Results in Physics最新文献

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Corrigendum to “Investigation of structural and physical properties of Eu3+ ions substituted Ni0.4Cu0.2Zn0.4Fe2O4 spinel ferrite nanoparticles prepared via sonochemical approach” [Res. Phys. 17 (2020) 103061] 通过超声化学方法制备的 Eu3+ 离子取代 Ni0.4Cu0.2Zn0.4Fe2O4 尖晶石铁氧体纳米粒子的结构和物理性质研究》[Res. Phys. 17 (2020) 103061]勘误表

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-10-01 DOI: 10.1016/j.rinp.2024.107981

引用次数: 0

Enhancement of high-frequency harmonics in resonators using multilayered structures with polarity-inverted layers 利用具有极性反转层的多层结构增强谐振器中的高频谐波

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-10-01 DOI: 10.1016/j.rinp.2024.107998

Periodically Poled Piezoelectric Film (P3F) stacks have recently been reported as a promising platform for next-generation radio-frequency acoustic filters that extend into cm- and mm-wave bands. By demonstrating the potential for developing high-performance acoustic devices with frequencies up to 20 GHz, P3F structures based on lithium niobate (LiNbO3) films have opened up new possibilities. In this study, the influence of key parameters such as the number of layers, crystal orientation, duty factor, and variation in thicknesses between the layers on the efficiency of the n-th harmonic excitation and spurious modes was examined. To enhance higher-order harmonics, which are suppressed in P3F structures, a novel multilayered stack with Aperiodically Polarized Piezoelectric Films (APPF) is proposed. Optimizing the ratio between layer thicknesses can enhance higher-order harmonics. An optimization principle is described and illustrated by examples of three-layered APPF structures optimized for the generation of antisymmetric Lamb wave harmonics A3-A17, with electromechanical coupling continuously decreasing with frequency. High-frequency modes excited in APPF structures fill the gaps in frequencies and electromechanical coupling coefficients between the modes generated in P3F stacks and can provide greater diversity of device performance.

最近有报道称，周期性极化压电薄膜（P3F）叠层是下一代射频声学滤波器的理想平台，可扩展到厘米波和毫米波频段。基于铌酸锂（LiNbO3）薄膜的 P3F 结构展示了开发频率高达 20 GHz 的高性能声学设备的潜力，从而开辟了新的可能性。本研究考察了层数、晶体取向、占空比和层间厚度变化等关键参数对 n 次谐波激发效率和杂散模式的影响。为了增强在 P3F 结构中被抑制的高阶谐波，提出了一种带有非周期极化压电薄膜 (APPF) 的新型多层叠层。优化层厚之间的比例可以增强高阶谐波。本文描述了优化原理，并以三层 APPF 结构为例进行了说明，这些结构经过优化，可产生 A3-A17 非对称 Lamb 波谐波，机电耦合随频率不断降低。在 APPF 结构中激发的高频模式填补了 P3F 叠层中产生的模式之间在频率和机电耦合系数上的差距，可提供更多样化的器件性能。

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引用次数: 0

Lie symmetry analysis, traveling wave solutions and conservation laws of a Zabolotskaya-Khokholov dynamical model in plasma physics 等离子体物理学中扎博洛茨卡娅-霍霍洛夫动力学模型的列对称分析、行波解和守恒定律

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-26 DOI: 10.1016/j.rinp.2024.107986

This article analyzes the analytic and solitary wave solutions of the one-dimensional Zabolotskaya-Khokholov (ZK) dynamical model which provides information about the propagation of sound beam or confined wave beam in nonlinear media and studies of beam deformation. By the Lie symmetry analysis method, we acquire the vector fields, commutation relations, optimal system, reduction, and analytic solutions to the specified equation by exerting the Lie group method. Moreover, the solitary wave solutions of the ZK model are procured by exerting the new auxiliary equation method (NAEM). The behavior of the acquired outcomes for several cases is exhibited graphically through two and three-dimensional dynamical wave profiles. Furthermore, the conservation laws of the ZK model are acquired by Ibragimov’s new conservation theorem.

本文分析了一维 Zabolotskaya-Khokholov（ZK）动力学模型的解析解和孤波解，该模型提供了声束或约束波束在非线性介质中传播的信息，并研究了声束的变形。利用李对称分析方法，我们获得了指定方程的矢量场、换向关系、最优系统、还原和解析解。此外，还利用新辅助方程法（NAEM）获得了 ZK 模型的孤波解。通过二维和三维动态波剖面图展示了几种情况下所获结果的行为。此外，ZK 模型的守恒定律是通过伊布拉吉莫夫新守恒定理获得的。

引用次数: 0

Recent advances in PVP-assisted thermal treatment: Impact on nanostructure properties, potential applications, challenges, and future perspectives PVP 辅助热处理的最新进展：对纳米结构特性的影响、潜在应用、挑战和未来展望

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-24 DOI: 10.1016/j.rinp.2024.107990

Nanotechnology has garnered significant attention for its wide-ranging applications in biomedicine, energy, and environmental science. The synthesis of nanomaterials with specific properties is crucial for advancing these fields. Among various methods, thermal treatment has emerged as a promising technique for producing diverse nanostructures. However, thermal treatment alone often leads to larger particle sizes and poor uniformity, limiting the practical applications of the resulting nanomaterials. Incorporating polyvinylpyrrolidone (PVP) as a capping agent addresses these challenges by reducing particle size and enhancing uniformity. Optimizing parameters such as PVP concentration, molecular weight, temperature, and precursor ratios is key to improving the performance of the PVP-assisted thermal treatment method. This paper reviews recent progress in synthesizing nanostructures using PVP-assisted thermal treatment, including key characterization techniques. It also examines the applications of these nanostructures in fields such as biomedicine, energy, and environmental science. The review identifies challenges in the synthesis and characterization process, while also outlining potential future directions for enhancing this method. The insights provided will be valuable to researchers working in nanotechnology and related disciplines.

纳米技术因其在生物医学、能源和环境科学领域的广泛应用而备受关注。合成具有特定性能的纳米材料对于推动这些领域的发展至关重要。在各种方法中，热处理已成为生产各种纳米结构的一种有前途的技术。然而，单纯的热处理往往会导致颗粒尺寸变大、均匀性变差，从而限制了所制备纳米材料的实际应用。加入聚乙烯吡咯烷酮（PVP）作为封端剂可以减小颗粒尺寸并提高均匀性，从而解决这些难题。优化 PVP 浓度、分子量、温度和前驱体比例等参数是提高 PVP 辅助热处理方法性能的关键。本文回顾了利用 PVP 辅助热处理合成纳米结构的最新进展，包括关键的表征技术。本文还探讨了这些纳米结构在生物医学、能源和环境科学等领域的应用。综述指出了合成和表征过程中面临的挑战，同时也概述了未来改进这种方法的潜在方向。所提供的见解对纳米技术和相关学科的研究人员很有价值。

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引用次数: 0

Probing photonic spin Hall effect with Fizeau drag in graphene 利用石墨烯中的菲佐阻力探测光子自旋霍尔效应

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-24 DOI: 10.1016/j.rinp.2024.107987

Graphene is of particular interest in optoelectronics due to its remarkable transport properties. We analyze the photonic spin Hall effect (PSHE) of a light beam reflected from a layered structure of graphene in its current-carrying state. The relativistic effects arising due to the motion of massless Dirac electrons in graphene greatly influence the transverse displacements of light induced by PSHE. The mentioned effect is studied with different drifting speeds of the charged particles in graphene as well as different thicknesses of the graphene sheet. The substrate on which the graphene is deposited is also shown to play a vital role in manipulating this relativistic PSHE. This study provides a platform for efficient light-matter interaction in which the medium is a current-carrying graphene channel.

石墨烯因其卓越的传输特性而在光电子学领域备受关注。我们分析了石墨烯层状结构在载流状态下反射的光束的光子自旋霍尔效应（PSHE）。石墨烯中无质量狄拉克电子的运动所产生的相对论效应极大地影响了 PSHE 所诱导的光的横向位移。上述效应是在石墨烯中带电粒子漂移速度不同以及石墨烯薄片厚度不同的情况下进行研究的。研究还表明，沉积石墨烯的基底在操纵这种相对论 PSHE 方面起着至关重要的作用。这项研究为高效的光物质相互作用提供了一个平台，其中的介质是载流石墨烯通道。

引用次数: 0

Nanocrystallization and precipitation behavior evolution of AZ80 magnesium alloy during multi-directional compression 多向压缩过程中 AZ80 镁合金的纳米结晶和沉淀行为演变

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-24 DOI: 10.1016/j.rinp.2024.107992

In response to the growing demand for high-performance magnesium alloys in the aerospace and transportation industries, researchers conducted a study on the AZ80 magnesium alloy. The primary objective was to achieve a nanocrystalline structure in the alloy through severe plastic deformation using low-strain multi-directional compression at room temperature. Subsequently, an aging treatment was performed to induce the transformation of the structure into a stable state. The study aimed to investigate the morphology and mode of the second phase precipitation in the magnesium alloy after undergoing severe plastic deformation. The research findings revealed that the application of multi-directional and multi-pass compression during room temperature deformation of the magnesium alloy effectively prevented instability and fracture. Moreover, this process facilitated the accumulation of larger true strain. As the number of compression passes increased, deformation twins became increasingly denser, particularly in the intersecting areas. Consequently, ultrafine high-angle grain structures were preferentially formed in these regions. Furthermore, the number of fine-grained areas gradually increased with each deformation pass. After ΣΔε 5.12, the grain size was refined to a range of 100–200 nm. Additionally, the aging treatment following severe plastic deformation brought about a significant change in the traditional lamellar precipitation mode of the second phase Mg₁₇Al₁₂ in the magnesium alloy. Instead, spherical precipitation occurred.

为满足航空航天和运输行业对高性能镁合金日益增长的需求，研究人员对 AZ80 镁合金进行了研究。研究的主要目的是在室温下利用低应变多向压缩，通过剧烈塑性变形在合金中形成纳米晶结构。随后，进行老化处理，促使结构转变为稳定状态。该研究旨在探究镁合金在经历剧烈塑性变形后第二相析出的形态和模式。研究结果表明，在镁合金室温变形过程中施加多方向和多通道压缩，可有效防止不稳定和断裂。此外，这一过程还有助于积累更大的真实应变。随着压缩次数的增加，变形孪晶变得越来越致密，尤其是在相交区域。因此，超细高角度晶粒结构优先在这些区域形成。此外，细晶粒区域的数量随着每次变形次数的增加而逐渐增加。在 ΣΔε 5.12 之后，晶粒尺寸细化到 100-200 nm。此外，严重塑性变形后的时效处理使镁合金中第二相 Mg17Al12 的传统片状析出模式发生了显著变化。取而代之的是球形析出。

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引用次数: 0

Dispersion-free characterization of terahertz slab–waveguide modal confinement based on a metal Bragg grating structure 基于金属布拉格光栅结构的太赫兹平板波导模态约束无色散特性分析

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-23 DOI: 10.1016/j.rinp.2024.107988

Photonic waveguide structures that use periodic metal grooves and periodically perforated metal slits (PPMSs) can laterally confine Sommerfeld and Zenneck surface waves of metals with the electric field accumulation among metal interspaces in the terahertz (THz) region, instead of the total internal reflection principle of dielectric slab media. For the efficiency enhancements of THz-wave coupling and slab–waveguide confinement, specific integrators with high refractive indices or specified for input angles of transverse magnetic polarized waves, such as prisms, metal blades, and waveguides, are requested to excite spoof surface plasmons in the THz region. However, the integrator-assembled slab–waveguides encounter challenges of THz pulse-wave communication in compact and low-distortion systems. A resonant waveguide grating structure based on PPMSs is experimentally demonstrated to confine THz lateral waves from the plane-wave radiation in free space. The open frame and periodic metal cavities of PPMSs can work as a slab–waveguide to transmit structural confined waveguide modes with forwarding evanescent waves of Fabry–Pérot resonance. For 0.1–1 THz waves, the short wavelengths that are both less than half the metal slit width and 3.75 times the metal thickness can lead to zero dispersion and the highest confinement factor in a slab–waveguide for PPMS-confined THz waves. This behavior is opposite to the high structural dispersion in confined THz waves of surface plasmonic devices.

使用周期性金属沟槽和周期性穿孔金属狭缝（PPMS）的光子波导结构，可以在太赫兹（THz）区域利用金属间隙间的电场积累横向约束金属的索默费尔德和齐内克表面波，而不是介质板状介质的全内反射原理。为了提高太赫兹波耦合和板-波导约束的效率，需要具有高折射率或指定横向磁偏振波输入角的特定积分器，如棱镜、金属叶片和波导，以激发太赫兹区域的欺骗性表面质子。然而，积分器组装的板状波导在紧凑和低失真系统中进行太赫兹脉冲波通信时遇到了挑战。实验证明，基于 PPMS 的谐振波导光栅结构可以限制自由空间平面波辐射中的太赫兹横向波。PPMS 的开放式框架和周期性金属空腔可作为板状波导，传输具有法布里-佩罗共振前向蒸发波的结构约束波导模式。对于 0.1-1 太赫兹波，小于金属狭缝宽度一半和金属厚度 3.75 倍的短波长可导致零色散，并使 PPMS 限制的太赫兹波在板状波导中具有最高的限制因子。这种行为与表面等离子器件在约束太赫兹波中的高结构色散相反。

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引用次数: 0

Phase diagram of the Hubbard chain with symmetric density-dependent hopping 具有对称密度跳变的哈伯德链相图

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-23 DOI: 10.1016/j.rinp.2024.107983

By the bosonization and renormalization-group schemes, a half-filled Hubbard chain with density-dependent hopping is investigated at weak coupling. The model involved has an electron–hole symmetry and an SO(4) symmetry. The phase diagram consists of three different phases divided by a charge transition at on-site repulsion

U = U_{c}

and a spin transition at

U = U_{s}

, with

U_{s} = - U_{c} = \frac{16}{π} (t_{c} - 1)

, including a Mott insulator with the SDW correlation, a dimerized insulator with the BCDW correlation, and a Luttinger metal with the coexisting TS and BSDW correlations. The effective three-body repulsion (

t_{c} - 1 > 0

) and attraction (

t_{c} - 1 < 0

) induce the dimerized and metallic phases, respectively.

通过玻色子化和重正化群方案，研究了在弱耦合下具有密度依赖性跳变的半填充哈伯德链。该模型具有电子-空穴对称性和 SO(4) 对称性。相图由三个不同的相组成，分别是现场斥力 U=Uc 时的电荷转换和 U=Us 时的自旋转换（Us=-Uc=16π(tc-1)），包括具有 SDW 相关性的莫特绝缘体、具有 BCDW 相关性的二聚绝缘体和具有共存 TS 和 BSDW 相关性的卢廷格金属。有效的三体斥力（tc-1>0）和吸引力（tc-1<0）分别诱导出二聚体和金属相。

引用次数: 0

Facile co-precipitation synthesis of nano-molybdenum-doped BaO nanoparticles and their physical characterization 纳米钼掺杂 BaO 纳米粒子的简便共沉淀合成及其物理表征

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-19 DOI: 10.1016/j.rinp.2024.107979

Alkaline metal oxides have received significant attention recently due to their abundance, inherent conductivity, optical absorption, and thermal stability. Here, a straightforward co-precipitation method was employed to obtain both undoped BaO and Mo-doped BaO nanoparticles. Various techniques were used to characterize the synthesized nanoparticles’ structural, Raman spectral, optical, thermal, and electrical properties. X-ray diffraction (XRD) results revealed that Mo was successfully doped into tetragonal nanocrystalline BaO. The W-H plot showed that as Mo doping increases from 2 % to 6 %, the crystallite size grows while the lattice structure remains well-ordered with even strain distribution. Scanning electron microscopy (SEM) was used to examine its surface features. The purity and crystalline character of the samples were further confirmed via Raman spectroscopy, which shows that the peak intensity of the spectra increases with the increase of particle size owing to the rise in the force constant. UV spectroscopy was used to observe the energy band gap, which is found to decrease from 4.2 eV to 3.8 eV, and then it drops to 3.4 eV as the Mo content increases. This is reasonable because of the size-dependent attraction between metallic ions and conduction electrons. PL spectra concluded that Mo doping leads to the enhancement of the optical characteristics of BaO. Adding Mo to BaO also modifies the material’s thermal properties, potentially affecting its suitability for applications that require thermal durability. This finding exhibits that even slight doping of Mo⁴⁺ into BaO can significantly impact their structural, thermal, optical, and electrical characteristics. It enriches the existing body of knowledge of BaO nanoparticles and lays the foundation for its future research.

碱性金属氧化物因其丰富的资源、固有的导电性、光吸收性和热稳定性而受到广泛关注。本文采用直接共沉淀法获得了未掺杂的 BaO 和掺杂 Mo 的 BaO 纳米粒子。研究人员采用多种技术对合成的纳米粒子的结构、拉曼光谱、光学、热学和电学特性进行了表征。X 射线衍射 (XRD) 结果表明，钼成功地掺杂到了四方纳米晶 BaO 中。W-H 图显示，随着钼掺杂量从 2% 增加到 6%，晶粒尺寸不断增大，而晶格结构仍然井然有序，应变分布均匀。扫描电子显微镜（SEM）用于检查其表面特征。拉曼光谱进一步证实了样品的纯度和结晶特性。拉曼光谱显示，由于力常数的增加，光谱的峰值强度随着粒度的增加而增加。紫外光谱法用于观察能带间隙，发现随着钼含量的增加，能带间隙从 4.2 eV 下降到 3.8 eV，然后又下降到 3.4 eV。这是合理的，因为金属离子和传导电子之间的吸引力与尺寸有关。聚光光谱得出的结论是，掺杂钼可增强 BaO 的光学特性。在 BaO 中添加钼还会改变材料的热特性，从而可能影响其在需要热耐久性的应用中的适用性。这一发现表明，即使在 BaO 中轻微掺入 Mo4+，也会对其结构、热学、光学和电学特性产生重大影响。它丰富了有关 BaO 纳米粒子的现有知识体系，并为今后的研究奠定了基础。

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引用次数: 0

Ultra-broadband Photodetectors Based on Formamidinium Lead Iodide Quantum Dots 基于甲脒碘化铅量子点的超宽带光电探测器

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2024-09-19 DOI: 10.1016/j.rinp.2024.107964

Near-infrared photodetectors were fabricated by incorporating formamidinium lead iodide (FAPbI₃) quantum dots (QDs) as the light-harvesting layer. Through systematic optimization of the device architecture, high device performance was achieved by utilizing PCBM as the electron transport material and a 50 nm-thick TAPC film as the hole transport layer. The energy level alignment between PCBM and the FAPbI₃ QDs enabled efficient exciton dissociation and hole blocking, while the optimized TAPC thickness decrease current leakage pathways. The resulting photodetectors exhibited an impressive external quantum efficiency of 59.56 % at 750 nm, along with a high specific detectivity of 2.63 x 10¹¹ Jones. A broadband photoresponse from 300–900 nm was observed, as well as a fast temporal response with 30.58/31.26 μs rise/fall times. A substantial linear dynamic range of 61.5 dB was achieved under 780 nm illumination. Furthermore, the low dark current densities facilitated by the judiciously selected materials and thicknesses contributed to the excellent overall device performance. The device performance of the PCBM/FAPbI₃ QDs/TAPC system demonstrate its promising potential for near-infrared optoelectronic applications requiring high sensitivity, speed, and broad spectral response, opening up opportunities for further advances in photodetection as well as other relevant device technologies.

通过将甲脒碘化铅（FAPbI3）量子点（QDs）作为光收集层，制备出了近红外光电探测器。通过对器件结构进行系统优化，利用 PCBM 作为电子传输材料和 50 纳米厚的 TAPC 薄膜作为空穴传输层，实现了高器件性能。PCBM 和 FAPbI3 QD 之间的能级对准实现了高效的激子解离和空穴阻断，而优化的 TAPC 厚度则减少了电流泄漏途径。由此产生的光电探测器在 750 纳米波长下表现出 59.56% 的惊人外部量子效率，以及 2.63 x 1011 琼斯的高比探测率。在 300-900 纳米波长范围内观察到宽带光响应，以及 30.58/31.26 μs 上升/下降时间的快速时间响应。在 780 纳米光照下，实现了 61.5 分贝的大幅线性动态范围。此外，通过合理选择材料和厚度而实现的低暗电流密度也有助于实现出色的整体器件性能。PCBM/FAPbI3 QDs/TAPC 系统的器件性能证明了其在要求高灵敏度、高速度和宽光谱响应的近红外光电应用中的巨大潜力，为进一步推动光电探测及其他相关器件技术的发展提供了机遇。

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