Chinese Journal of Physics最新文献

英文中文

The evolution of dissipative soliton resonance from noise-like pulse via the saturable absorption to reverse saturable absorption transition within covalent organic framework saturable absorbers 在共价有机框架可饱和吸收体中，耗散孤子共振通过可饱和吸收到反向可饱和吸收的转变，从类似噪声的脉冲演化而来

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.cjph.2024.10.028

Hsuan-Sen Wang , Ahmed F.M. EL-Mahdy , Shiao-Wei Kuo , Wen-Hsuan Kuan , Kuei-Huei Lin , Gong-Ru Lin , Chao-Kuei Lee

In this study, for the first time, the dynamic evolution from noise-like pulses (NLPs) to dissipative soliton resonance (DSR) in an erbium-doped fiber laser system was observed and investigated by using a porphyrin/pyrene-linked covalent organic framework (COF) saturable absorber. Experimentally, by adjusting the pump power, the laser operation state was observed to be with a transition from NLPs to DSR. In addition, the correlation between the transition from NLPs to DSR and the variation from saturable absorption to reverse saturable absorption (RSA) within the COF material was analyzed, leading to the variation of absorption with increasing pump power playing a key role in this process. The competition mechanism between the spectral filtering effect and RSA was proposed, and the results observed agree quite well with the proposed model. This research not only reveals new features of pulse dynamics in fiber lasers but also highlights the potential of crystalline porous materials in nonlinear optical applications. It provides an important experimental foundation for further exploration of novel two-dimensional materials in the field of ultrafast optics.

本研究利用卟啉/芘连接的共价有机框架（COF）可饱和吸收体，首次观察和研究了掺铒光纤激光器系统从类噪声脉冲（NLP）到耗散孤子共振（DSR）的动态演化过程。实验结果表明，通过调节泵浦功率，激光器的工作状态可以从 NLPs 过渡到 DSR。此外，还分析了从 NLPs 到 DSR 的转变与 COF 材料内部从可饱和吸收到反向可饱和吸收（RSA）的变化之间的相关性，从而得出吸收随泵浦功率增加而变化在这一过程中起着关键作用。提出了光谱滤波效应与 RSA 之间的竞争机制，观察到的结果与提出的模型相当吻合。这项研究不仅揭示了光纤激光器中脉冲动力学的新特征，还凸显了晶体多孔材料在非线性光学应用中的潜力。它为进一步探索新型二维材料在超快光学领域的应用提供了重要的实验基础。

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引用次数: 0

Manipulating dwell time and spin polarization via δ-doping for electrons in spin-orbit-coupling modulated magnetic nanostructure 通过掺杂δ操纵自旋轨道耦合调制磁性纳米结构中电子的停留时间和自旋极化

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-09 DOI: 10.1016/j.cjph.2024.11.004

Li Wen, Mao-Wang Lu, Jia-Li Chen, Sai-Yan Chen, Xue-Li Cao, An-Qi Zhang

With the help of atomic-layer doping technology, we theoretically explore how to use a δ-potential to manipulate a temporal electron-spin splitter (TESS), which is based on a spin-orbit-coupling (SOC) modulated magnetic nanostructure. Due to the SOC, the dwell time still depends on electron spins even if a δ-doping is embedded inside the TESS. Moreover, both the magnitude and sign of spin polarization ratio can be controlled by tuning the weight or position of the δ-doping. Therefore, a structurally manipulable TESS device can be obtained for semiconductor spintronic device applications.

在原子层掺杂技术的帮助下，我们从理论上探索了如何利用δ电位来操纵基于自旋轨道耦合（SOC）调制磁性纳米结构的时空电子自旋分离器（TESS）。由于存在自旋轨道耦合，即使在 TESS 内嵌入了 δ 掺杂，停留时间仍然取决于电子自旋。此外，自旋极化率的大小和符号都可以通过调整δ掺杂的重量或位置来控制。因此，可以获得一种结构上可操控的 TESS 器件，用于半导体自旋电子器件的应用。

引用次数: 0

Simultaneous cooling of high-frequency difference resonators through voltage modulation and intracavity-squeezed light 通过电压调制和腔内挤压光同时冷却高频差谐振器

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-08 DOI: 10.1016/j.cjph.2024.10.033

Liang Wang , Wei Zhang , Tie Wang , Shutian Liu , Shou Zhang , Hong-Fu Wang

We propose a scheme to achieve simultaneous cooling of the mechanical and radio-frequency resonators in a hybrid optoelectromechanical system. By introducing the voltage modulation switch and intracavity-squeezed light, the high-frequency difference resonators can be successfully cooled to their quantum ground states by eliminating cavity mode dissipation through precise phase and amplitude matching of the squeezed pump field and the cooling optical field. More significantly, ground-state cooling can be achieved even in the highly unresolved sideband regime, and the quantum backaction heating can be effectively suppressed, leading to a significant improvement in cooling performance. Our work provides an alternative approach for quantum coherent manipulation of multiple mechanical systems with different resonant frequencies.

我们提出了一种在混合光机电系统中同时冷却机械谐振器和射频谐振器的方案。通过引入电压调制开关和腔内挤压光，高频差谐振器可以通过挤压泵浦场和冷却光场的精确相位和振幅匹配来消除腔模耗散，从而成功冷却到其量子基态。更重要的是，即使在高度未分辨的边带系统中也能实现地态冷却，量子反作用加热也能得到有效抑制，从而显著提高冷却性能。我们的工作为具有不同共振频率的多个机械系统的量子相干操纵提供了另一种方法。

引用次数: 0

Dynamical analysis and hardware verification of a new multistable memristive hyperchaotic map 新型多稳态记忆超混沌图的动态分析和硬件验证

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-04 DOI: 10.1016/j.cjph.2024.10.031

Qiang Lai , Chongkun Zhu , Luigi Fortuna

In this paper, a three-dimensional (3D) memristive hyperchaotic map is designed by coupling discrete memristor (DM). Structurally, the map features the existence of infinite fixed points. Based on the differential setting of parameters for various initial values, it can produce an infinite number of heterogeneous coexisting attractors or homogeneous coexisting attractors. Simultaneously, it can realize the attractors symmetric control. The numerical analysis and simulation results highlight its rich dynamical behaviors and excellent performance. A digital hardware platform based on a microcontroller is designed, clearly demonstrating the efficacy of the design through distinct visualization of attractors on an oscilloscope, providing tangible evidence of the successful hardware platform implementation.

本文通过耦合离散忆阻器（DM）设计了一种三维（3D）忆阻超混沌图。从结构上看，该图具有存在无限定点的特点。基于对不同初始值参数的微分设置，它可以产生无限多的异质共存吸引子或同质共存吸引子。同时，它还能实现吸引子的对称控制。数值分析和仿真结果凸显了其丰富的动力学行为和卓越的性能。设计了一个基于微控制器的数字硬件平台，通过示波器对吸引子的清晰可视化，清楚地展示了设计的功效，为硬件平台的成功实现提供了切实的证据。

引用次数: 0

Ultrahigh quality factor cavity based on double dielectric nanocylinder metasurfaces 基于双介电纳米圆柱元表面的超高品质因数空腔

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.cjph.2024.10.036

Seokhyeon Hong, Youngsoo Kim, Seung Hyeon Hong, Bokyung Kim, Soon-Hong Kwon

An optical cavity with a high quality factor (Q-factor) is essential for a wide range of applications, including lasers, single-photon sources, optical filters, and sensors. A high Q-factor cavity can enhance the interaction between light and materials, thereby improving the performance of optical devices. The Fabry–Pérot (FP) cavity is a typical optical device capable of achieving a high Q-factor; however, it often relies on distributed Bragg reflectors, which increase the size of the optical device. In recent years, Mie scattering-based metasurfaces with high reflectivity have been studied as alternatives to distributed Bragg reflectors. We propose a scattering-based FP cavity consisting of two metasurface layers. In our structure, a FP cavity with high reflectivity is formed by back-forward scattering from a single dielectric cylinder array. Our findings show that the structure exhibits a Q-factor of 4.36 × 10¹⁰ when the period and gap size are 658.8 nm and 740 nm, respectively. This high Q-factor is maintained even with misalignment between the two layers. Additionally, we confirmed that a high Q-factor of 2.6 × 10⁶ appears in the low-index substrate structure, with the Q-factor increasing with the number of double cylinders in the finite structure. We also observed a strong directionality in the z-axis direction when examining the far field. We designed the dielectric FP cavity with a subwavelength thickness, is expected to significantly contribute to enhancing the Q-factors of various types of optical cavities.

具有高品质因数（Q 因子）的光腔对于激光器、单光子源、光学滤波器和传感器等广泛应用至关重要。高 Q 因子空腔可以增强光与材料之间的相互作用，从而提高光学设备的性能。法布里-佩罗（Fabry-Pérot，FP）腔是一种能够实现高 Q 因子的典型光学器件，但它通常依赖于分布式布拉格反射器，从而增加了光学器件的尺寸。近年来，人们开始研究基于米氏散射的高反射率元表面，以替代分布式布拉格反射器。我们提出了一种由两层元表面组成的基于散射的 FP 腔。在我们的结构中，具有高反射率的 FP 腔是通过单个介质圆柱阵列的后向散射形成的。我们的研究结果表明，当周期和间隙尺寸分别为 658.8 nm 和 740 nm 时，该结构的 Q 值系数为 4.36 × 1010。即使两层之间出现错位，也能保持如此高的 Q 因子。此外，我们还证实在低指数基底结构中出现了 2.6 × 106 的高 Q 因子，Q 因子随有限结构中双圆柱的数量而增加。我们还观察到远场在 Z 轴方向具有很强的方向性。我们设计的介质 FP 腔具有亚波长厚度，有望显著提高各类光腔的 Q 因子。

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引用次数: 0

Systematic study of α-decay in neutron-deficient nuclei 缺中子原子核中的α衰变系统研究

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-10-31 DOI: 10.1016/j.cjph.2024.10.029

M. Ismail, A. Adel, A.Y. Ellithi, M.A. Abbas

The

α

-decay half-lives of 266 neutron-deficient nuclei in the 52

\leq Z \leq

118 range are calculated within the density-dependent cluster model. The realistic Michigan three-range Yukawa-Paris nucleon–nucleon interaction is used to calculate the

α

-core interaction potential within the double-folding model (DFM) context. In addition to the double-folding model, four analytical formulas are employed to compute the half-life time for the neutron-deficient nuclei. The obtained results from the five theoretical approaches are compared to the most recent experimental data. The calculated results from the DFM and the universal decay law (UDL) were in good agreement with the experimental data. A universal curve for

α

-decay of neutron-deficient nuclei has been analyzed, illustrating the correlation between the decimal logarithm of the experimental half-lives and the negative decimal logarithm of penetrability. We studied the variation of

{log}_{10} T

with the neutron number of the daughter nuclei,

N_{d}

, for different neutron-deficient isotopes in the range 78

\leq Z \leq

92. We attempt to predict the neutron energy levels for each isotope from the behavior of

{log}_{10} T

against

N_{d}

. Moreover, the impact of higher-multipolarity deformations, up to hexacontratetrapole, on the behavior of

α

-decay half-lives around the neutron shell closure

N = 126

is investigated, both with and without including octupole deformation.

在密度依赖的簇模型中计算了 52 ≤Z≤118 范围内 266 个缺中子原子核的 α 衰变半衰期。在双折叠模型（DFM）背景下，使用现实的密歇根三程汤川-巴黎核子-核子相互作用来计算α-核相互作用势。除了双折叠模型之外，还采用了四种分析公式来计算缺中子原子核的半衰期时间。将五种理论方法得出的结果与最新的实验数据进行了比较。DFM和通用衰变定律（UDL）的计算结果与实验数据十分吻合。我们分析了缺中子原子核α衰变的普遍曲线，说明了实验半衰期的十进制对数与穿透性的负十进制对数之间的相关性。我们研究了 78 ≤Z≤92 范围内不同中子缺乏同位素的 log10T 随子核 Nd 的中子数变化的情况。我们试图通过 log10T 与 Nd 的关系来预测每种同位素的中子能级。此外，我们还研究了中子壳闭合 N=126 附近更高的多极性变形（直至六极）对 α 衰变半衰期行为的影响，包括八极变形和不包括八极变形。

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引用次数: 0

(2+1)-dimensional Burgers equation with a Caputo fractional derivative: Lie symmetry analysis, optimal system, exact solutions and conservation laws (2+1)-dimensional Burgers equation with a Caputo fractional derivative：列对称分析、最优系统、精确解和守恒定律

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-10-29 DOI: 10.1016/j.cjph.2024.10.026

Yapeng Shi , Yuqiang Feng , Jicheng Yu , Jun Jiang

In this paper, the Lie group method is applied to analyze the (2+1)-dimensional Burgers equation with Caputo fractional derivative. The infinitesimal generators of the equation are investigated. Then, using the Lie point symmetry of the equation, a one-dimensional optimal system is constructed. Subsequently, within the framework of the optimal system, the equation is symmetrically simplified and the exact solutions of the original equation are determined using the invariant subspace method and the homogeneous balance method. In the process of simplifying the equation to a (1+1)-dimensional fractional differential equation, it is deliberately avoided to use complex Erdélyi-Kober fractional derivative operator. Instead, a simple transformation is utilized to obtain a low-dimensional fractional differential equation. Finally, based on the concept of nonlinear self-adjointness, the conservation laws of the fractional differential equation are obtained.

本文应用李群方法分析了带有卡普托分数导数的 (2+1)-dimensional Burgers 方程。研究了方程的无穷小生成器。然后，利用方程的列点对称性，构建了一个一维最优系统。随后，在最优系统的框架内，利用不变子空间法和均质平衡法对方程进行对称简化并确定原始方程的精确解。在将方程简化为 (1+1) 维分数微分方程的过程中，刻意避免使用复杂的 Erdélyi-Kober 分数导数算子。取而代之的是利用简单的变换得到低维分数微分方程。最后，基于非线性自相接的概念，得到了分数微分方程的守恒定律。

引用次数: 0

On the low-energy electromagnetic dipole modes in 151,153,155Sm Nuclei 关于 151、153、155Sm 核的低能电磁偶极模式

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-10-28 DOI: 10.1016/j.cjph.2024.10.030

E. Tabar, G. Hoşgör, H. Yakut, E. Kemah, Y. Karademirci Kömürcü

The recently observed low-energy magnetic dipole (M1) and electric dipole (E1) excitations in deformed ^151,153,155Sm are theoretically analysed. Rotational Invariant (RI-) and Translational-Galilean Invariant (TGI-) Quasiparticle Nuclear Model (QPNM) are used in the calculation of M1 and E1 properties, respectively. Both theories consider monopole pairing between nucleons, and the deformed Woods-Saxon potential is used as the mean-field potential. Pyatov's symmetry restoration procedure is applied in these models to eliminate the spurious modes from the intrinsic nuclear excitations. Model calculations show that although E1 transitions dominate the low-energy dipole spectra of ^151,153,155Sm, many low-lying M1 transitions exist in these nuclei. It is shown that the most significant contribution to E1 and M1 excitation comes from ΔK=±1 transitions. The theory satisfactorily reproduces the gross features of low-lying dipole modes determined from the Oslo Method analysis of the experimental spectra.

对最近在变形 151、153、155Sm 中观测到的低能磁偶极（M1）和电偶极（E1）激发进行了理论分析。在计算 M1 和 E1 特性时，分别使用了旋转不变（RI-）和平移-伽利略不变（TGI-）准粒子核模型（QPNM）。这两种理论都考虑了核子之间的单极配对，并使用变形伍兹-撒克逊势作为平均场势。在这些模型中应用了 Pyatov 对称性恢复程序，以消除来自内在核激发的虚假模式。模型计算表明，尽管 E1 转变在 151、153、155Sm 的低能偶极谱中占主导地位，但这些原子核中还存在许多低洼的 M1 转变。研究表明，对 E1 和 M1 激发贡献最大的是ΔK=±1 转变。该理论令人满意地再现了根据奥斯陆法分析实验光谱所确定的低洼偶极子模式的总体特征。

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引用次数: 0

Migration of a slip-spin solid spherical particle in a micropolar fluid-filled circular cylindrical tube 滑旋固体球形粒子在充满微极性流体的圆柱形圆管中的迁移

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-10-25 DOI: 10.1016/j.cjph.2024.10.024

Ahmed G. Salem

A combined study analytically and numerically for the axially symmetric creeping flow due to a slip-spin solid sphere surface moving in a microstructure fluid of micropolar type along the centreline of a circular cylindrical tube is introduced. This investigation was presented under low Reynolds number conditions. A general solution is obtained by superposing the essential solutions in both spherical and cylindrical coordinates to solve the Eringen micropolar field equations. The condition of the microrotation, along with couple stress, is used at the surface of the solid particle; while the microrotation is used at the inner cylindrical surface. Boundary conditions are imposed initially on the inner cylindrical surface using Fourier transforms and subsequently on the outer surface of the solid particle using a collocation technique. This paper aims to study the wall interaction problem of a translating slip-spin solid spherical particle in a micropolar fluid along the centreline of a circular cylindrical tube. The study also investigates the effect of the addition of slip conditions for velocity and microrotation on the surface of a solid particle. There is good convergence in the numerical findings obtained for the normalised hydrodynamic drag force (the tube-corrected factor) applying on the surface of the solid particle for several values of the micropolarity coefficient, slip-spin coefficients, and the ratio between the radius of the solid particle and tube. Regarding the flow of a solid spherical particle along the centreline of a cylindrical tube, our drag findings compare favourably to the solutions found in the literature. We found that the normalised drag force acting on the solid particle monotonically increases with the increase of the particle-to-tube radius ratio and reaches infinity in the limitless, with the increase of the micropolarity coefficient, and with the increase of the slip-spin coefficients for a steady ratio of particle-to-tube radius.

本文介绍了对滑旋固体球面在沿圆柱管中心线运动的微波型微结构流体中产生的轴对称蠕动流进行的分析和数值综合研究。该研究是在低雷诺数条件下进行的。通过叠加球坐标和圆柱坐标下的基本解来求解艾林根微极场方程，从而获得了一般解。在固体颗粒表面使用了微旋转条件和耦合应力；而在内圆柱表面使用了微旋转条件。边界条件最初通过傅立叶变换施加在内圆柱面上，随后通过搭配技术施加在固体颗粒的外表面上。本文旨在研究滑旋固体球形粒子在微极性流体中沿圆柱管中心线平移时的壁面相互作用问题。研究还探讨了在固体颗粒表面添加速度和微旋转滑移条件的影响。对于固体颗粒表面上的归一化流体动力阻力（管校正系数），在微极性系数、滑旋系数和固体颗粒与管半径之比取值时，数值结果收敛性良好。关于固体球形粒子沿圆柱形管中心线的流动，我们的阻力研究结果与文献中的解决方案相比毫不逊色。我们发现，作用在固体颗粒上的归一化阻力随着颗粒与管子半径比的增大而单调增大，并在无限大的情况下达到无穷大；在颗粒与管子半径比稳定的情况下，随着微极性系数的增大以及滑旋系数的增大而增大。

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引用次数: 0

Three-phase lag model for thermal conductivity of a thermo-viscoelastic porous medium 热弹性多孔介质导热性的三相滞后模型

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2024-10-22 DOI: 10.1016/j.cjph.2024.10.025

Montaser Fekry , Mohamed I.A. Othman

This paper investigates the propagation of waves and the thermal behavior in a thermo-viscoelastic porous medium using the three-phase-lag (TPL) model which accounts for phase lags in the heat flux vector, temperature gradient and thermal displacement gradient. The study aims to capture the interactions between thermal, mechanical, and structural properties of the thermo-viscoelastic porous, isotropic, homogeneous medium. The governing equations, incorporating the TPL heat conduction law and constitutive relations for the viscoelastic porous material, are derived and analyzed. The impact of relaxation times, porosity, and viscoelastic parameters on heat propagation is investigated through analytical solutions by normal modal analysis. Analytical representations of various physical quantities (stresses components, displacements, temperature,…) in the material's domain are derived. These expressions are then assessed numerically for a specific material, with the outcomes depicted graphically. A comparison is made between the predictions of the three-phase-lag (TPL), the dual-phase-lag (DPL) and Lord–Shulman (L–S) theories in the absence and presence of voids.

本文使用三相滞后（TPL）模型研究了热粘弹性多孔介质中波的传播和热行为，该模型考虑了热通量矢量、温度梯度和热位移梯度的相位滞后。该研究旨在捕捉热-粘弹性多孔、各向同性、均质介质的热、机械和结构特性之间的相互作用。推导并分析了包含 TPL 热传导定律和粘弹性多孔材料构成关系的控制方程。通过法向模态分析的分析解，研究了弛豫时间、孔隙率和粘弹性参数对热传播的影响。推导出了材料域中各种物理量（应力分量、位移、温度......）的分析表达式。然后，针对特定材料对这些表达式进行数值评估，并用图形对结果进行描述。比较了三相滞后理论（TPL）、双相滞后理论（DPL）和 Lord-Shulman 理论（L-S）在无空隙和有空隙情况下的预测结果。

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