Physics Letters A最新文献

英文中文

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 : 2026-01-24 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

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 : 2026-01-24 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

Type-III Dirac fermions in a two-dimensional carbon allotrope with extremely high mechanical strength 二维碳同素异形体中的iii型狄拉克费米子具有极高的机械强度

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

Physics Letters A

Pub Date : 2026-01-24 DOI: 10.1016/j.physleta.2026.131416

Juan Wei , Fangxiu Xue , Bing Lv , Weiwei Xu , Xue Chen , Jing Chen , Weixiang Kong

引用次数: 0

Investigation of high energy density InN₆ compounds under high pressure 高压力下高能量密度n₆化合物的研究

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

Physics Letters A

Pub Date : 2026-01-24 DOI: 10.1016/j.physleta.2026.131415

Yongju Dang , Xing Sun , Haizhou Wang, Jinyu Liu, Dandan Zhang, Lili Gao, Miao Zhang

High energy density materials (HEDMs) are crucial in explosives and energy storage fields. The conversion of N-N and N=N bonds to NN is associated with substantial energy release, and polymeric nitrogen stands out as a promising HEDMs candidate owing to its abundant N-N and N=N bonds. However, polymeric nitrogen typically exhibits poor stability under ambient conditions. Applying high pressure and introducing coordinating elements are two proven strategies to enhance its stability. Herein, we explored the InN₆ compounds via crystal structure prediction approach and identify two dynamically stable phases within the pressure range of 0 - 100 GPa. Notably, the ɑ-P-1-InN₆ phase demonstrates exceptional performance, featuring a high volumetric energy density (E_v = 18.33 kJ/cm³), high detonation pressure (P_d = 264.96 GPa), and superior detonation velocity (V_d = 34.57 km/s). These outstanding properties endow ɑ-P-1-InN₆ with great application potential in energy storage and explosive manufacturing.

高能量密度材料在炸药和储能领域具有重要意义。N-N和N=N键向NN的转化与大量的能量释放有关，聚合物氮因其丰富的N-N和N=N键而成为有前途的HEDMs候选者。然而，聚合氮在环境条件下通常表现出较差的稳定性。施加高压和引入协调元件是提高其稳定性的两种行之有效的策略。在此，我们通过晶体结构预测方法探索了InN6化合物，并在0 - 100 GPa的压力范围内确定了两个动态稳定的相。其中，具有较高的体积能量密度（Ev = 18.33 kJ/cm3）、较高的爆轰压力（Pd = 264.96 GPa）和较高的爆轰速度（Vd = 34.57 km/s）。这些优异的性能赋予了ni -P-1-InN6在储能和炸药制造方面具有巨大的应用潜力。

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引用次数: 0

Unipolar half-cycle light emission from strong-field driven atoms 强场驱动原子的单极半周期光发射

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

Physics Letters A

Pub Date : 2026-01-24 DOI: 10.1016/j.physleta.2026.131398

Rostislav Arkhipov, Mikhail Arkhipov, Nikolay Rosanov

We demonstrate that a single atom can act as an elementary source of half-cycle light, unveiling the fundamental mechanism behind unipolar pulse generation. By solving the time-dependent Schrödinger equation, we show that an intense single-cycle optical pulse triggers a “femtosecond dipole switch”: the leading half-wave causes a sudden jump of the atomic dipole via tunneling ionization, while the trailing half-wave induces its a slow reduction via electron rescattering. This two-step process directly maps the sub-cycle field dynamics onto a quasi-unipolar electromagnetic transient, establishing strong-field recollision as a primary building block for attosecond half-cycle optical field synthesis.

我们证明了单个原子可以作为半周期光的基本光源，揭示了单极脉冲产生背后的基本机制。通过求解与时间相关的Schrödinger方程，我们证明了强烈的单周期光脉冲触发“飞秒偶极子开关”：前半波通过隧穿电离引起原子偶极子的突然跳跃，而后半波通过电子重散射诱导其缓慢还原。这两步过程直接将子周期场动力学映射到准单极电磁瞬变，建立强场回忆作为阿秒半周期光场合成的主要组成部分。

引用次数: 0

Moiré-enabled continuously tunable beam steering in cascaded all-dielectric terahertz metasurfaces 在级联的全介电太赫兹超表面中，moirsamac驱动的连续可调谐光束导向

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

Physics Letters A

Pub Date : 2026-01-24 DOI: 10.1016/j.physleta.2026.131414

Qing Zeng , Wenhui Xu , Hang Xu , Hui Li , Jianquan Yao

Dynamically reconfigurable metasurfaces for terahertz (THz) wavefront control are highly desirable for advanced communication, imaging, and sensing systems. Here, we propose a cascaded all-dielectric metasurface that enables continuously tunable beam steering through a Moiré phase-superposition mechanism. Two closely stacked 2-bit silicon coding layers generate programmable composite phase profiles under relative mechanical rotation. Counter-rotation produces a one-dimensional effective phase gradient, allowing continuous single-beam steering within ±50° at the design frequency in the yoz plane, whereas only single-layer rotation produces coupled x-y phase gradients, thereby enabling two-dimensional steering with an azimuthal tuning range of ±45°. The simulated steering characteristics exhibit excellent agreement with analytical predictions, with consistently high transmission efficiency and stable main-lobe amplitude across the full tuning range. This compact and reconfigurable cascaded architecture provides an efficient route toward wide-range, continuous, and high-performance THz beam manipulation via simple mechanical actuation.

用于太赫兹（THz）波前控制的动态可重构元表面对于先进的通信、成像和传感系统是非常理想的。在这里，我们提出了一个级联的全介电超表面，使连续可调谐的光束转向通过莫尔维尔相位叠加机制。两个紧密堆叠的2位硅编码层在相对机械旋转下生成可编程的复合相位曲线。反旋转产生一维有效相位梯度，允许在z面以设计频率在±50°范围内连续单光束转向，而单层旋转产生耦合的x-y相位梯度，从而实现二维定向，方位角调谐范围为±45°。模拟的转向特性与分析预测非常吻合，在整个调谐范围内具有一贯的高传输效率和稳定的主瓣振幅。这种紧凑且可重构的级联结构通过简单的机械驱动为大范围、连续和高性能的太赫兹波束操作提供了有效的途径。

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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 : 2026-01-23 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

Solitons of the symmetric ϕ4−ϕ2|ϕ|−ϕ2 triple well model 对称的ϕ4−ϕ2| φ |−ϕ2三井模型的孤子

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

Physics Letters A

Pub Date : 2026-01-22 DOI: 10.1016/j.physleta.2026.131392

Avinash Khare , Avadh Saxena

A symmetric

ϕ^{4} - ϕ^{2} | ϕ | - ϕ^{2}

model has recently attracted attention due to its usefulness in studying tunable phase transitions. We analyze the behavior of this model for the entire range of parameters and obtain its kink and pulse solutions. For completeness, we also present several periodic solutions of this model. Furthermore, we present a generalized symmetric

ϕ^{4 n} - ϕ^{2 n} | ϕ | - ϕ^{2}

model where

n = 1, 2, 3, \dots

and obtain its kink and pulse solutions for arbitrary n.

对称的ϕ4−ϕ2| φ |−ϕ2模型最近因其在研究可调谐相变方面的有用性而引起了人们的注意。我们分析了该模型在整个参数范围内的行为，得到了它的扭结解和脉冲解。为了完备性，我们还给出了该模型的几个周期解。在此基础上，提出了一个广义对称的n=1,2,3，…的模型，并得到了任意n下的扭结解和脉冲解。

引用次数: 0

Dual-narrowband terahertz absorber with independently tunable amplitude and frequency: A theoretical study 幅频可调双窄带太赫兹吸收器的理论研究

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

Physics Letters A

Pub Date : 2026-01-21 DOI: 10.1016/j.physleta.2026.131395

Hao Fu, Fang Chen

A hybrid molybdenum disulfide (MoS₂) and strontium titanate (STO) metamaterial absorber is presented for the terahertz band, enabling dynamic tuning of absorption properties via both electrical and thermal stimuli. The absorber features a multilayer architecture comprising a gold substrate, a SiO₂ dielectric spacer, an elliptical cross_shaped MoS₂ resonant layer, and an STO thin film. It achieves dual narrowband perfect absorption at 0.25 THz and 1.30 THz, with absorptances of 99.09 % and 99.72 %, respectively. Research findings indicate that the absorptance of the first absorption peak can be independently modulated by adjusting the carrier concentration of MoS₂. As the carrier concentration increases from 1 × 10¹³ cm^-2 to 1 × 10¹⁵ cm^-2, the absorptance rises from 62.33 % to 99.09 %, yielding a modulation depth of 37.09 %. Independent tuning of the resonance frequencies is achieved by adjusting temperature: heating from 250 K to 500 K induces a blue shift of the absorption spectrum, with temperature sensitivities of 0.43 GHz/K and 2.24 GHz/K for the two peaks, respectively. The absorption spectra obtained through coupled mode theory (CMT) and the equivalent circuit model (ECM) exhibit excellent agreement with the simulation results. Electromagnetic field and current distributions elucidate the independent tuning mechanism of the absorber. Additionally, the absorber demonstrates polarization-insensitive characteristics and wide-angle incidence stability, showing promising application prospects in fields such as biochemical sensing, optical switching, and modulation.

提出了一种用于太赫兹波段的二硫化钼（MoS2）和钛酸锶（STO）混合超材料吸收体，通过电和热刺激实现吸收特性的动态调谐。该吸收器具有多层结构，包括金衬底，SiO2介电间隔层，椭圆十字形MoS2谐振层和STO薄膜。在0.25 THz和1.30 THz处实现双窄带完美吸收，吸光度分别为99.09%和99.72%。研究结果表明，第一吸收峰的吸光度可以通过调节二硫化钼的载流子浓度来独立调节。当载流子浓度从1 × 1013 cm-2增加到1 × 1015 cm-2时，吸光度从62.33%增加到99.09%，调制深度为37.09%。通过调节温度可以实现共振频率的独立调谐：从250 K加热到500 K会引起吸收光谱的蓝移，两个峰的温度灵敏度分别为0.43 GHz/K和2.24 GHz/K。通过耦合模理论（CMT）和等效电路模型（ECM）得到的吸收光谱与仿真结果吻合良好。电磁场和电流分布说明了吸收器的独立调谐机制。此外，该吸收剂具有极化不敏感特性和广角入射稳定性，在生物化学传感、光开关和调制等领域具有广阔的应用前景。

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引用次数: 0

Crystallographic exploration of copper nanocrystal by X-ray and selected area electron diffraction pattern: High resolution transmission electron microscopy insight 用x射线和选定区域电子衍射图对铜纳米晶体的晶体学探索：高分辨率透射电子显微镜的见解

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

Physics Letters A

Pub Date : 2026-01-20 DOI: 10.1016/j.physleta.2026.131391

Md. Ashraful Alam, Raton Kumar Bishwas, Fariha Zannat, Shirin Akter Jahan

Highly crystalline copper nanoparticles (Cu NPs) were characterized by X-ray diffraction (XRD), showing prominent diffraction peaks at 2θ= 43.4331 (111), 50.5531 (200) and 74.2090º (220) consistent with a face-centered cubic (FCC) crystal structure. Rietveld refinement yielded lattice parameters a=b=c= 3.612 Å; α=β=γ= 90.00 °, lattice volume 47.142 Å³ and strain 0.137 % with excellent pattern fitting [Rwp, % 9.19; Rp, % 6.47; S, 1.4007; χ², 1.9604]. Optical analysis showed a maximum absorbance at 338.30 nm and a bandgap of 4.33 eV, reflecting a blue shift and strong surface plasmon resonance. Dynamic light scattering (DLS) and zeta potential (72.74 mV) confirmed uniform colloidal dispersion and high stability. Transmission electron microscopy (TEM) and HR-TEM analyses revealed particle size of 39 to 48 nm, uniform growth and d ₍₁₁₁₎ spacing of 0.208 nm and 0.180 nm for d ₍₂₀₀₎ while selected area electron diffraction (SAED) patterns and energy dispersive spectroscopy (EDS) confirmed highly pure FCC Cu crystal up to 89.20 %. The vibrating sample magnetometer (VSM) revealed remnant mass magnetization of 0.000988991327703507 emu/g, indicating weak magnetic behavior. These structural, morphological and optical features highlight the potential of Cu NPs for applications in antimicrobial coatings, sensing and catalysis while further investigations are required to evaluate their biocompatibility and performance under real-world conditions.

采用x射线衍射（XRD）对高结晶铜纳米粒子（Cu NPs）进行了表征，在2θ= 43.4331（111）、50.5531（200）和74.2090º（220）处有明显的衍射峰，符合面心立方（FCC）晶体结构。Rietveld细化得到晶格参数a=b=c= 3.612 Å；α=β=γ= 90.00°，晶格体积47.142 Å³，应变0.137 %，模式拟合良好[Rwp， % 9.19；Rp, % 6.47；年代,1.4007;χ²,1.9604]。光学分析表明，该材料的最大吸光度为338.30 nm，带隙为4.33 eV，反映了蓝移和强烈的表面等离子体共振。动态光散射（DLS）和zeta电位（72.74 mV）证实胶体分散性均匀，稳定性高。透射电子显微镜（TEM）和红外透射电子显微镜（hrtem）分析显示，FCC铜晶体的粒径为39 ~ 48 nm，生长均匀，d（111）间距为0.208 nm和0.180 nm (d(200))，选择区域电子衍射（SAED）和能谱分析（EDS）证实FCC铜晶体纯度高达89.20%。振动样品磁强计（VSM）显示残余质量磁化强度为0.000988991327703507 emu/g，表明磁化行为较弱。这些结构、形态和光学特征突出了Cu NPs在抗菌涂层、传感和催化方面的应用潜力，但需要进一步研究以评估其在现实条件下的生物相容性和性能。

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引用次数: 0

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