Chinese Journal of Physics最新文献

英文中文

Oscillatory electro-magneto-hydrodynamics of third-grade fluid microflows 三级流体微流的振荡电磁流体力学

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

Chinese Journal of Physics

Pub Date : 2025-11-27 DOI: 10.1016/j.cjph.2025.11.028

Ruikang Yang , Zhiyong Xie , Yongjun Jian

Oscillatory electrokinetic microflows of third-grade fluids exhibit complex multi-physics coupling that challenges conventional microfluidic control. This work establishes a dynamic electro-magneto-hydrodynamic (EMHD) model based on the Debye-Hückel linearization and regular perturbation method. To address the high-order nonlinearity and transient characteristics of the momentum equation for third-grade fluids, the regular perturbation and Laplace transform approach are employed for the first time to solve the equation, deriving a semi-analytical solution that decouples transient startup and quasi-periodic flow regimes through term decomposition. Analysis reveals that memory effects—governed by the non-Newtonian dimensionless parameter a₁, which characterizes the fluid’s shear energy storage capacity—enhance oscillatory diffusion depth while suppressing velocity amplitudes as a₁ increases. Notably, domain-wide shear stress vanishes under the extreme condition a₁→∞. Synergistic analysis shows that electromagnetic field tuning optimizes flow rate via the force balance condition Ha ≈ 1.6/

η

(obtained from isocontour maximization) and achieves the peak pumping efficiency while maintaining enhanced mixing efficiency through near-wall oscillations. This framework culminates in an optimized parameter set, providing a theoretical guideline for designing microfluidic devices that balance high pumping efficiency with enhanced mixing efficiency.

三级流体的振荡电动力学微流表现出复杂的多物理场耦合，这对传统的微流控提出了挑战。本文建立了基于debye - h ckel线性化和正则摄动方法的动态电磁-磁流体动力学模型。针对三级流体动量方程的高阶非线性和瞬态特性，首次采用正则摄动和拉普拉斯变换方法求解该方程，通过项分解得到了瞬态启动和准周期流态解耦的半解析解。分析表明，记忆效应——由表征流体剪切蓄能能力的非牛顿无量纲参数a1控制——增加了振荡扩散深度，同时随着a1的增加抑制了速度振幅。值得注意的是，在极端条件a1→∞下，全域剪应力消失。协同分析表明，电磁场调谐通过力平衡条件Ha≈1.6/η（由等轮廓最大化得到）来优化流量，并通过近壁振荡达到泵送效率峰值，同时保持了提高的混合效率。该框架最终得到了一个优化的参数集，为设计平衡高泵送效率和增强混合效率的微流体装置提供了理论指导。

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引用次数: 0

Fractional mode charges in acoustic non-Hermitian topological Anderson insulator 声学非厄米拓扑安德森绝缘子中的分数模式电荷

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

Chinese Journal of Physics

Pub Date : 2025-11-26 DOI: 10.1016/j.cjph.2025.11.032

Wenbin Lv , Jinyang He , Han Cao , Chudong Xu , Ming-Hui Lu

The investigation of non-Hermitian topological systems has attracted significant attention across diverse fields, including photonics and acoustics. Recent studies have demonstrated that disorder can induce topological states in otherwise trivial systems, leading to the discovery of Non-Hermitian topological Anderson insulator (NH-TAI). This study explores the effects of non-Hermitian disorder on acoustic systems through numerical simulations and theoretical calculation. Coupled acoustic cavity arrays with non-Hermitian disorder profiles in one- and two-dimensional configurations are investigated. The findings reveal that tuning the disorder strength can induce a transition from a trivial to a nontrivial topological phase. More importantly, by calculating the fractional mode charges through integration of the local density of states (LDOS) within the band gap, it is demonstrated that non-Hermitian disorder alone can induce a topological Anderson phase characterized via fractional mode charges. Additionally, the robustness of the system is confirmed by simulating structural defects. These findings are applicable to other physical platforms, such as optics, and pave a pathway for future research in non-Hermitian acoustics.

对非厄米拓扑系统的研究已经引起了包括光子学和声学在内的各个领域的极大关注。最近的研究表明，无序可以在其他平凡系统中诱导拓扑状态，从而发现了非厄米拓扑安德森绝缘子（NH-TAI）。本文通过数值模拟和理论计算，探讨了非厄米无序对声学系统的影响。研究了具有一维和二维非厄米无序分布的耦合声腔阵列。研究结果表明，调整无序强度可以诱导从平凡到非平凡拓扑阶段的转变。更重要的是，通过积分带隙内的局域态密度（LDOS）计算分数模式电荷，证明了非厄米无序可以单独诱导出以分数模式电荷为特征的拓扑Anderson相。此外，通过对结构缺陷的仿真验证了系统的鲁棒性。这些发现适用于其他物理平台，如光学，并为未来的非厄米声学研究铺平了道路。

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引用次数: 0

Gain-assisted enhanced rotary and lateral photon drags in bidirectionally rotating chiral nanostructures 双向旋转手性纳米结构中增益辅助增强的旋转和侧向光子拖拽

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

Chinese Journal of Physics

Pub Date : 2025-11-25 DOI: 10.1016/j.cjph.2025.11.026

Muhammad Idrees , Junwei Hu , Yuee Xie , Fazal Badshah , Amir Khesro , Zhen-Xia Niu , Hui-Jun Li , Fuad A. Awwad , Emad A A Ismail

This study presents a theoretical investigation of the gain-assisted rotary and lateral photon drag effects induced by bidirectional rotation in chiral nanostructures composed of laterally coupled CdSe/ZnS semiconductor double quantum dot molecules. The system is driven by a combination of probe and control electromagnetic fields, where electron tunneling strength plays a pivotal role in shaping the optical, chiral, and gain-assisted responses. The chiral medium exhibits strong magnetoelectric coupling and structural asymmetry, enabling dynamic control over the rotary and lateral photon drag effects for both left- and right-circularly polarized (LCP and RCP) beams. Notably, the bidirectional rotation of the chiral nanostructure significantly enhances the drag response, with the degree of enhancement being strongly dependent on the tunneling strength. A large negative group index is observed, particularly for the RCP beam, indicating the presence of anomalous dispersion, medium gain, and high sensitivity to rotational dynamics. Additionally, the lateral photon drag demonstrates tunable beam displacement under varying tunneling strengths, offering an additional degree of control in light manipulation. Furthermore, the divergence angle between LCP and RCP beams, as well as the group indices, are shown to vary with the phase of the control field and magnetic field detuning. The electric and magnetic susceptibilities, along with the chiral coefficients, reveal enhanced dispersion and reduced absorption (even showing gain) at higher tunneling strengths. These results highlight the critical role of chirality, tunneling, gain, and rotational control in modulating light-matter interactions and pave the way for practical applications in lateral beam steering, optical communication, polarization encoding, optical tweezers, and chiral sensing technologies.

本文从理论上研究了由CdSe/ZnS半导体双量子点分子组成的手性纳米结构中双向旋转诱导的增益辅助旋转和侧向光子阻力效应。该系统由探针和控制电磁场的组合驱动，其中电子隧穿强度在形成光学，手性和增益辅助响应中起着关键作用。手性介质表现出强磁电耦合和结构不对称性，能够动态控制左圆极化和右圆极化（LCP和RCP）光束的旋转和横向光子阻力效应。值得注意的是，手性纳米结构的双向旋转显著增强了阻力响应，并且增强的程度强烈依赖于隧道强度。观察到一个大的负群指数，特别是对于RCP光束，表明存在异常色散，中等增益和对旋转动力学的高灵敏度。此外，在不同的隧道强度下，横向光子拖拽显示了可调谐的光束位移，为光操作提供了额外的控制程度。此外，LCP和RCP光束之间的发散角以及群指数随控制场的相位和磁场失谐而变化。电导率和磁化率以及手性系数显示，在较高的隧穿强度下，色散增强，吸收减少（甚至显示增益）。这些结果突出了手性、隧穿、增益和旋转控制在调制光-物质相互作用中的关键作用，并为横向光束转向、光通信、偏振编码、光镊和手性传感技术的实际应用铺平了道路。

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引用次数: 0

Thermal transport effects on electrokinetic flow and ion partitioning in soft nanochannel 热传递对软纳米通道中电动流动和离子分配的影响

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

Chinese Journal of Physics

Pub Date : 2025-11-25 DOI: 10.1016/j.cjph.2025.11.025

Deepak Kumar , Saurabh Kr Maurya

This study examines thermal transport and electroosmotic flow of an ionized electrolyte solution in a soft slit nanochannel with polyelectrolyte-coated walls. The polyelectrolyte layer (PEL), modeled as a fixed charge layer, interacts with ions both inside and outside, creating a semi-permeable interface. A dielectric difference between the PEL and electrolyte induces ion partitioning effects. The coupled Poisson-Boltzmann and Navier-Stokes equations are solved, with closed-form expressions obtained under the Debye-Hückel approximation and numerical solutions derived via finite difference approach. The influence of key dimensionless parameters on potential, velocity, ion distribution, temperature profile, and Nusselt and Brinkman number is analyzed. Results highlight the role of electrokinetic effects, Joule heating, ionic selectivity, and viscous dissipation in governing nanoscale thermal transport phenomena.

本研究考察了电离电解质溶液在具有聚电解质包覆壁的软狭缝纳米通道中的热传递和电渗透流动。聚电解质层（PEL），建模为固定电荷层，与内外离子相互作用，形成半渗透界面。PEL和电解质之间的介电差引起离子分配效应。求解了耦合的泊松-玻尔兹曼方程和纳维-斯托克斯方程，得到了debye - h ckel近似下的封闭表达式和有限差分方法下的数值解。分析了关键无量纲参数对电势、速度、离子分布、温度分布以及努塞尔和布林克曼数的影响。结果强调了电动力学效应、焦耳加热、离子选择性和粘性耗散在控制纳米尺度热输运现象中的作用。

引用次数: 0

First-principles study of spin-orbit torques through Bloch states 布洛赫态自旋轨道转矩的第一性原理研究

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

Chinese Journal of Physics

Pub Date : 2025-11-24 DOI: 10.1016/j.cjph.2025.11.014

Yu-Hsiang Fu , Bao-Huei Huang , Yu-Hui Tang , Chao-Cheng Kaun

In this study, we combine first-principles calculations with theoretical derivations to highlight the crucial role of Bloch states in determining spin-orbit torque (SOT) in nanomaterials. The underlying mechanism is that the evanescent states and cross-terms with different phases can be neglected in an infinite system. Our approach enables the use of symmetry analysis to identify the relationship of key components in the equilibrium SOT. For instance, for nonmagnetic WSe₂, WSSe monolayers, and the iron thin film, our symmetry analysis can be well adapted to examine the relationship of equilibrium SOT in (k_x, k_y) space. Since magnetic moments break certain lattice symmetries in the iron thin film, the equilibrium SOT of magnetic iron thin film is larger than that of WSSe.

在这项研究中，我们将第一性原理计算与理论推导相结合，以突出布洛赫态在决定纳米材料自旋轨道扭矩（SOT）中的关键作用。潜在的机制是，在无限系统中，具有不同相的消失态和交叉项可以被忽略。我们的方法可以使用对称分析来确定平衡SOT中关键成分的关系。例如，对于非磁性WSe2， WSSe单层和铁薄膜，我们的对称性分析可以很好地适用于（kx, ky）空间中平衡SOT的关系。由于磁矩破坏了铁薄膜的晶格对称性，磁性铁薄膜的平衡SOT大于WSSe。

引用次数: 0

Mean energy, entropy, and specific heat of monolayer black phosphorus in the presence of a magnetic field: Non-extensive formalism 磁场作用下单层黑磷的平均能量、熵和比热：非泛化形式

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

Chinese Journal of Physics

Pub Date : 2025-11-22 DOI: 10.1016/j.cjph.2025.11.027

Chunyang Li , Zhanjun Li , Liu Long

A monolayer of black phosphorus (BP) is examined in the presence of an external magnetic field. The electronic energy spectrum is obtained through a tight-binding Hamiltonian, after which the non-extensive Tsallis statistical formalism is employed to evaluate the thermodynamic behavior of the system. Within this framework, the entropy, mean energy, and specific heat of the monolayer BP are systematically calculated. The results indicate that the specific heat exhibits a pronounced peak, characteristic of a Schottky-type anomaly at low temperatures. The position of this peak is temperature-dependent, while its amplitude varies with both the applied magnetic field and the non-extensive parameter q. Moreover, both the entropy and the mean energy increase monotonically with rising temperature, whereas an increase in magnetic field strength reduces the entropy at a fixed temperature.

在外加磁场的作用下，对单层黑磷（BP）进行了检测。通过紧结合哈密顿量得到电子能谱，然后采用非扩展的Tsallis统计形式评价系统的热力学行为。在此框架下，系统地计算了单层BP的熵、平均能和比热。结果表明，在低温下，比热有明显的峰值，具有肖特基型异常的特征。该峰值的位置与温度有关，其振幅随外加磁场和非扩展参数q的变化而变化。此外，熵和平均能量都随温度的升高而单调增加，而在固定温度下，磁场强度的增加使熵减小。

引用次数: 0

Dynamical topological quantum phase transitions in a finite-size spin system 有限尺寸自旋系统的动态拓扑量子相变

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

Chinese Journal of Physics

Pub Date : 2025-11-21 DOI: 10.1016/j.cjph.2025.11.020

Shaoying Yin , Hongchun Sun , Jinliang Guo , Lina Bai , Qiang Zhang

Based on a finite-size extended XY spin chain with topological characteristics, we investigate in detail the dynamical quantum phase transitions (DQPTs) induced by quench parameters, including the three-spin interaction, the external magnetic field, and the anisotropy parameters. Four constraint relations that the quench parameters must satisfy to ensure exact zeros of the Loschmidt echo are derived. When the values of prequench and post-quench parameters lie within regions corresponding to different topological quantum phases, the critical time associated with the nonanalytic behavior of DQPTs exhibits a single time scale, and this property remains independent of the magnitude of the change in winding numbers that characterize the topological quantum phases. However, when the quench parameter is suddenly changed within the same topological quantum phase and crosses three or four topological phase transition points, DQPTs are observed to occur, and even the number of critical time scales increases with the system size. In particular, for large spin chains, the rate function of the Loschmidt echo exhibits periodic oscillations as a function of time.

基于具有拓扑特征的有限尺寸扩展XY自旋链，我们详细研究了三自旋相互作用、外加磁场和各向异性参数引起的动态量子相变（DQPTs）。推导了为保证洛施密特回波的精确零点，淬火参数必须满足的四个约束关系。当猝灭前和猝灭后参数位于不同拓扑量子相对应的区域内时，与dqpt非解析行为相关的临界时间呈现单一时间尺度，并且该性质与表征拓扑量子相的绕组数变化的大小无关。然而，当淬灭参数在同一拓扑量子相内突然发生变化并跨越三个或四个拓扑相变点时，可以观察到dqpt的发生，甚至临界时间尺度的数量也随着系统尺寸的增加而增加。特别地，对于大的自旋链，洛施密特回波的速率函数作为时间的函数表现出周期性的振荡。

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引用次数: 0

Quantum entanglement in a two-cavity QED system mediated by a waveguide 波导介导的双腔QED系统中的量子纠缠

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

Chinese Journal of Physics

Pub Date : 2025-11-21 DOI: 10.1016/j.cjph.2025.11.023

J Alejandro Andrade

This paper presents a comprehensive analysis of a two-cavity quantum electrodynamics system, in which each cavity hosts two quantum dots coupled via a waveguide. By deriving the eigenvectors and eigenvalues of the Hamiltonian, we identified a range of highly entangled states involving four excitons in the quantum dots and photons shared between the cavities. The temporal evolution of the Schrödinger equation was then employed to examine the phases of these entangled states and the specific times at which they emerge, while the degree of entanglement was quantified using the von Neumann entropy. Furthermore, we incorporated decoherence effects by solving the Lindblad master equation, enabling the determination of the effective time window for manipulating the entangled states before decoherence degrades their dynamics.

本文全面分析了一个双腔量子电动力学系统，其中每个腔中有两个通过波导耦合的量子点。通过推导哈密顿量的特征向量和特征值，我们确定了量子点中的四个激子和腔间共享的光子的高度纠缠态范围。然后使用Schrödinger方程的时间演化来检查这些纠缠态的相位和它们出现的特定时间，同时使用冯·诺伊曼熵来量化纠缠的程度。此外，我们通过求解Lindblad主方程将退相干效应纳入其中，从而能够确定在退相干降低纠缠态动力学之前操纵纠缠态的有效时间窗。

引用次数: 0

Coherent generation and transfer of distant Bi- and tripartite entanglement in a hybrid atom-opto-magnomechanical system 原子-光-磁-力混合系统中远距离双、三方纠缠的相干产生和转移

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

Chinese Journal of Physics

Pub Date : 2025-11-21 DOI: 10.1016/j.cjph.2025.11.021

Abdelkader Hidki , Amjad Sohail , Jamila Hmouch , Noureddine Benrass , Abderrahim Lakhfif , Mostafa Nassik

We propose a theoretical framework for generating and transferring macroscopic bipartite and tripartite entanglement in a hybrid magnon-microwave-atom-optomechanical system. This hybrid configuration includes five coupled modes: an optical cavity, a microwave cavity, a magnon mode, a mechanical oscillator, and an ensemble of two-level atoms. Entanglement is initially generated between the optical and mechanical modes by radiation pressure and then transferred to the atom-cavities and magnon-microwave subsystems through state-swap interactions. These entangled subsystems, in turn, mediate indirect entanglement between distant modes such as the atom-phonon, phonon-microwave, phonon-magnon, atom-magnon, magnon-optical, optical-microwave pairs, as well as the atom-magnon-phonon tripartite subsystem. We show that by tuning system parameters (including detunings, coupling strengths, and dissipation rates), the strength and stability of the entanglement can be significantly improved, even in the presence of thermal noise. This work provides a promising platform for achieving robust and long-range entanglement in hybrid multi-mode systems, with potential applications in quantum information technology.

我们提出了一个在磁-微波-原子-光力学混合系统中产生和传递宏观二、三方纠缠的理论框架。这种混合结构包括五种耦合模式：光学腔、微波腔、磁振子模式、机械振荡器和两能级原子系综。纠缠最初是由辐射压力在光学和机械模式之间产生的，然后通过状态交换相互作用转移到原子腔和磁振子-微波子系统。这些纠缠的子系统，反过来，介导遥远模式之间的间接纠缠，如原子-声子，声子-微波，声子-磁子，磁子-光学，光学-微波对，以及原子-磁子-声子三方子系统。我们表明，通过调整系统参数（包括失谐、耦合强度和耗散率），即使在存在热噪声的情况下，纠缠的强度和稳定性也可以显着提高。这项工作为在混合多模系统中实现鲁棒和远程纠缠提供了一个有前途的平台，在量子信息技术中具有潜在的应用前景。

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引用次数: 0

Synergistic experimental–dft investigation into photocatalytic efficiency of M-Type XFe12O19 (X = Ba, Sr) hexaferrites m型XFe12O19 （X = Ba, Sr）六铁体光催化效率的协同实验- dft研究

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

Chinese Journal of Physics

Pub Date : 2025-11-21 DOI: 10.1016/j.cjph.2025.11.024

Shahzadi Noreen , Ayesha Awais , A.F. Abd El-Rehim , Amna Parveen , Heba Y Zahran , I.S. Yahia , Zeesham Abbas

The XFe₁₂O₁₉ (X = Ba, Sr) M-type hexaferrites were successfully synthesized using the sol-gel auto-combustion process to examine their structural, morphological, electronic, photocatalytic, and optical properties, supported by density functional theory (DFT) calculations. This work combines comprehensive experiments with first-principles calculations to clearly and comparatively explain how substituting Sr²⁺ and Ba²⁺ into the M-type XFe₁₂O₁₉ (X = Ba, Sr) structure influences the lattice, alters the electronic and optical characteristics, and impacts the material's photocatalytic behavior. The XRD analysis confirms single-phase hexagonal magnetoplumbite structures (P63/mmc) without secondary phases, with experimentally measured crystalline sizes of 44.54 nm for BaFe₁₂O₁₉ and 33.72 nm for SrFe₁₂O₁₉. The structural properties of both hexaferrites show good agreement between theoretical and experimental results. SEM images reveal plate-like morphologies with agglomerated grains, while EDX analysis confirms a stoichiometric composition. The simulated electronic band structures show direct transitions in these compositions, and calculated values match experimental results. Optical studies identify direct energy band gaps of 2.676 eV for BaFe₁₂O₁₉ and 1.602 eV for SrFe₁₂O₁₉, as determined by UV-Vis spectroscopy. BaFe₁₂O₁₉ and SrFe₁₂O₁₉ hexaferrites degraded Methylene Blue by 81% and 97%, respectively, demonstrating that the first-order kinetic model fits well with the excellent photocatalytic oxidation. Theoretical findings align with experimental results from FTIR, UV–Vis, PL, and photocatalytic tests, confirming that these compositions are promising for photocatalytic applications.

采用溶胶-凝胶自燃烧法制备了XFe12O19 (X = Ba, Sr) m型六铁体，并通过密度泛函理论（DFT）计算分析了其结构、形态、电子、光催化和光学性能。本工作将综合实验与第一性原理计算相结合，清晰、比较地解释了Sr 2 +和Ba 2 +取代m型XFe12O19 （X = Ba, Sr）结构对晶格的影响、电子和光学特性的改变以及对材料光催化行为的影响。XRD分析证实了无二次相的单相六方磁铅石结构（P63/mmc），实验测得bfe12o19和SrFe12O19的晶粒尺寸分别为44.54 nm和33.72 nm。这两种六铁氧体的结构性能与理论和实验结果吻合较好。扫描电镜图像显示板状形态，颗粒聚集，而EDX分析证实了化学计量成分。模拟的电子能带结构显示了这些成分的直接跃迁，计算值与实验结果吻合。光学研究发现，通过紫外可见光谱测定，bfe12o19的直接能带隙为2.676 eV， SrFe12O19的直接能带隙为1.602 eV。BaFe12O19和SrFe12O19六铁体对亚甲基蓝的降解率分别为81%和97%，表明一级动力学模型与优异的光催化氧化效果吻合。理论研究结果与FTIR、UV-Vis、PL和光催化测试的实验结果一致，证实了这些组合物在光催化应用方面的前景。

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