Physics Letters A最新文献

英文中文

Dynamically switchable spin-coupled and spin-decoupled metasurface based on vanadium dioxide 基于二氧化钒的动态可切换自旋耦合和自旋解耦超表面

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

Physics Letters A

Pub Date : 2025-12-06 DOI: 10.1016/j.physleta.2025.131242

Fan Gao , Chaoqun Li , Zhen Zhang , Yuhang Tu , Yonghang Yu , Xiaopeng Li , Bo Yan

Metasurfaces have rapidly advanced the manipulation of electromagnetic waves, particularly in independent phase and polarization control. However, most reported spin-decoupled metasurfaces mainly focus on efficient separation of circularly polarized (CP) components, while spin-coupled mechanisms remain less explored. In this study, a metasurface capable of dynamically switching between spin-coupled and spin-decoupled states under orthogonal CP incidence is proposed. While spin-decoupling of orthogonal CP waves is realized, the spin-coupled behavior is retained by leveraging the phase transition properties of vanadium dioxide (VO₂). Based on this mechanism, two independent tunable metasurface devices are designed: a bifunctional metasurface with reconfigurable focusing states and tunable focal length; and a multiple-channel vortex beam generator with switchable orbital angular momentum (OAM). The feasibility of the proposed framework has been validated, and broad application prospects of such reconfigurable and multifunctional devices are anticipated in areas including multi-channel optical communication systems, super-resolution imaging, and light-field imaging.

超表面迅速地推动了电磁波的操纵，特别是在独立的相位和极化控制方面。然而，大多数报道的自旋解耦超表面主要集中在圆极化（CP）组分的有效分离上，而自旋耦合机制的探索较少。在本研究中，提出了一种在正交CP入射下能够在自旋耦合和自旋解耦状态之间动态切换的超表面。在实现正交CP波的自旋去耦的同时，利用二氧化钒（VO 2）的相变特性保持了自旋耦合行为。基于该机制，设计了两个独立的可调超表面器件：具有可调焦状态和可调焦距的双功能超表面；以及具有可切换轨道角动量（OAM）的多通道涡旋光束发生器。验证了该框架的可行性，并展望了该可重构多功能器件在多通道光通信系统、超分辨率成像和光场成像等领域的广阔应用前景。

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引用次数: 0

The magneto-optical response of grey-dark doublet excitons in monolayer WSe2 单层WSe2中灰暗双重激子的磁光响应

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

Physics Letters A

Pub Date : 2025-12-06 DOI: 10.1016/j.physleta.2025.131212

Wen Liu , Fanhua Meng , Wenjing Min , Jiyong Fu

Dark excitons in monolayer transition metal dichalcogenide can be brightened by the magnetic field. Owing to the short-range exchange interaction δ, the degenerate dark excitons in different valleys evolve into grey-dark doublet. We perform a detailed investigation of the magneto-optical response of the grey-dark doublet in WSe₂ monolayers with our valley dynamic model, and obtain the photoluminescence (PL) intensities of the doublet in the presence of the in-plane magnetic field (B_||), which is in excellent agreement with the experimental data [2D Mater.4 (2017) 021003]. Significantly, due to the intrinsic δ, the external B_|| simultaneously incorporates bright excitons in different valleys into the grey-dark doublet, enabling separate description of valley polarization (VP) degrees for the doublet, which will provide more possibilities for quantum information processing using dark exctions. Moreover, the application of the out-of-plane field (B_z) can adjust the energy separation of the doublet, thus controlling their optical emission intensities. Besides, we reveal that the sign reversal of B_z can invert the VP of the dark states. Our results are helpful for manipulating the valley degree of freedom of dark exctions.

磁场可以使单层过渡金属二硫化物中的暗激子变亮。由于短程交换作用δ，不同谷的简并暗激子演化为灰-暗双重态。我们利用我们的谷动力学模型对WSe2单层中灰-暗双重态的磁光响应进行了详细的研究，并得到了双重态在面内磁场（B||）存在下的光致发光（PL）强度，与实验数据[2D材料，4(2017)021003]非常吻合。值得注意的是，由于固有的δ，外部B||同时将不同谷的亮激子合并到灰暗双激子中，使得双激子的谷极化（VP）度可以单独描述，这将为使用暗激子处理量子信息提供更多的可能性。此外，应用面外场（Bz）可以调节双光子的能量分离，从而控制其光发射强度。此外，我们还揭示了Bz的符号反转可以反转暗态的VP。我们的结果对暗激振的谷自由度的操纵有一定的帮助。

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引用次数: 0

Improving phase sensitivity of SU(1,1) interferometer using even and odd coherent states and squeezed vacuum state 利用奇偶相干态和压缩真空态提高SU（1,1）干涉仪的相位灵敏度

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

Physics Letters A

Pub Date : 2025-12-05 DOI: 10.1016/j.physleta.2025.131231

Abdelmajid El Maaroufi , Abbas Manan , Bouchra Maroufi , Mohammed Daoud , Saeed Haddadi

We investigate the phase sensitivity of an SU(1,1) interferometer by using nonclassical states. Specifically, both even and odd coherent states, as well as the squeezed vacuum state, are used as inputs. The interferometer setup includes two parametric optical amplifiers and a phase shifter. Intensity detection at the output port is used to measure phase estimation precision via the error propagation method under both ideal and photon loss cases. To quantify the ultimate bounds of phase estimation, we calculate the quantum Cramér-Rao bound using the quantum Fisher information technique. Our results show that the odd coherent state significantly enhances phase sensitivity compared to the even coherent state and the standard coherent state; this surpasses the standard quantum limit and approaches the Heisenberg limit in certain squeezing parameters. Furthermore, with a larger squeezing parameter, all schemes converge toward a similar phase sensitivity, consistent with the quantum Cramér-Rao bound predictions.

利用非经典态研究了SU（1,1）干涉仪的相位灵敏度。具体地说，奇偶相干态和压缩真空态都被用作输入。干涉仪装置包括两个参量光放大器和一个移相器。在理想情况和光子损失情况下，通过误差传播法测量输出端口的强度检测来测量相位估计精度。为了量化相位估计的极限界，我们利用量子费雪信息技术计算了量子cram - rao界。结果表明，奇相干态比偶相干态和标准相干态显著提高了相灵敏度；这超过了标准量子极限，在某些压缩参数下接近海森堡极限。此外，当压缩参数较大时，所有方案都收敛于相似的相位灵敏度，这与量子cram r- rao界预测一致。

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引用次数: 0

Dynamic control of optical nonreciprocity through nonlinear process induced by photoisomerization 光异构化非线性过程对光学非互易的动态控制

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

Physics Letters A

Pub Date : 2025-12-04 DOI: 10.1016/j.physleta.2025.131224

Xu Guo , Jianming Mai , Qiaofeng Dai , Kok Wai Cheah , Zhuo Wang , Zhongchao Wei , Haihua Fan

Dynamic control of optical nonreciprocity is crucial for optical communication. This work theoretically demonstrates a dynamic optical nonreciprocal control using a dual resonance microcavities. The dual resonance microcavities is a non-Hermitian heterostructure with one cavity containing photoisomerizable molecules while the second cavity is passive. The system achieves low-power nonreciprocal transmission through trans-cis isomerization-induced refractive index modulation. Theoretical analysis reveals that light-controlled isomeric index changes induce quasi-static optical bistability, with nonlinear saturation thresholds strongly dependent on incident polarization and external pumping. A broad range of photoisomerizable molecules offers a wide range of index modulation time, from picosecond to microsecond, that means a broad temporal range in dynamic control of nonreciprocity. Notably, the system enables reversible switching of optical isolation direction via polarization control and external pumping. This work establishes a new paradigm for active nonreciprocal control in dissipative systems, with promising applications in reconfigurable optical isolators and nonlinear photonic memories.

光非互易的动态控制是光通信的关键。这项工作从理论上证明了利用双共振微腔的动态光学非互反控制。双共振微腔是一种非厄米异质结构，其中一个腔含有光异构分子，而另一个腔是被动的。该系统通过顺式异构化诱导折射率调制实现低功率非互反传输。理论分析表明，光控的同分异构体折射率变化引起准静态光双稳性，非线性饱和阈值强烈依赖于入射偏振和外泵浦。广泛的光异构分子提供了广泛的指数调制时间范围，从皮秒到微秒，这意味着在动态控制非互易方面具有广泛的时间范围。值得注意的是，该系统通过偏振控制和外部泵浦实现了光隔离方向的可逆切换。这项工作为耗散系统中的主动非互反控制建立了一个新的范例，在可重构光隔离器和非线性光子存储器中有很好的应用前景。

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引用次数: 0

Analytical description of the light intensity distribution in the model of the gradient photonic crystal structure and non-Kerr nonlinearity 梯度光子晶体结构和非克尔非线性模型中光强分布的解析描述

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

Physics Letters A

Pub Date : 2025-12-04 DOI: 10.1016/j.physleta.2025.131234

S.E. Savotchenko

New model of the waveguide structure based on the graded-index photonic crystal structure with attenuating refractive index with a distance and nonlinear crystal with the Kerr-type nonlinear response disappearing with an increase in the light intensity is proposed. Both cases of the sign of the Kerr nonlinearity coefficient corresponding to the disappearance of self-focusing and defocusing nonlinearity are considered. New exact solutions to the nonlinear contact boundary problem in explicit form are found. The light intensity distribution using obtained exact analytical solutions are described and analyzed with variation of the optic structure parameters. Two types of the transverse distribution of the light intensity corresponding to the surface wave characterized by one maximum, and monotonic attenuation in field with a distance from the interface and the waveguide modes characterized by several intensity peaks formed in graded-index photonic crystal structure are described by obtained exact solutions. It is shown that formation of the waveguide modes occurs with an increase in the interface dielectric constant.

基于折射率随距离衰减的梯度折射率光子晶体结构和克尔型非线性响应随光强增加而消失的非线性晶体，提出了一种新的波导结构模型。考虑了克尔非线性系数的符号与自聚焦和离焦非线性的消失相对应的两种情况。给出了非线性接触边界问题新的精确显式解。利用得到的精确解析解描述并分析了光强分布随光学结构参数的变化。得到的精确解描述了两种类型的光强横向分布，对应于具有一个最大值的表面波，以及场中随界面距离的单调衰减，以及梯度折射率光子晶体结构中形成的以多个强度峰为特征的波导模式。结果表明，波导模式的形成随界面介电常数的增加而发生。

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引用次数: 0

Symmetry-controlled photogalvanic spin currents in chromium porphyrin dimers 铬卟啉二聚体中对称控制的光电自旋电流

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

Physics Letters A

Pub Date : 2025-12-04 DOI: 10.1016/j.physleta.2025.131229

Qingyu Shao, Xiaojie Liu, Lifeng Feng, Haitao Yin

The photogalvanic effect (PGE) provides a unique platform for integrating optoelectronic and spintronic functionalities at the nanoscale. In this study, we systematically investigate spin-dependent photocurrent generation in a chromium porphyrin dimer (Cr₂Por₂) molecular junction with intrinsic inversion symmetry, comparing its PGE response before and after NO₂ adsorption. While the Cr₂Por₂ system exhibits no net charge photocurrent in either parallel (PC) or antiparallel (APC) magnetic configurations of the porphyrin dimer, the APC generates stable pure spin current due to its distinct spin asymmetry. NO₂ adsorption breaks the central inversion symmetry, inducing a highly spin-polarized photocurrent in PC while preserving the APC's capability to produce pure spin current at selected photon energies. Remarkably, in the symmetry-broken state by NO₂ adsorption, the PC demonstrates a significantly enhanced photocurrent extinction ratio compared to the APC. These results establish key design principles for molecular spin-optoelectronic devices through strategic symmetry manipulation and spin configuration engineering.

光电效应（PGE）为在纳米尺度上集成光电和自旋电子功能提供了一个独特的平台。在这项研究中，我们系统地研究了具有本征倒置对称性的铬卟啉二聚体（Cr2Por2）分子结中自旋相关光电流的产生，比较了其吸附NO2前后的PGE响应。而Cr2Por2体系在卟啉二聚体的平行（PC）或反平行（APC）磁结构中均不表现出净电荷光电流，而APC由于其明显的自旋不对称性而产生稳定的纯自旋电流。NO2吸附打破了中心反转对称，在PC中产生高度自旋极化的光电流，同时保留了APC在选定光子能量下产生纯自旋电流的能力。值得注意的是，在NO2吸附的对称破缺状态下，PC的光电流消光比明显高于APC。这些结果通过战略性对称操纵和自旋组态工程建立了分子自旋光电器件的关键设计原则。

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引用次数: 0

On local unitary equivalence and local permutation equivalence of bipartite quantum states under permutation transformations 置换变换下二部量子态的局部酉等价和局部置换等价

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

Physics Letters A

Pub Date : 2025-12-03 DOI: 10.1016/j.physleta.2025.131223

Mengli Liu, Yanjun Chu, Keke Zhang, Yuhang Xie, Chenyang Cui

Local unitary equivalence plays a pivotal role in both the quantification and categorization of entanglement within quantum states. However, determining whether two bipartite quantum states are local unitary equivalent remains a notably challenging problem. In this work, we establish that for arbitrary bipartite quantum states that are permutation equivalent, local unitary equivalence coincides with local permutation equivalence. Leveraging the spectral decomposition form of quantum states, we prove that local unitary equivalence and local permutation equivalence are identical for permutation-equivalent bipartite quantum states, demonstrating that their local unitary equivalence is also equivalent to local permutation equivalence. Our findings provide a streamlined approach to determining local unitary equivalence for permutation-equivalent bipartite quantum states. Additionally, we present several illustrative examples to verify the feasibility and effectiveness of the proposed method.

局部幺正等价在量子态内纠缠的量化和分类中起着关键作用。然而，确定两个二部量子态是否局部幺正等价仍然是一个非常具有挑战性的问题。在本工作中，我们建立了任意二部量子态的置换等价，局部酉等价与局部置换等价重合。利用量子态的谱分解形式，证明了置换等价二部量子态的局部酉等价和局部置换等价是相同的，并证明了它们的局部酉等价也等价于局部置换等价。我们的发现提供了一种简化的方法来确定置换等效二部量子态的局部幺正等价。此外，我们还给出了几个示例来验证所提出方法的可行性和有效性。

引用次数: 0

Electron heating in bulk overdense plasma aided by time dependent external magnetic field 随时间变化的外加磁场辅助下体超密等离子体中的电子加热

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

Physics Letters A

Pub Date : 2025-12-03 DOI: 10.1016/j.physleta.2025.131218

Rohit Juneja, Trishul Dhalia, Amita Das

This study investigates the localized electron heating in a bulk overdense plasma. The method relies on using a time dependent magnetic field. An initially high external magnetic field imposed on the overdense plasma target enables the propagation of a laser pulse inside it through the passbands that occur in the magnetized dispersion relation. The choice of decaying external magnetic field is then tailored appropriately to achieve Electron Cyclotron Resonance (ECR) with the frequency of the laser electromagnetic field. At the resonance location, the field energy of the laser gets transferred to the electrons. These studies have been carried out with the help of the Particle-In-Cell (PIC) simulation technique on the OSIRIS4.0 platform. A detailed study has been carried out to illustrate the energy gain by electrons for a variety of temporal profiles of the magnetic field, laser intensities, and polarizations. The experiments in this regime may be within reach in the near future. For instance, the choice of long-wavelength CO₂ laser requires a magnetic field of about 10s of kilo Tesla to comfortably elicit a magnetized response from electrons. Recent technological advancements have shown the generation of about 1.4 kilo Tesla of magnetic field.

本文研究了大块过密等离子体中的局域电子加热。该方法依赖于使用随时间变化的磁场。施加在过密等离子体目标上的初始高外部磁场使激光脉冲能够通过磁化色散关系中的通带在其内部传播。在此基础上，适当选择衰减外磁场，实现与激光电磁场频率一致的电子回旋共振（ECR）。在共振位置，激光的场能量被转移到电子上。这些研究是借助OSIRIS4.0平台上的颗粒-细胞（PIC）模拟技术进行的。详细的研究已经进行，以说明各种时间分布的磁场，激光强度，和极化电子的能量增益。在不久的将来，这种制度的实验可能是触手可及的。例如，选择长波长的CO2激光器需要大约10s千特斯拉的磁场，才能轻松地引起电子的磁化响应。最近的技术进步表明，产生大约1.4千克特斯拉的磁场。

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引用次数: 0

Entanglement and optimal timing in discriminating quantum dynamical processes 鉴别量子动力学过程中的纠缠和最佳定时

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

Physics Letters A

Pub Date : 2025-12-03 DOI: 10.1016/j.physleta.2025.131199

Massimiliano F. Sacchi

I study the problem of optimally discriminating between two open quantum dynamical processes in a single-shot scenario, with the aim of minimizing the error probability of identification. This task requires jointly optimising the input state—potentially entangled with an ancillary system isolated from the dynamics—and the time at which the resulting time-dependent quantum channels, generated by the two dynamical maps, are most distinguishable. As an illustrative case, I focus on Pauli dynamical maps and their associated families of time-dependent Pauli channels. I identify a regime in which separable strategies require waiting indefinitely until the dynamics reaches the stationary state, whereas entangled input states enable optimal discrimination at a finite time, with a strict reduction in error probability. These results highlight the crucial interplay between entanglement and timing in enhancing the distinguishability of quantum dynamical processes.

我研究了单发场景下两个开放量子动力学过程的最优判别问题，目的是使识别的错误概率最小化。这项任务需要共同优化输入状态——可能与一个与动态隔离的辅助系统纠缠在一起——以及由两个动态映射产生的与时间相关的量子通道最容易区分的时间。作为一个说明性的案例，我将重点放在泡利动态映射及其相关的时变泡利通道族上。我确定了一种制度，其中可分离策略需要无限期等待，直到动态达到静止状态，而纠缠输入状态能够在有限时间内实现最佳识别，并严格减少错误概率。这些结果强调了纠缠和时间在增强量子动力学过程的可分辨性方面的关键相互作用。

引用次数: 0

Phase alignment in a lattice of exciton-polaritonic Bose-Einstein condensates 激子-极化玻色-爱因斯坦凝聚体晶格中的相位排列

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

Physics Letters A

Pub Date : 2025-12-03 DOI: 10.1016/j.physleta.2025.131221

N.V. Kuznetsova , D.V. Makarov , N.A. Asriyan , A.A. Elistratov

Dynamics of exciton-polariton Bose-Einstein condensate is examined by means of the stochastic Gross-Pitaevskii equation including non-Markovian coupling to the excitonic reservoir. Attention is concentrated on properties of the condensate lattice created by laser beams providing incoherent pumping of the reservoir. It is shown that phase ordering of the lattice depends on temperature. The crossover between the in-phase (“ferromagnetic”) and the checkerboard (“antiferromagnetic”) orders is accompanied by variation of the steady-state condensate density. Also it is shown that the condensate lattices can retain ordered pattern for temperatures which are much higher than the critical temperature of a single spot, probably due to suppression of the modulational instability.

利用随机Gross-Pitaevskii方程，包括与激子库的非马尔可夫耦合，研究了激子-极化子玻色-爱因斯坦凝聚体的动力学。重点研究了激光对储层进行非相干抽运所产生的凝析晶格的性质。结果表明，晶格的相序与温度有关。同相（“铁磁”）阶和棋盘（“反铁磁”）阶之间的交叉伴随着稳态凝析密度的变化。在远高于单点临界温度的温度下，冷凝晶格仍能保持有序模式，这可能是由于抑制了调制不稳定性。

引用次数: 0

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