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中国物理B（英文版）
中国物理B（英文版）

欧阳钟灿

月刊

1674-1056

010-82649026 82649519

100080

北京603信箱

中国物理B（英文版）/Journal Chinese Physics　BCSCDCSTPCD北大核心EISCI
查看更多>>该刊与《物理学报》是中国物理学会主办的物理学英文和中文的综合性国际学术月刊。刊登物理学科领域中，国内外未曾公开发表的具有创新性的科学研究最新成果。内容包括物理学各领域的理论、实验技术及应用。两刊内容不重复。两刊以论文水平高、创新性强，发表速度快的特点，受到国内外物理学工作者的好评和关注。被国际著名的SCI等10种以上检索系统收录。曾多次被评为中国科学院优秀期刊一等奖，1999，2003，2005年荣获第一、第二和第三届国家期刊奖，2001年被国家新闻出版总署评为“中国期刊方阵”中的双高（高知名度、高学术水平）期刊。2001，2002，2003年两刊都评为百种中国杰出期刊。
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    Distance-dependent magnetization modulation induced by inter-superatomic interactions in Cr-doped Au6Te12Se8 dimers

    官雨柔刘南舒王聪庞斐...
    457-465页
    查看更多>>摘要：Individual superatoms are assembled into more complicated nanostructures to diversify their physical properties.Magnetism of assembled superatoms remains,however,ambiguous,particularly in terms of its distance dependence.Here,we report density functional theory calculations on the distance-dependent magnetism of transition metal embed-ded Au6Te8Se12(ATS)superatomic dimers.Among the four considered transition metals,which include V,Cr,Mn and Fe,the Cr-embedded Au6Te12Se8(Cr@ATS)is identified as the most suitable for exploring the inter-superatomic distance-dependent magnetism.We thus focused on Cr@ATS superatomic dimers and found an inter-superatomic magnetization-distance oscillation where three transitions occur for magnetic ordering and/or anisotropy at different inter-superatomic distances.As the inter-superatomic distance elongates,a ferromagnetism(FM)-to-antiferromagnetic(AFM)transition and a sequential AFM-to-FM transition occur,ascribed to competitions among Pauli repulsion and kinetic-energy-gains in formed inter-superatomic Cr-Au-Au-Cr covalent bonds and Te-Te quasi-covalent bonds.For the third transition,in-plane electronic hybridization contributes to the stabilization of the AFM configuration.This work unveils two mechanisms for tuning magnetism through non-covalent interactions and provides a strategy for manipulating magnetism in superatomic assemblies.
      原文链接:
    • 万方数据
    • 维普

    Valley modulation and topological phase transition in staggered kagome ferromagnets

    邢玉恒邱文娟吴新星谭悦...
    466-472页
    查看更多>>摘要：Owing to their charge-free property,magnons are highly promising for achieving dissipationless transport without Joule heating,and are thus potentially applicable to energy-efficient devices.Here,we investigate valley magnons and associated valley modulations in a kagome ferromagnetic lattice with staggered exchange interaction and Dzyaloshinskii-Moriya interaction.The staggered exchange interaction breaks the spatial inversion symmetry,leading to a valley magnon Hall effect.With nonzero Dzyaloshinskii-Moriya interaction in a staggered kagome lattice,the magnon Hall effect can be observed from only one valley.Moreover,reversing the Dzyaloshinskii-Moriya interaction(D →-D)and exchanging J1 and J2(J1 ↔ J2)can also regulate the position of the unequal valleys.With increasing Dzyaloshinskii-Moriya interaction,a series of topological phase transitions appear when two bands come to touch and split at the valleys.The valley Hall effect and topological phase transitions observed in kagome magnon lattices can be realized in thin films of insulating ferromagnets such as Lu2V2O7,and will extend the basis for magnonics applications in the future.
      原文链接:
    • 万方数据
    • 维普

    Cu-doped nanocomposite Pr2Fe14B/α-Fe ribbons with high(BH)max

    Mehran Khan AlamShahzab Raza高成勇韩广兵...
    473-481页
    查看更多>>摘要：The melt-spun ribbons of nominal composition Pr9Fe84.2-xB6.2P0.3Zr0.3Cux(x=0,0.5,1,2)were prepared at wheel speeds of 21 m·s-1,27 m·s-1,30 m·s-1,and 33 m·s-1.The XRD patterns show that as the wheel speed increases,the crystallinity of the 2∶14∶1 hard phase decreases,while that of the α-Fe soft phase increases.The(BH)max,remanence,and coercivity are improved from 63 kJ·m-3,0.85 T,and 515 kA·m-1 for the Cu-free ribbons to 171 kJ·m-3,1.08 T,and 684 kA·m-1 with x=0.5.The high squareness ratio of Jr/Js～0.82 at 0.5 at.％Cu(27 m·s-1)indicates strong exchange coupling due to small grain sizes of 15 nm and 30 nm for soft and hard magnetic phases,respectively.The SEM images revealed smooth morphology and uniform element distribution at 0.5 at.％Cu(27 m.s-1),contributing to the high magnetic properties.The low recoil permeability(μrec)value of 5.466 × 10-4 T/kA·m-1 to 1.970 × 10-4 T/kA·m-1 confirms the strong exchange coupling with x=0.5(27 m·s-1).The initial magnetization curves show that the coercivity mechanism of the Cu-free alloy evolves from the nucleation of the reverse domain to the domain wall pinning as the wheel speed increases,resulting in a high coercivity value of 818 kA·m-1(33 m·s-1).Conversely,for the Cu-added alloy,the coercivity mechanism changes from pinning to the nucleation of the reverse domain from low to high wheel speed.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Optical properties of La2O3 and HfO2 for radiative cooling via multiscale simulations

    王礼浩杨旺霖王忠阳李鸿超...
    482-494页
    查看更多>>摘要：Radiative cooling materials have gained prominence as a zero-energy solution for mitigating global warming.How-ever,a comprehensive understanding of the atomic-scale optical properties and macroscopic optical performance of radia-tive cooling materials remains elusive,limiting insight into the underlying physics of their optical response and cooling efficacy.La2O3 and HfO2,which represent rare earth and third/fourth subgroup inorganic oxides,respectively,show promise for radiative cooling applications.In this study,we used multiscale simulations to investigate the optical properties of La2O3 and HfO2 across a broad spectrum.First-principles calculations revealed their dielectric functions and intrinsic refractive indices,and the results indicated that the slightly smaller bandgap of La2O3 compared to HfO2 induces a higher refractive index in the solar band.Additionally,three-phonon scattering was found to provide more accurate infrared optical properties than two-phonon scattering,which enhanced the emissivity in the sky window.Monte Carlo simulations were also used to determine the macroscopic optical properties of La2O3 and HfO2 coatings.Based on the simulated results,we identified that the particle size and particle volume fraction play a dominant role in the optical properties.Our findings underscore the potential of La2O3 and HfO2 nanocomposites for environment-friendly cooling and offer a new approach for high-throughput screening of optical materials through multiscale simulations.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Enhanced near-field radiative heat transfer between borophene sheets on different substrates

    韩小洋范春珍
    495-501页
    查看更多>>摘要：Near-field radiative heat transfer(NFRHT)has the potential to exceed the blackbody limit by several orders of mag-nitude,offering significant opportunities for energy harvesting.In this study,we have examined the NFRHT between two borophene sheets through the calculation of heat transfer coefficient(HTC).Due to the tunneling of evanescent waves,borophene sheet allows for enhanced heat flux and adjustable NFRHT by varying its electron density and electron relax-ation time.Additionally,the near field coupling is further examined when the borophene is deposited on dielectric or lossy substrates.The maximum HTC is closely related to the real part of the dielectric substrate.As a case study,the HTCs on the lossy substrate of MoO3,ZnSe,and SiC are calculated for comparisons.Our results indicate that MoO3 is the optimal substrate to get the enhanced energy transfer coefficient.It results in a remarkable value of 1737 times higher than the blackbody limit owing to the enhanced photon tunneling probability.Thus,our study reveals the effect of substrate on the HTC between borophene sheets and provides a theoretical guidance for the design of near-field thermal radiation devices.
      原文链接:
    • 万方数据
    • 维普

    Screening A-site ordered quadruple perovskites for alkaline hydrogen evolution reaction via unifying electronic configuration descriptor

    孙宁李文博秦杨郑智钏...
    502-511页
    查看更多>>摘要：Dynamic adsorption processes of reaction intermediates for alkaline hydrogen evolution(HER)catalysts are still con-fusing to understand.Here,we report a series of A-site ordered quadruple perovskite ruthenium-based electrocatalysts ACu3Ru4O12(A=Na,Ca,Nd,and La),with the target sample SrCu3Ru4O12 exhibiting a very low overpotential(46 mV@10 mA·cm-2)and excellent catalytic stability with little decays after 48-h durability test.Precise tuning A-site cations can change the average valence state of Cu and Ru,thus the plot of HER activity versus the average Ru valence number shows a volcano-type relationship.Density functional theory indicates that the Ru 4d orbitals of SrCu3Ru4O12 possesses the most suitable d-band center position among the five samples,which might be the key parameter to determine the cat-alytic performance.Our work provides further insight into the discovering advanced,efficient hydrogen evolution catalysts through designing precise descriptor.
      原文链接:
    • 万方数据
    • 维普

    Effects of TMIn flow rate during quantum barrier growth on multi-quantum well material properties and device performance of GaN-based laser diodes

    陈振宇赵德刚梁锋刘宗顺...
    512-522页
    查看更多>>摘要：Multidimensional influences of indium composition in barrier layers on GaN-based blue laser diodes(LDs)are dis-cussed from both material quality and device physics perspectives.LDs with higher indium content in the barriers demon-strate a notably lower threshold current and shorter lasing wavelength compared to those with lower indium content.Our experiments reveal that higher indium content in the barrier layers can partially reduce indium composition in the quantum wells,a novel discovery.Employing higher indium content barrier layers leads to improved luminescence properties of the MQW region.Detailed analysis reveals that this improvement can be attributed to better homogeneity in the indium com-position of the well layers along the epitaxy direction.InGaN barrier layers suppress the lattice mismatch between barrier and well layers,thus mitigating the indium content pulling effect in the well layers.In supplement to experimental analysis,theoretical computations are performed,showing that InGaN barrier structures can effectively enhance carrier recombi-nation efficiency and optical confinement of LD structure,thus improving the output efficiency of GaN-based blue LDs.Combining these theoretical insights with our experimental data,we propose that higher indium content barriers effectively enhance carrier recombination efficiency and indium content homogeneity in quantum well layers,thereby improving the output performance of GaN-based blue LDs.
      原文链接:
    • 万方数据
    • 维普

    Quantum-mechanical understanding on structure dependence of image potentials of single-walled boron nitride nanotubes

    张煜张芷蔓王伟良张绍林...
    523-532页
    查看更多>>摘要：The recent discovery of field emission devices based on one-dimensional nanostructures has attracted much interest in emerging applications on next-generation flat panel displays,molecule-based sensors,and so forth.To achieve a compre-hensive understanding of surface potentials at the nano-emitters during the tunneling process,in this study we systematically investigated the image potentials of single-walled boron nitride nanotubes with different edges,diameters and lengths in the frame of a composite first-principles calculation.The image potentials of zigzag single-walled boron nitride nanotubes are found to be dependent on the non-equivalent sides.Only the image potentials of isolated armchair single-walled boron nitride nanotube can be well fitted with the image potential of an ideal metal sphere of a size comparable to the tube diame-ter.On the contrary,the image potentials of zigzag and grounded armchair single-walled boron nitride nanotubes exhibit a strong length-dependence characteristic and are significantly different from that of an ideal metal sphere,which originates from the significant axial symmetry breaking of induced charge at the tip for the long tube.The correlation between the testing electron and electronic structure of single-walled boron nitride nanotube has also been discussed.
      原文链接:
    • 万方数据
    • 维普

    A macro model of spin-transfer torque magnetic tunnel junction

    陈明博李琨琨杨晓蕾彭雪...
    533-539页
    查看更多>>摘要：The precise compact modeling of magnetic devices is pivotal for the integrated design of spin-transfer torque magnetic tunnel junction(STT-MTJ)in conjunction with CMOS circuitry.This work presents a macro model for an STT-MTJ which is compatible with SPICE simulation platforms.The model accurately replicates the electrical performance of the MTJ,encompassing the resistance-voltage characteristics and the pulse-width-dependent state switching behavior,and is validated with various experimental data.Additionally,the impact of process variations,particularly those affecting the MTJ diameter and barrier thickness is investigated and summarized in a corner model.Monte Carlo simulations demonstrate that our adaptable and streamlined model can be efficiently incorporated into the design of integrated circuits.
      原文链接:
    • 万方数据
    • 维普

    Back-side stress to ease p-MOSFET degradation on e-MRAM chips

    于志猛杨晓蕾赵晓楠李艳杰...
    540-545页
    查看更多>>摘要：The magnetoresistive random access memory process makes a great contribution to threshold voltage deterioration of metal-oxide-silicon field-effect transistors,especially on p-type devices.Herein,a method was proposed to reduce the threshold voltage degradation by utilizing back-side stress.Through the deposition of tensile material on the back side,positive charges generated by silicon-hydrogen bond breakage were inhibited,resulting in a potential reduction in threshold voltage shift by up to 20％.In addition,it was found that the method could only relieve silicon-hydrogen bond breakage physically,thus failing to provide a complete cure.However,it holds significant potential for applications where additional thermal budget is undesired.Furthermore,it was also concluded that the method used in this work is irreversible,with its effect sustained to the chip package phase,and it ensures competitive reliability of the resulting magnetic tunnel junction devices.
      原文链接:
    • 万方数据
    • 维普