarization maintaining mode-locked Tm-fiber laser with nonlinear amplifying loop mirror, which is intrinsically of low noise and is readily for optical frequency comb applications at the onset o... 详细信息

关键词： Fiber lasers

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Modification of NASICON Electrolyte and Its Application in Real Na-Ion Cells

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engineering 2022年第1期8卷 170-180页

作者： Qiangqiang Zhang Quan Zhou Yaxiang Lu Yuanjun Shao Yuruo Qi Xingguo Qi Guiming Zhong Yong Yang Liquan Chen Yong-Sheng Hu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Xiamen Institute of Rare-Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021China State Key Laboratory of Physical Chemistry of Solid Surfaces&Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China HiNa Battery Technology Co. Ltd.Liyang 213300China Yangtze River Delta Physics Research Center Co. Ltd.Liyang 213300China

The low ionic conductivity of solid-state electrolytes(SSEs)and the inferior interfacial reliability between SSEs and solid-state electrodes are two urgent challenges hindering the application of solid-state sodium batteries(SSSBs).Herein,sodium(Na)super ionic conductor(NASICON)-type SSEs with a nominal composition of Na_(3+2x)Zr_(2-x)MgxSi_(2)PO_(12) were synthesized using a facile two-step solid-state method,among which Na_(3.3)Zr_(1.85)Mg_(0.15)Si_(2)PO_(12)(x=0.15,NZSP-Mg_(0.15))showed the highest ionic conductivity of 3.54mS∙cm^(-1) at 25℃.By means of a thorough investigation,it was verified that the composition of the grain boundary plays a crucial role in determining the total ionic conductivity of ***,due to a lack of examination in the literature regarding whether NASICON can provide enough anodic electrochemical stability to enable high-voltage SSSBs,we first adopted a high-voltage Na_(3)(VOPO_(4))2F(NVOPF)cathode to verify its compatibility with the optimized NZSP-Mg_(0.15) *** comparing the electrochemical performance of cells with different configurations(low-voltage cathode vs high-voltage cathode,liquid electrolytes vs SSEs),along with an X-ray photoelectron spectroscopy evaluation of the after-cycled NZSP-Mg_(0.15),it was demonstrated that the NASICON SSEs are not stable enough under high voltage,suggesting the importance of investigating the interface between the NASICON SSEs and high-voltage ***,by coating NZSP-Mg_(0.15) NASICON powder onto a polyethylene(PE)separator(PE@NASICON),a 2.42 A∙h non-aqueous Na-ion cell of carbon|PE@NASICON|NaNi_(2/9)Cu_(1/9)Fe_(1/3)Mn_(1/3)O_(2) was found to deliver an excellent cycling performance with an 88%capacity retention after 2000 cycles,thereby demonstrating the high reliability of SSEs with NASICON-coated separator.

关键词： solid-state electrolytes solid-state sodium batteries NASICON Interface Separator Coating

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Fluorescence detection of hydroxyl radical generated from oxygen reduction on Fe/N/C catalyst

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science China Chemistry 2020年第2期63卷 198-202页

作者： Li-Na Chen Wen-Song Yu Tao Wang Xiao-Dong Yang Hui-Juan Yang Zhi-Xin Chen Tan Wang Na Tian Zhi-You Zhou Shi-Gang Sun State Key Laboratory of Physical Chemistry of Solid Surfaces Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Materials Science&Engineering Huaqiao UniversityXiamen 361021China Institute of Advanced Electrochemical Energy School of Materials Science and EngineeringXi'an University of TechnologyXi'an 710048China

Pyrolyzed Fe/N/C catalyst has been considered as the most promising candidate to replace Pt for oxygen reduction reaction(ORR) in fuel ***,poor stability of Fe/N/C catalyst,mainly attributed to the oxidation corrosion by aggressive ·OH radical,severely hampers its ***,the exact mechanism for generation of ·OH is unclear ***,we developed a fluorescent method to effectively detect ·OH generated from ORR on Fe/N/C catalyst by using coumarin as a fluorescent probe.A great difference in potential dependence between ·OH and H2O2 generated from the ORR was observed,which suggests that ·OH is not generated from the decomposition of H2O2 as traditional viewpoint.

关键词： oxygen reduction reaction Fe/N/C catalysts radical coumarin fluorescent probe

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Low noise Tm-fiber laser comb via nonlinear amplifying loop mirror

Low noise Tm-fiber laser comb via nonlinear amplifying loop ...

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2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022

ISBN: (纸本)9798350350012

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Temperature dependent anisotropy and two-band superconductivity revealed by lower critical field in organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

arXiv

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arXiv 2023年

作者： Mu, Huijing Si, Jin Yang, Qingui Xiang, Ying Yang, Haipeng Wen, Hai-Hu National Laboratory of Solid State Microstructures Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China College of Materials Science and Engineering Shenzhen Key Laboratory of Polymer Science and Technology Shenzhen University Shenzhen518060 China

Resistivity and magnetization have been measured at different temperatures and magnetic fields in organic superconductors κ-(BEDT-TTF)2Cu[N(CN)2]Br. The lower critical field and upper critical field are determined, which allow to depict a complete phase diagram. Through the comparison between the upper critical fields with magnetic field perpendicular and parallel to the conducting ac-planes, and the scaling of the in-plane resistivity with field along different directions, we found that the anisotropy Γ is strongly temperature dependent. It is found that Γ is quite large (above 20) near Tc, which satisfies the 2D model, but approaches a small value in the low-temperature region. The 2D-Tinkham model can also be used to fit the data at high temperatures. This is explained as a crossover from the orbital depairing mechanism in high-temperature and low-field region to the paramagnetic depairing mechanism in the high-field and low-temperature region. The temperature dependence of lower critical field Hc1(T) shows a concave shape in wide temperature region. It is found that neither a single d-wave nor a single s-wave gap can fit the Hc1(T), however a two-gap model containing an s-wave and a d-wave can fit the data rather well, suggesting two-band superconductivity and an unconventional pairing mechanism in this organic superconductor. Copyright © 2023, The Authors. All rights reserved.

关键词： Magnetic fields

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Magnetically disordered ground state in the triangular-lattice antiferromagnets Rb3Yb(VO4)2 and Cs3Yb(VO4)2

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Physical Review B 2025年第15期111卷 155141-155141页

作者： Zhen Ma Yingqi Chen Zhongtuo Fu Shuaiwei Li Xin-An Tong Hong Du Jan Peter Embs Shuhan Zheng Yongjun Zhang Meifeng Liu Ruidan Zhong Jun-Ming Liu Jinsheng Wen Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi 435002 China Tsung-Dao Lee Institute & School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China PSI Center for Neutron and Muon Sciences 5232 Villigen PSI Switzerland National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures and Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China

Quantum spin liquids (QSLs) represent a unique quantum disordered state of matter that hosts long-range quantum entanglement and fractional excitations. However, structural disorder resulting from site mixing between different types of ions usually arises in real QSL candidates, which is considered to be an obstacle to gaining insight into the intrinsic physics. Here, we have synthesized two new rare-earth compounds, Rb3Yb(VO4)2 and Cs3Yb(VO4)2. X-ray diffractions reveal a perfect triangular-lattice structure with no detectable disorder. Magnetic susceptibility measurements do not capture any phase transition or spin freezing down to 1.8 K. A fit to low-temperature data indicates dominant antiferromagnetic interactions with a Curie-Weiss temperature of −1.40 and −0.43 K for Rb3Yb(VO4)2 and Cs3Yb(VO4)2, respectively. Specific-heat results show no sign of long-range magnetic order down to ∼0.1K either, but only a Schottky anomaly that is continuously mediated by the external magnetic fields. Additionally, inelastic neutron scattering is employed to detect low-energy spin excitations in Rb3Yb(VO4)2. The absence of magnetic excitation signals as well as static magnetic order down to 97 mK aligns with the results from magnetic susceptibility and specific heat. Collectively, these findings point to a quantum disordered ground state with persistent spin dynamics, reminiscent of QSL behaviors. Our work provides a promising platform for further exploration of quantum magnetism in this new disorder-free system.

关键词： Quantum entanglement

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Universal phonon softening in the pseudogap state of Tl2Ba2Can−1CunO2n+4+δ

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Physical Review B 2023年第22期107卷 224508-224508页

作者： Jia-Wei Hu Kai Zhang Yong-Chang Ma Nan-Lin Wang Viktor V. Struzhkin Alexander F. Goncharov Hai-Qing Lin Xiao-Jia Chen Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Earth and Planets Laboratory Carnegie Institution for Science Washington DC 20015 USA School of Physics Zhejiang University Hangzhou 310058 China Department of Physics and TcSUH University of Houston Houston Texas 77204 USA

Exploring the origin of the pseudogap is important for the understanding of superconductivity in cuprates. Here we report a systematical experimental study on the phonon vibrational properties of Tl2Ba2Can−1CunO2n+4+δ (n=1,2,3) single crystals based on the Raman scattering measurements over the temperature range from 10–300 K. The temperature evolution of the frequency and linewidth of the observed phonon modes in each member of this family does not follow the expected self-energy effect when entering the superconducting state. The anomalies are observed for the phonon modes involving the vibrations of the atoms in the Tl-O layer and the apical oxygen at the temperature around 150 K, which is higher above the superconducting transition. The phonon mode of the apical oxygen exhibits a pronounced universal softening behavior. From the comparison with the existing experimental data for various orders, we find that the observed starting temperature for the phonon softening corresponds to the onset opening temperature of the pseudogap. This finding indicates a large lattice effect in the pseudogap state and the non-negligible spin-phonon coupling for such a phonon softening.

关键词： Pairing mechanisms High-temperature superconductors Light scattering Raman spectroscopy

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