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Robust asymmetric Cherenkov radiation in tilted anisotropic medium

science China(physics,Mechanics & Astronomy) 2024年第1期67卷 46-51页

作者： Shuwen Xue Yadong Xu Linkang Han Zhi Ning Chen Qiaoliang Bao Shan Zhu Huanyang Chen Institute of Electromagnetics and Acoustics and Department of Physics College of Physical Science and TechnologyJiujiang Research InstituteXiamen UniversityXiamen 361005China School of Physical Science and Technology Institute of Theoretical and Applied PhysicsSoochow UniversitySuzhou 215006China Department of Electrical and Computer Engineering National University of SingaporeSingapore 8117583Singapore Institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Cherenkov radiation(CR)is available for a wide variety of terahertz(THz)radiation sources,but its efficiency is deeply affected by intrinsic *** find that if the tilted angle(α)of anisotropic material and radiation angle(θ)meet the condition ofθ+α=π/2,the intensity of radiation fields for the charged particle bunch(CPB)moving from left to right cannot be influenced by intrinsic losses,which means long-distance radiation can be ***,we observe an asymmetric CR when the CPB moves from the opposite *** addition,we select natural van der Waals(vd W)materialα-MoO3as an example,further confirming that the radiation field can reach the far field and the asymmetric CR radiation can also be *** wonderful properties with long-distance radiation will extend the application of CR to a certain extent for future design and fabrication.

关键词： asymmetric Cherenkov radiation intrinsic losses long-distance radiation

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Enhancing multifunctional photocatalysis with acetate-assisted cesium doping and unlocking the potential of Z-scheme solar water splitting

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Carbon Energy 2024年第3期6卷 178-195页

作者： Mengmeng Ma Jingzhen Li Xiaogang Zhu Kong Liu Kaige Huang Guodong Yuan Shizhong Yue Zhijie Wang Shengchun Qu Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamenChina State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina

Graphitic carbon nitride(g-C_(3)N_(4))has been extensively doped with alkali metals to enlarge photocatalytic output,in which cesium(Cs)doping is predicted to be the most ***,the sluggish diffusion and doping kinetics of precursors with high melting points,along with imprecise regulation,have raised the debate on whether Cs doping could make *** this matter,we attempt to confirm the positive effects of Cs doping on multifunctional photocatalysis by first using cesium acetate with the character of easy *** optimized Csdoped g-C_(3)N_(4)(CCN)shows a 41.6-fold increase in visible-light-driven hydrogen evolution reaction(HER)compared to pure g-C_(3)N_(4) and impressive degradation capability,especially with 77%refractory tetracycline and almost 100%rhodamine B degradedwithin an *** penetration ofCs+is demonstrated to be a mode of interlayer doping,and Cs–N bonds(especially with sp^(2) pyridine N in C═N–C),along with robust chemical interaction and electron exchange,are *** atomic configuration triggers the broadened spectral response,the improved charge migration,and the activated photocatalytic ***,we evaluate the CCN/cadmium sulfide hybrid as a Z-scheme configuration,promoting the visible HER yield to 9.02 mmol g^(−1) h^(−1),which is the highest ever reported among all CCN *** work adds to the rapidly expanding field of manipulation strategies and supports further development of mediating served for photocatalysis.

关键词： acetate-assisted cesium doping multifunctional photocatalysis Z-scheme

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Simultaneous bottom-up double-layer synergistic engineering by multifunctional natural molecules for efficient and stable SnO2-based planar perovskite solar cells

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Journal of Energy Chemistry 2023年第5期80卷 40-47,I0002页

作者： Yue Liu Yanbo Gao Tingting Li Xinyu Bao Zehua Xu Fujun Zhang Min Lu Zhennan Wu Yanjie Wu Guang Sun Xue Bai Zhifeng Shi Junhua Hu Yu Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012 JilinChina School of Materials Science and Engineering Jilin Jianzhu UniversityChangchun 130018JilinChina China-Japan Union Hospital Jilin UniversityChangchun 130012jilinChina Key Laboratory of Materials Physics of Ministry of Education Department of Physics and EngineeringZhengzhou UniversityZhengzhou 402HenanChin State Centre for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina

The performance and stability of perovskite solar cells(PSCs)is limited by detrimental defects,mostly distributed at the grain boundary(GB)of bulk perovskite film and interface,which induce serious carrier non-radiative ***,there is particularly urgent to realize simultaneous passivation of bulk defects and interfacial *** this work,a simple,low-cost and effective multifunctional modification strategy is developed by introducing theλ-Carrageenan(λ-C)as the interfacial layer of SnO_(2)/*** sulfate groups ofλ-C not only play a positive role in passivating the Sn4+from SnO_(2)film,resulting in high conductivity,but also effectively passivate the defects at the SnO_(2)/perovskite ***,λ-C can effectively passivate the defects in the perovskite film due to the strong binding force between the high content of sulfate groups and *** synergistic effect ofλ-C simultaneously achieves interfacial defects and bulk defects passivation,better crystalline quality,suppressed charge recombination,released interfacial stress and more favorable interfacial energy level *** on the above efficient synergy,theλ-C-modified device achieves a high efficiency of 23.81%,which is~24.53%higher than the control device(19.12%).To our best knowledge,23.81%of power conversion efficiency(PCE)is the highest reported PCE value of PSCs employing green natural ***,long-term and thermal stabilities are significantly improved after interface ***,this work provides an idea for developing multifunctional natural materials towards the attainment of the efficient and stable PSCs.

关键词： Perovskite solar cells γ-Carrageenan Interfacial modification Stability Defect passivation

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Ab initio finite-temperature elasto-optic response in ferroelectrics: The case of BaTiO3 and Ba1−xSrxTiO3

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Physical Review B 2024年第22期110卷 L220102-L220102页

作者： Sergey Prosandeev Charles Paillard L. Bellaiche Smart Ferroic Materials Center Department of Physics and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Université Paris-Saclay CentraleSupélec CNRS Laboratoire SPMS 91190 Gif-sur-Yvette France Department of Materials Science and Engineering Tel Aviv University Ramat Aviv Tel Aviv 6997801 Israel

Elasto-optic effects characterize the dependency of optical birefringence on strain. Thus, by changing the strain, one can control the optical properties of the sample. Large elasto-optic effects are desirable to improve the sensitivity of elasto-optic devices, their performances, and lower their energy consumption. Yet, the microscopic mechanisms underlying elasto-optic conversion effects are not well understood. For example, the temperature dependencies of the elasto-optic effect as well as the effect of the concentration in solid solutions have not been investigated from first principles. Here, we develop a coupled density functional theory and effective Hamiltonian numerical method to compute and understand the elasto-optic response of ferroelectric materials at finite temperature. In particular, we apply such scheme to calculate the elasto-optic response of BaTiO3 and Ba1−xSrxTiO3 compounds in their tetragonal phase near room temperature, and report how elasto-optic coefficients can be significantly enhanced in the visible range. We also demonstrate that, and explain why, this effect can be enlarged in the THz-frequency range.

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Polarization pinning at antiphase boundaries in multiferroic YbFeO_(3)

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Chinese physics B 2024年第11期33卷 39-45页

作者： Guodong Ren Pravan Omprakash Xin Li Yu Yun Arashdeep S.Thind Xiaoshan Xu Rohan Mishra Institute of Materials Science and Engineering Washington University in St.LouisSt.LouisMO 63130USA Department of Physics and Astronomy University of NebraskaLincolnNE 68588USA Department of Mechanical Engineering & Mechanics Drexel UniversityPhiladelphiaPA 19104-2875USA Nebraska Center for Materials and Nanoscience University of NebraskaLincolnNE 68588USA Department of Mechanical Engineering and Material Science Washington University in St.LouisSt.LouisMO 63130USA

The switching characteristics of ferroelectrics and multiferroics are influenced by the interaction of topological defects with domain *** report on the pinning of polarization due to antiphase boundaries in thin films of the multiferroic hexagonal YbFeO_(3).We have directly resolved the atomic structure of a sharp antiphase boundary(APB)in YbFeO_(3) thin films using a combination of aberration-corrected scanning transmission electron microscopy(STEM)and total energy calculations based on density-functional theory(DFT).We find the presence of a layer of FeO_(6) octahedra at the APB that bridges the adjacent *** imaging shows a reversal in the direction of polarization on moving across the APB,which DFT calculations confirm is structural in nature as the polarization reversal reduces the distortion of the FeO_(6) octahedral layer at the *** APBs in hexagonal perovskites are expected to serve as domain-wall pinning sites and hinder ferroelectric switching of the domains.

关键词： hexagonal ferrites ferroelectric multiferroic topological defect STEM

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An autonomous design algorithm to experimentally realize three-dimensionally isotropic auxetic network structures without compromising density

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npj Computational materials 2024年第1期10卷 2068-2076页

作者： Meng Shen Marcos A.Reyes-Martinez Louise Ahure Powell Mark A.Iadicola Abhishek Sharma Fabian Byléhn Nidhi Pashine Edwin P.Chan Christopher L.Soles Heinrich M.Jaeger Juan Jde Pablo Pritzker School of Molecular Engineering The University of ChicagoChicagoIL 60637USA Materials Science and Engineering Division National Institute of Standards and TechnologyGaithersburgMD 20899USA Department of Physics The James Franck and Enrico Fermi InstitutesThe University of ChicagoChicagoIL 60637USA Department of Physics California State UniversityFullertonFullertonCA 92831USA

Auxetic materials have a negative Poisson’s ratio and are of significant interest in applications that include impact mitigation,membrane separations and biomedical *** there are numerous examples of structured materials that exhibit auxetic behavior,the examples of engineered auxetic structures is largely limited to periodic lattice structures that are limited to directional or anisotropic auxetic *** that exhibit a three-dimensionally isotropic auxetic response have been,unfortunately,slow to *** we introduce an inverse design algorithm based on global node optimization to design three-dimensional auxetic metamaterial structures from disordered *** specifying the target Poisson’s ratio for a structure,an inverse design algorithm is used to adjust the positions of all nodes in a disordered network structure until the desired mechanical response is *** proposed algorithm allows independent control of shear and bulk moduli,while preserving the density and connectivity of the *** the angle bending stiffness in the network is kept low,it is possible to realize optimized structures with a Poisson’s ratios as low as−*** the optimization,the bulk modulus of these networks decreases by almost two orders of magnitude,but the shear modulus remains largely *** materials designed in this manner are fabricated by dual-material 3D-printing,and are found to exhibit themechanical responses that were originally encoded in the computational design *** approach proposed here provides a materials-by-design platform that could be extended for engineering of optical,acoustic,and electrical properties,beyond the design of auxetic metamaterials.

关键词： modulus isotropic disordered

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Spin reorientation in easy-plane kagome ferromagnet Li_9Cr_3(P_2O_7)_3(PO_4)_2

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Chinese physics B 2023年第5期32卷 153-157页

作者：董元浩付盈刘以轩郝占阳王乐刘才邓可梅佳伟 Shenzhen Institute for Quantum Science and Engineering and Department of PhysicsSouthern University of Science and TechnologyShenzhen 518055China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

We report the successful growth and characterization of Li_9Cr_3(P_2O_7)_3(PO_4)_2single crystal,and investigate its magnetic properties under external magnetic fields via magnetization and heat capacity *** study reveals that Li_9Cr_3(P_2O_7)_3(PO_4)_2 is an easy-plane kagome ferromagnet with S=3/2,as evidenced by the Curie–Weiss temperature of 6 K which implies a ferromagnetic exchange coupling in the *** zero magnetic field,Li_9Cr_3(P_2O_7)_3(PO_4)_2 undergoes a magnetic transition at TC=2.7 K from a paramagnetic state to a ferromagnetically ordered state with the magnetic moment lying in the kagome *** applying a c-axis directional magnetic field to rotate the spin alignment from the kagome plane to the c-axis,we observe a reduction in the magnetic transition temperature as the field is *** construct a magnetic phase diagram as a function of temperature and magnetic field applied parallel to the c-axis of Li_9Cr_3(P_2O_7)_3(PO_4)_2 and find that the phase boundary is linear over a certain temperature *** that theoretically,the field-induced phase transition of the spin reorientation in the easy-plane ferromagnet can be viewed as the ferromagnetic magnon Bose–Einstein condensation(BEC),the phase boundary scaling of field-induced(B c)magnetic transition in Li_9Cr_3(P_2O_7)_3(PO_4)_2 can be described as the quasi-2D magnon BEC,which has been observed in other ferromagnetic materials such as K_2CuF_4.

关键词： kagome lattice flux method magnetic material spin-3/2

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Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

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Nano-Micro Letters 2023年第5期15卷 69-82页

作者： Liang Chen Huifen Yu Jie Wu Shiqing Deng Hui Liu Lifeng Zhu He Qi Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083People’s Republic of China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China

Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors ***,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy,named high-entropy strategy,realizing nearly ten times growth of energy storage density compared with low-entropy *** of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first *** achievement of excellent energy storage properties should be attributed to the enhanced random field,decreased nanodomain size,strong multiple local distortions,and improved breakdown ***,the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also *** significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics,promoting the development of advanced capacitors.

关键词： High-entropy Energy storage Lead-free Relaxor ferroelectrics Capacitors

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Large Spin Hall Conductivity and Excellent Hydrogen Evolution Reaction Activity in Unconventional PtTe1.75 Monolayer

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Research 2023年第3期2023卷 651-657页

作者： Dexi Shao Junze Deng Haohao Sheng Ruihan Zhang Hongming Weng Zhong Fang Xing-Qiu Chen Yan Sun Zhijun Wang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics Hangzhou Normal UniversityHangzhou 311121China. University of Chinese Academy of Sciences Beijing 100049China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefeiChina

Two-dimensional(2D)materials have gained lots of attention due to the potential *** this work,we propose that based on first-principles calculations,the(2×2)patterned PtTe_(2)monolayer with kagome lattice formed by the well-ordered Te vacancy(PtTe_(1.75))hosts large and tunable spin Hall conductivity(SHC)and excellent hydrogen evolution reaction(HER)*** unconventional nature relies on the A1@1b band representation of the highest valence band without spin–orbit coupling(SOC).The large SHC comes from the Rashba SOC in the noncentrosymmetric structure induced by the Te *** though it has a metallic SOC band structure,theℤ_(2)invariant is well defined because of the existence of the direct bandgap and is computed to be *** calculated SHC is as large as 1.25×10^(3)h/e(Ωcm)^(−1)at the Fermi level(EF).By tuning the chemical potential from EF−0.3 to EF+0.3 eV,it varies rapidly and monotonically from−1.2×10^(3)to 3.1×10^(3)h/e(Ωcm)^(−1)In addition,we also find that the Te vacancy in the patterned monolayer can induce excellent HER *** results not only offer a new idea to search 2D materials with large SHC,i.e.,by introducing inversion–symmetry breaking vacancies in large SOC systems,but also provide a feasible system with tunable SHC(by applying gate voltage)and excellent HER activity.

关键词： monolayer vacancy invariant

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Integrated study of morphology, structure, and dielectric behavior in PZT-SASF ceramics at the morphotropic phase boundary

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Ceramics International 2025年第13期51卷 17226-17237页

作者： Messai, Bahia Makhloufi, Rachid Keziz, Ahcen Benmakhlouf, Aymen Nouiri, Mourad Mohaymen Taha, Taha Abdel University of Biskra P.O. Box 145 Biskra07000 Algeria Department of Physics Physics and Chemistry of Materials Laboratory University Pole M'sila28000 Algeria Faculty of Science of Gabes University of Gabes Gabes6079 Tunisia Physics and Engineering Mathematics Department Faculty of Electronic Engineering Menoufia University Menouf32952 Egypt

This research explores the synthesis and electrical characterization of SrF2-modified lead zirconate titanate Pb1-xSrx[(Zr0.43Ti0.52) (Al0.5Sb0.5)0.05]O3-xF2x, referred to as PZT-SASF ceramics. The synthesis was completed using solid-state methods, focusing on properties near the morphotropic phase boundary (MPB). The samples were analyzed using various laboratory techniques. Phase formation was studied using powder X-ray diffraction (XRD). This analysis revealed the coexistence of tetragonal and rhombohedral phases. Microstructural examination with scanning electron microscopy (SEM) showed a non-uniform distribution of large grains and some micro-sized pores. Impedance and electric modulus measurements were performed over a frequency range of 0.1 kHz–1 MHz and temperatures from 300 to 700 K. The results demonstrated the influence of grain structure on capacitive and resistive properties. The Nyquist plot revealed how grains contribute to resistance and capacitance. An appropriate electrical circuit was used for equivalent circuit analysis. Fitting procedures were implemented across all temperatures to determine grain resistance and capacitance values. Incorporating Sr2+ ions at the Pb-site and F− ions at the O-site enhanced the dielectric constant at higher temperatures. Finally, the activation energy of the synthesized ceramics increased from 0.7 eV at x = 0.0 to 1.12 eV at x = 0.08 and then decreased to 0.97 eV at x = 0.1. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Activation energy

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