Physics Letters A最新文献

英文中文

Preservation law involving information potential and Jensen-variance distance: Application to stationary gaussian processes 包含信息势和Jensen-variance距离的保存定律：在平稳高斯过程中的应用

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-28 Epub Date: 2026-01-28 DOI: 10.1016/j.physleta.2026.131421

Javier E. Contreras-Reyes

Information potential was initially contextualized for adaptive systems training in the information-theoretic learning field to quantify information in probability density functions. Recently, the information potential has been extended to sample sets whose systems are defined by n-dimensional Gaussian random variables. This paper proposes a preservation law that involves information potential and Jensen-variance distance between two n-dimensional Gaussian random variables. The result is applied to stationary Gaussian processes to derive the variance-distance rate (VDR), which only depends on sample size and not on the weighted parameter of Jensen-variance distance. Moreover, a Blackman–Tukey spectral density estimator was used to estimate the VDR between two stationary Gaussian processes. The fractional difference noise process was studied, where an asymptotic form was derived and an upper bound given. The results highlight the good performance of the proposed estimator, as the estimated VDRs closely match the theoretical ones when the fractional difference noise processes are stationary.

信息势最初是在信息理论学习领域的自适应系统训练中被语境化的，用于在概率密度函数中量化信息。最近，信息势已经扩展到样本集，其系统由n维高斯随机变量定义。本文提出了一种包含两个n维高斯随机变量之间的信息势和Jensen-variance距离的保存律。将所得结果应用于平稳高斯过程，得到只依赖于样本量而不依赖于jensen -方差距离加权参数的方差距离率（VDR）。此外，利用Blackman-Tukey谱密度估计器估计两个平稳高斯过程之间的VDR。研究了分数阶差分噪声过程，给出了它的渐近形式和上界。结果表明，当分数阶差分噪声过程平稳时，估计的vdr与理论的非常接近。

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引用次数: 0

Designing double-shell capsules to achieve high neutron yield 设计双壳胶囊实现高中子产率

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-27 DOI: 10.1016/j.physleta.2026.131423

Y. Li , X.H. Yang , Z. Li , L.R. Li , B.H. Xu , G.B. Zhang , Z.N. Zhang , L. Guo , H. Li , Y.Y. Ma

A theoretical model describing the implosion dynamics of the double-shell capsules for high neutron yield was developed based on the steady-state ablation theory and the strong shock wave theory. An optimal capsule structure for the 100 kJ facility is proposed through a theoretical optimization process, achieving a neutron yield of 9.46 × 10¹¹ with DD fuel in 1D simulations using the radiation hydrodynamic code MULTI. Then the theoretical capsule is optimized further via the combination of random walk and genetic algorithms, leading to a neutron yield of 1.56 × 10¹², that is, 65% improvement over the theoretical prediction. Compared to the theoretical optimization results, the machine learning optimization method gives a thinner inner shell and a thicker foam cushion layer, leading to an improved laser drive efficiency. Finally, an optimal capsule design can achieve a fusion yield of 8.46 MJ for DT fuel with a scaled energy of 1.5 MJ by employing hydro-equivalent implosions. The results provide valuable theoretical references for the experimental design of double-shell capsules.

基于稳态烧蚀理论和强激波理论，建立了描述高中子产率双壳胶囊内爆动力学的理论模型。通过理论优化过程，提出了100 kJ设施的最优胶囊结构，在辐射流体动力学代码MULTI的一维模拟中，使用DD燃料获得了9.46 × 1011的中子产率。然后通过随机漫步和遗传算法的结合对理论胶囊进行进一步优化，使中子产率达到1.56 × 1012，比理论预测提高了65%。与理论优化结果相比，机器学习优化方法使内壳更薄，泡沫垫层更厚，从而提高了激光驱动效率。最后，通过优化设计，利用水当量内爆，DT燃料的聚变当量为8.46 MJ，能量为1.5 MJ。研究结果为双壳胶囊的实验设计提供了有价值的理论参考。

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引用次数: 0

Spherically averaged Hartree-Fock orbitals in an APW-like framework: Comparison with Compton profile experiments 类apw框架中的球平均Hartree-Fock轨道：与康普顿剖面实验的比较

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-19 DOI: 10.1016/j.physleta.2026.131387

Julio C. Aguiar , Héctor O. Di Rocco

A spherically averaged, Hartree-Fock–augmented APW–like method is proposed for metals. Each valence orbital is described by a Hartree-Fock radial solution inside the Wigner-Seitz (WS) sphere and is matched in value and slope at the WS boundary to a free–electron exterior with mild exponential damping. A constant interstitial exchange–like shift sets the effective exterior wave number k_eff, which is estimated from LDA exchange at the density parameter r_s; an optional scalar–relativistic mapping is included. The resulting orbitals are bound–like near the ion and extended outside the WS sphere, bridging atomic and metallic behavior with a minimal, transparent set of parameters. Electron momentum densities are computed and aggregated into Compton profiles for direct comparison with experiment, yielding close agreement with high–resolution measurements. While APW–like in spirit, the approach does not enforce Bloch periodicity or full self–consistency; instead, it provides a lightweight, reproducible, physically motivated parameterization.

提出了一种球平均、hartree - fock增强的类apw方法。每个价电子轨道用Wigner-Seitz （WS）球内的harree - fock径向解来描述，并且在WS边界处的值和斜率与具有轻微指数阻尼的自由电子外部相匹配。一个恒定的间隙交换样位移设定了有效的外波数keff，它是由密度参数rs下的LDA交换估计的；包括一个可选的标量相对论映射。所得到的轨道在离子附近是键状的，并延伸到WS球外，以最小的透明参数集桥接原子和金属行为。电子动量密度被计算并汇总到康普顿剖面中，以便与实验进行直接比较，结果与高分辨率测量结果非常吻合。虽然在精神上类似于apw，但该方法不强制布洛赫周期性或完全自洽性；相反，它提供了一种轻量级的、可重复的、物理驱动的参数化。

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引用次数: 0

The control of Casimir force enabled by cross-Kerr nonlinearity 利用交叉克尔非线性实现对卡西米尔力的控制

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-20 DOI: 10.1016/j.physleta.2026.131389

Shakil Ahmad , Rashid Ahmad , Farhan Amir , Hazrat Ali , Rafi Ud Din , Abbas Ghaffar , Inzimam Ul Haq

Quantum vacuum fluctuations, one of the cornerstone of quantum physics, have many physical effects including the Casimir force, stimulating researchers in various disciplines of the scientific community. This manuscript demonstrates the manipulation of Casimir force between two closely spaced identical parallel plates under the effect of cross-Kerr nonlinearity with electromagnetically induced chirality. We use the Casimir-Lifshitz formula in connection with passivity conditions and obtain the sign of the Casimir force which, for the attractive Casimir force, is positive, whereas for the repulsive Casimir force, it is negative. We notice that by controlling the cross-Kerr field Rabi frequency, Casimir force switches from attractive to repulsive and contrariwise. Our findings reveal a pronounce enhancement in the magnitude of Casimir force via the cross-Kerr field, which may in turn be helpful to enhance the lifetimes of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS).

量子真空涨落是量子物理学的基石之一，它具有包括卡西米尔力在内的许多物理效应，激励着科学界各学科的研究人员。本文演示了在具有电磁感应手性的交叉克尔非线性作用下，两个紧密间隔的相同平行板间卡西米尔力的操纵。我们将卡西米尔- lifshitz公式与无源性条件联系起来，得到卡西米尔力的符号，对于吸引卡西米尔力是正的，而对于排斥卡西米尔力是负的。我们注意到，通过控制交叉克尔场拉比频率，卡西米尔力从吸引变为排斥，反之亦然。我们的研究结果表明，通过交叉kerr场，卡西米尔力的大小明显增强，这可能反过来有助于提高微机电系统（MEMS）和纳米机电系统（NEMS）的寿命。

引用次数: 0

Microstructural evolution and magnetic properties of nanocrystalline iron-cobalt-zirconium-molybdenum-boron-copper alloy 纳米晶铁-钴-锆-钼-硼-铜合金的显微组织演变及磁性能

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-24 DOI: 10.1016/j.physleta.2026.131410

Wanqiu Yu , Yaming Sun , Yanxiang Sun , XingWang Liu , Pingli Zhang

The study of Cu clusters is a critical research topic in the field of Fe-based nanocrystalline alloys. Herein, nanocrystalline Fe_40.5Co_40.5Zr₇Mo₂B₉Cu₁ alloys were prepared by annealing an as-quenched alloy. The first onset crystallization temperature (T_x1), first crystallization peak temperature (T_p1), second onset crystallization temperature (T_x2), and second crystallization peak temperature (T_p2) determined by differential scanning calorimetry were selected as annealing temperatures. The alloy subjected to annealing was investigated in terms of microstructural evolution and magnetic properties, such as Cu-specific differences between the as-quenched sample and those annealed at T_p1 and T_p2. The as-quenched alloy was amorphous and featured a uniform elemental distribution and composition comparable with the nominal one. In the alloy annealed at T_p1, the Co content of nanocrystals was similar to that of the residual amorphous matrix, whereas the Cu distribution was heterogeneous and characterized by clusters with sizes less than 7 nm. The alloy annealed at T_p2 exhibited fewer but larger Cu clusters and higher Co contents in Fe-deficient areas. Furthermore, lower Co contents were observed in Fe(Co) grains, and Cu nanocrystals were not detected by transmission electron microscopy. With increasing temperature, coercivity decreased and then increased, whereas specific saturation magnetization increased and then decreased.

铜团簇的研究是铁基纳米晶合金领域的一个重要研究课题。通过对淬火态合金进行退火，制备了Fe40.5Co40.5Zr7Mo2B9Cu1纳米晶合金。选择差示扫描量热法测定的第一开始结晶温度（Tx1）、第一结晶峰温度（Tp1）、第二开始结晶温度（Tx2）和第二结晶峰温度（Tp2）作为退火温度。研究了退火合金的显微组织演变和磁性能，如淬火样品与Tp1和Tp2退火样品之间的cu特异性差异。淬火合金为非晶态合金，元素分布均匀，成分与标称合金相当。在Tp1退火的合金中，纳米晶的Co含量与残余非晶基体相似，而Cu的分布则不均匀，以尺寸小于7 nm的团簇为特征。在Tp2处退火的合金在缺铁区表现出较少但较大的Cu团簇和较高的Co含量。此外，Fe（Co）晶粒中Co含量较低，透射电镜未检测到Cu纳米晶。随着温度的升高，矫顽力先减小后增大，比饱和磁化强度先增大后减小。

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引用次数: 0

Nonlinear analytical modeling of highly coupled hybrid acoustic metamaterials: An effective approach for a broad range of pressure levels and frequencies 高耦合混合声学超材料的非线性分析建模：一种适用于大范围压力水平和频率的有效方法

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-23 DOI: 10.1016/j.physleta.2026.131406

Saad Akram, Asif Israr

The attenuation of extreme acoustic environments in space launch vehicles, payload fairings, and space habitats requires advanced materials capable of maintaining high acoustic attenuation performance across a wide range of frequencies and sound pressure levels. Conventional passive treatments often fail to deliver sufficient performance under such variable conditions. This research presents a unified analytical framework for designing and modeling complex acoustic metamaterials for such applications. The framework captures broadband, amplitude-dependent, and multi-resonant behavior of metamaterials, accounting for nonlinear interactions and mutual coupling effects that become dominant under intense acoustic loads. Validation is carried out through Finite Element Analysis (FEA) and ASTM E2611-compliant experimental testing. The results show excellent agreement across linear and non-linear domains and offer a highly efficient computational method for predicting acoustic performance compared to conventional design and analysis techniques of lightweight acoustic metamaterials.

空间运载火箭、有效载荷整流罩和空间栖息地中极端声环境的衰减需要能够在宽频率和声压级范围内保持高声学衰减性能的先进材料。在这种多变的条件下，传统的被动处理往往不能提供足够的性能。本研究为此类应用的复杂声学超材料的设计和建模提供了一个统一的分析框架。该框架捕获了超材料的宽带、振幅依赖和多共振行为，考虑了在强声载荷下占主导地位的非线性相互作用和相互耦合效应。通过有限元分析（FEA）和符合ASTM e2611标准的实验测试进行验证。与传统的轻量化声学超材料设计和分析技术相比，研究结果显示了线性和非线性领域的良好一致性，为预测声学性能提供了一种高效的计算方法。

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引用次数: 0

Design of a switchable absorber/reflector metasurface with two independent channels 具有两个独立通道的可切换吸收/反射超表面的设计

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-27 DOI: 10.1016/j.physleta.2026.131424

Suying Li , Chang Zhou , Xiaofeng Zhou , Yuhua Yan , Helin Yang

This paper proposes a switchable metasurface absorber/reflector based on PIN diode modulation, featuring a simple structure, similar TE/TM responses in the symmetric states, and independently switchable functionaity. By dynamically controlling the PIN diodes, the metasurface can flexibly switch to four working states("00", "01", "10" and "11"). A dual-bias achitecture, composed of orthogonal horizontal and vertical configurations, allows independent regulation of two polarization channels while eliminating the need for complex biasing circuits. The good agreement between waveguide measurements and full-wave simulations corroborates the effectiveness of the proposed design. The metasurface’s reconfigurability enables it to adapt to complex electromagnetic environments, which enables practical applicability in intelligent EM control, radar stealth, and reconfigurable antennas.

本文提出了一种基于PIN二极管调制的可切换超表面吸收/反射器，其结构简单，对称状态下的TE/TM响应相似，具有独立切换功能。通过动态控制PIN二极管，超表面可以灵活切换到“00”、“01”、“10”、“11”四种工作状态。双偏置结构，由正交的水平和垂直配置组成，允许独立调节两个极化通道，同时消除了对复杂偏置电路的需要。波导测量结果与全波仿真结果吻合良好，证实了所提设计的有效性。超表面的可重构性使其能够适应复杂的电磁环境，从而在智能电磁控制、雷达隐身和可重构天线中具有实际应用价值。

引用次数: 0

Topological phase and skin effect in a non-Hermitian dimerized Kitaev model 非厄米二聚基塔耶夫模型的拓扑相和趋肤效应

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-24 DOI: 10.1016/j.physleta.2026.131407

Yu Yan , Kai-Xin Hu , Shutian Liu , Wen-Xue Cui , Ji Cao , Shou Zhang , Hong-Fu Wang

We investigate the non-Hermitian dimerized Kitaev model with intracell and intercell nonreciprocal hopping. In the Hermitian case, the topologically nontrivial phase region expands with increasing on-site potentials when the two sublattices have the same sign, but shrinks when their signs differ. When nonreciprocal hopping is introduced and on-site potentials share the same sign, the topologically nontrivial phase region gradually narrows as the nonreciprocity grows, accompanied by the emergence of the non-Hermitian skin effect–mainly dominated by intracell nonreciprocity. The skin direction characterized by the spectral winding number, correlates with the real part of the energy spectrum, which displays a Z₂ character protected by particle-hole symmetry. Conversely, when on-site potentials have opposite signs, the topological phase region widens with increasing nonreciprocity up to a critical value, beyond which it splits into two branches. Notably, the skin effect vanishes because opposite on-site potentials induce skin effects in opposing directions, balancing the system and allowing a topological phase to emerge. Our result provides a strategy for controlling the appearance and disappearance of the non-Hermitian skin effect by tuning on-site potentials in dimerized topological superconductors.

我们研究了具有细胞内和细胞间非互反跳变的非厄米二聚基塔耶夫模型。在厄米情况下，当两个子晶格具有相同的符号时，拓扑非平凡相区随着位势的增加而扩大，但当它们的符号不同时，拓扑非平凡相区缩小。当引入非互反跳变，且现场电位具有相同的符号时，随着非互易性的增加，拓扑非琐屑相区逐渐缩小，并伴随着以细胞内非互易为主的非厄米皮肤效应的出现。以谱圈数为特征的趋肤方向与能谱实部相关，在粒子-空穴对称性的保护下呈现出Z2特征。相反，当现场电位具有相反的符号时，拓扑相区随着非互易性的增加而变宽，直到一个临界值，超过这个临界值就会分裂成两个分支。值得注意的是，趋肤效应消失是因为相反的现场电位在相反的方向上诱导趋肤效应，平衡系统并允许拓扑相出现。我们的研究结果提供了一种通过调整二聚拓扑超导体中的现场电势来控制非厄米集肤效应的出现和消失的策略。

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引用次数: 0

Structural phase transition, electronic and optical properties of the 2D hybrid organic-inorganic perovskite-type 2C6MnCl4 二维有机-无机钙钛矿型2C6MnCl4的结构、相变、电子和光学性质

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-23 DOI: 10.1016/j.physleta.2026.131409

El Mustafa Ouaaka , Mustapha Aazza , Thierry Maris , El Mostafa Khechoubi

We have synthesized the hybrid material 1, 6-diaminhexane tetrachloro manganate (2C₆MnCl₄) by slow evaporation at room temperature. The compound 2C₆MnCl₄ was characterized by X-ray Powder Diffraction, Scanning Electron Microscopy, Energy Dispersive X-ray and UV-Visible spectroscopies. Single-crystal X-ray diffraction analysis performed at various temperatures (290, 250, 200, 160, and 150 K) reveals a structural phase transition occurring between 250 and 200 K. The optical measurements show that this hybrid material undergoes an indirect optical transition and presents an energy gap value of about 2.78 eV. The optical reflectance spectrum shows three absorption bands at 361, 422, and 507 nm. The computed band gap electronic was found to be about 2.75 eV which is in good agreement with the experimental value. The electronic total and partial density of states were calculated using density functional theory (DFT) to assess the various orbitals' contributions at the minimum conduction band and maximal valence band.

采用常温慢蒸发法制备了1,6 -二氨基己烷四氯锰酸盐（2C6MnCl4）杂化材料。采用x射线粉末衍射、扫描电镜、能量色散x射线和紫外可见光谱对化合物2C6MnCl4进行了表征。在不同温度（290、250、200、160和150 K）下进行的单晶x射线衍射分析显示，在250和200 K之间发生了结构相变。光学测量结果表明，该杂化材料发生了间接光学跃迁，能隙值约为2.78 eV。光学反射光谱在361、422和507 nm处有三个吸收带。计算得到的带隙电子值约为2.75 eV，与实验值吻合较好。利用密度泛函理论（DFT）计算了电子态的总密度和偏密度，评估了各轨道在最小导带和最大价带的贡献。

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引用次数: 0

The generalized hydrodynamic framework for the Sawada-Kotera equation and its kinetic equations Sawada-Kotera方程及其动力学方程的广义水动力框架

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A

Pub Date : 2026-04-15 Epub Date: 2026-01-16 DOI: 10.1016/j.physleta.2026.131355

Zhaoyan Xu

The concept of soliton gas has become well-known in recent years and the soliton gas has been studied by using various methods. The letter will approach this topic from a perspective of mathematical physics by constructing a Thermodynamic Bethe Ansatz model, treating N-soliton solutions of the Sawada-Kotera equation as N quasi-particles. As the number N of the solitons approaches infinity, the N-soliton system will evolve into a soliton gas of the Sawada-Kotera equation. By deriving the corresponding physical concepts, the kinetic equation associated with this soliton gas is derived immediately. This work will inspire the study of soliton gas of other physically important integrable systems.

近年来，孤子气体的概念逐渐为人所知，人们通过各种方法对孤子气体进行了研究。这封信将从数学物理的角度来探讨这个话题，通过构建一个热力学Bethe Ansatz模型，将Sawada-Kotera方程的N-孤子解视为N个准粒子。当N孤子的数目接近无穷大时，N孤子系统将演化为符合Sawada-Kotera方程的孤子气体。通过推导相应的物理概念，立即推导出与该孤子气体相关的动力学方程。这项工作将对其他物理上重要的可积系统的孤子气体的研究产生启发。

引用次数: 0

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