Annalen der Physik最新文献

{"title":"Multi-Layer Dielectric Metasurface Antenna With Modal Separation Behavior for Broadband Circular Polarization and High Gain","authors":"Chun Ni,&nbsp;Junqi Chen,&nbsp;Hui Wang,&nbsp;Meng Kong,&nbsp;Chenghua Fan,&nbsp;Liang Zhang,&nbsp;Zhongxiang Zhang","doi":"10.1002/andp.70306","DOIUrl":"https://doi.org/10.1002/andp.70306","url":null,"abstract":"<div>\u0000 \u0000 <p>A multi-layer dielectric metasurface antenna exploiting the modal separation effect analyzed via characteristic mode analysis (CMA) is proposed. The metasurface is composed of a 3 × 4 array of rectangular patches and is designed on the top of a cardboard box with a thickness of 3.5 mm. Research demonstrates that a set of fundamental modes of the rectangular patch array are separated in the frequency domain. When this separation state reaches an adequate level, a 90-degree phase difference will be generated between two of these modes. If these two modes are excited simultaneously, due to the 90-degree phase difference and the wide frequency shift between the two modes, a relatively wide axial ratio bandwidth for circular polarization can be achieved. The radiating element of this antenna is a square patch with chamfered corners. Studies indicate that this radiating element is capable of exciting this set of separated fundamental modes of the metasurface simultaneously. Moreover, the inside of the cardboard box of the metasurface is empty, and the substrate of the radiating element is FR4. This combination of multi-layer dielectric provides a new attempt to expand the bandwidth and enhance the gain.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 10","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Entropy and Variance Squeezing of a V-Type Atom","authors":"Zijin Liang,&nbsp;Qiying Pan,&nbsp;Hong-Mei Zou,&nbsp;Chenrui Bi","doi":"10.1002/andp.70294","DOIUrl":"https://doi.org/10.1002/andp.70294","url":null,"abstract":"<div>\u0000 \u0000 <p>Motivated by the demand for ultra-low-noise atomic states in quantum physics, we investigate the squeezing effects of a V-type atom in a dissipative cavity. We derive the analytical expressions for entropy and variance squeezing and explore their dynamic dependence on crucial physical parameters, including the atomic initial state, spontaneously generated interference (SGI), cavity–environment coupling, and atom–cavity detuning. The numerical results show that only the <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mi>x</mi>\u0000 </msub>\u0000 <annotation>$S_x$</annotation>\u0000 </semantics></math> entropy squeezing can emerge and vanish in the course of time evolution, whereas no other form of atomic squeezing can be observed for real-coefficient atomic initial states. Weak coupling can enhance the robustness of the <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mi>x</mi>\u0000 </msub>\u0000 <annotation>$S_{x}$</annotation>\u0000 </semantics></math> entropy squeezing more effectively than strong coupling. SGI exerts a slight influence on the <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mi>x</mi>\u0000 </msub>\u0000 <annotation>$S_{x}$</annotation>\u0000 </semantics></math> entropy squeezing. Detuning can effectively prolong the lifetime of the <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mi>x</mi>\u0000 </msub>\u0000 <annotation>$S_{x}$</annotation>\u0000 </semantics></math> entropy squeezing. Entropy squeezing quantifies quantum fluctuations more precisely than variance squeezing. These findings are valuable for quantum information processing as an ultra-low-noise resource.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 10","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Issue Information: Ann. Phys. 10/2026","authors":"","doi":"10.1002/andp.70304","DOIUrl":"https://doi.org/10.1002/andp.70304","url":null,"abstract":"","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 10","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70304","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Driven Magnon–Photon System as a Tunable Quantum Heat Rectifier","authors":"C. O. Edet,&nbsp;K. Słowik,&nbsp;N. Ali,&nbsp;O. Abah","doi":"10.1002/andp.70290","DOIUrl":"https://doi.org/10.1002/andp.70290","url":null,"abstract":"<div>\u0000 \u0000 <p>Controlling heat flow at the quantum level is a key challenge for next-generation quantum technologies, including thermal management and quantum information processing. Here, we investigate quantum heat transport in an asymmetrically driven hybrid magnon–photon system in contact with two thermal baths at different temperatures. We demonstrate that external driving of the magnonic subsystem provides a versatile control knob for tailoring steady-state heat currents and their asymmetry. We identify the mechanisms governing thermal rectification in the hybrid system: we find that strong rectification emerges in the regime of weak magnon–photon hybridization combined with intense magnon driving. In this regime, the external drive enables control over both the magnitude and direction of the heat current, allowing the rectification parameter to be tuned across its entire physically accessible range.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149048018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topology-Inverted Mapping: From Optical-Energy Flow to Inverse-Faraday Magnetization","authors":"Zhilong Zhou,&nbsp;Jiayang Wu,&nbsp;Han Lin,&nbsp;Baohua Jia","doi":"10.1002/andp.70300","DOIUrl":"https://doi.org/10.1002/andp.70300","url":null,"abstract":"<p>We report a previously unexplored topology-inverted mapping from optical energy-flow to inverse-Faraday magnetization in nonparaxially focused circularly polarized vortex beams. Both optical energy-flow and inverse-Faraday magnetization exhibit well-defined vector-field topologies in the focal region. The normalized magnetization field reproduces the optical energy-flow topology with reversed orientation. Local and global topological analyses reveal robust inversion of both the normalized vector-field topology and the topological charge. The corresponding inversion relations <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>n</mi>\u0000 <mi>S</mi>\u0000 </msub>\u0000 <mo>≈</mo>\u0000 <mo>−</mo>\u0000 <msub>\u0000 <mi>n</mi>\u0000 <mi>M</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>${{n}_S} approx - {{n}_M}$</annotation>\u0000 </semantics></math> and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>Q</mi>\u0000 <mi>S</mi>\u0000 </msub>\u0000 <mo>≈</mo>\u0000 <mo>−</mo>\u0000 <msub>\u0000 <mi>Q</mi>\u0000 <mi>M</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>${{Q}_S} approx - {{Q}_M}$</annotation>\u0000 </semantics></math> remain valid over the ranges of numerical apertures and orbital angular momentum orders investigated. This topology-inverted mapping establishes a theoretical framework linking optical topology to light-induced magnetic topology. It may provide new opportunities for the topology-guided engineering of structured magnetization and spin textures.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70300","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149048017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Entanglement, Space–Time Coordinates, and Bell's Inequalities in Photon–Polarization Experiments","authors":"Karl Hess,&nbsp;Jürgen Jakumeit","doi":"10.1002/andp.70299","DOIUrl":"https://doi.org/10.1002/andp.70299","url":null,"abstract":"<p>This work presents a revised analysis and corresponding perspective of Bell-type inequalities and their connection to entanglement in polarization experiments with single-photon resolution. It is argued that standard derivations of Bell-type inequalities implicitly rely on additional assumptions beyond those originally stated, specifically concerning the cardinalities of the sets of measurements and the sets of photon-pair properties (Einstein's elements of physical reality, Bell's <span></span><math>\u0000 <semantics>\u0000 <mi>λ</mi>\u0000 <annotation>$lambda $</annotation>\u0000 </semantics></math>). Any model-based averages must depend on these cardinalities and violations of Bell-type inequalities become possible for certain ranges of them. In addition, we argue that for Aspect-type experiments, the statistical properties associated with Bell's (hidden variable) λ can be different before and after actual photon-transmission through the polarizers. This distinction is particularly necessary for the actual equipment used in the Aspect-type experiments. Building on these observations, we construct a model based on a consistent evaluation of the measurement events relative to each other. The model reproduces all quantum-mechanical expectation values for polarization correlations without invoking instantaneous influences at a distance, and additionally yields explicit outcomes for individual photon-pair measurements. Within this framework, our Einstein-type Global Space-Time Model (GSTM) accounts also for polarization correlations in Malus-type experiments and addresses all commonly discussed paradoxes associated with single-photon measurements.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70299","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ab Initio Path Integral Monte Carlo Study of the 2D Uniform Electron Liquid at Finite Temperatures: Structural Properties, Density Response and Roton-Type Excitation","authors":"Tobias Dornheim,&nbsp;Fotios Kalkavouras,&nbsp;Paul Hamann,&nbsp;Zhandos A. Moldabekov,&nbsp;Jan Vorberger,&nbsp;Panagiotis Tolias","doi":"10.1002/andp.70293","DOIUrl":"https://doi.org/10.1002/andp.70293","url":null,"abstract":"<p>We present extensive ab initio path integral Monte Carlo (PIMC) simulations of the two-dimensional uniform electron gas (2DEG), covering a broad range of density parameters <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>r</mi>\u0000 <mi>s</mi>\u0000 </msub>\u0000 <mo>=</mo>\u0000 <mn>0.1</mn>\u0000 <mo>,</mo>\u0000 <mi>⋯</mi>\u0000 <mo>,</mo>\u0000 <mn>50</mn>\u0000 </mrow>\u0000 <annotation>$r_s=0.1,dots,50$</annotation>\u0000 </semantics></math> and temperatures <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Θ</mi>\u0000 <mo>=</mo>\u0000 <msub>\u0000 <mi>k</mi>\u0000 <mi>B</mi>\u0000 </msub>\u0000 <mi>T</mi>\u0000 <mo>/</mo>\u0000 <msub>\u0000 <mi>E</mi>\u0000 <mi>F</mi>\u0000 </msub>\u0000 <mi>e</mi>\u0000 <mi>r</mi>\u0000 <mi>m</mi>\u0000 <mi>i</mi>\u0000 <mo>=</mo>\u0000 <mn>0.5</mn>\u0000 <mo>,</mo>\u0000 <mi>⋯</mi>\u0000 <mo>,</mo>\u0000 <mn>16</mn>\u0000 </mrow>\u0000 <annotation>$Theta =k_textnormal {B}T/E_textnormal {Fermi}=0.5,dots,16$</annotation>\u0000 </semantics></math>. This allows us to analyze various structural, linear density response and spectral properties. We find clear evidence of a <i>roton-type</i> feature in the dynamic structure factor at strong coupling and intermediate wavenumbers. We also benchmark novel dielectric theory implementations for the 2DEG [Kalkavouras et al. arXiv:2601.14989] for structural and spectral properties across the liquid phase diagram. The PIMC results can be used to benchmark existing theories and approximations, and guide the development of new methodologies.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70293","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Power-Law Cosmology in Non-Minimally Coupled \u0000 \u0000 \u0000 f\u0000 (\u0000 Q\u0000 ,\u0000 \u0000 L\u0000 M\u0000 \u0000 )\u0000 \u0000 $ f(Q, mathcal {L}_{mathrm{M}})$\u0000 Gravity: Misner–Sharp Thermodynamic Analysis","authors":"J. K. Singh,&nbsp;Sonal Aggarwal,&nbsp; Sangeeta,&nbsp;P. K. Sahoo,&nbsp;D. D. Pawar","doi":"10.1002/andp.70297","DOIUrl":"https://doi.org/10.1002/andp.70297","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;We investigate the cosmological implications of a non-minimally coupled &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$f(Q, mathcal {L}_mathrm{M})$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; gravity model within the symmetric teleparallel framework, in which the non-metricity scalar &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;annotation&gt;$ Q$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; is coupled to the matter Lagrangian &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$ mathcal {L}_mathrm{M}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, where both curvature and torsion vanish identically. This framework is a specific form of the gravitational action that includes a coupling term &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$ f_2(Q) mathcal {L}_mathrm{M}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, thereby extending &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$f(Q)$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-gravity. We consider a power-law parameterization of the coupling functions and evaluate the Hubble parameter &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;H&lt;/mi&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;z&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$ H(z)$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. We use observational hubble data (OHD), the Union3 supernova compilation, dark energy spectroscopic instrument data release 2 (DESI DR2) baryon acoustic oscillation (BAO) data, and their joint datasets to constrain the model parameters with the Markov Chain Monte Carlo (MCMC) technique. The obtained model transitions from a decelerating state to an accelerating state and exhibits the quintessence model in late times. Furthermore, we discuss the various physical features of the model to show the model's physic","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emerging Type III Multiferroics","authors":"Yang Li","doi":"10.1002/andp.70298","DOIUrl":"https://doi.org/10.1002/andp.70298","url":null,"abstract":"<p>Type III multiferroics have recently been proposed as an emerging class of materials in which ferroelectricity and magnetism are linked through mechanisms that fall outside the conventional Type I/Type II classification. This perspective examines three representative theoretical routes. The first is symmetry locking in bilayer MnPSe₃, where sliding-ferroelectric switching reverses the altermagnetic spin polarization through a crystal-symmetry operation, without reversing the underlying Néel order. The second is ferroelectricity-driven Stoner magnetism in Cu-adsorbed monolayer InI₃, where an out-of-plane polar displacement narrows the bands near the Fermi level and drives a nonmagnetic-to-ferromagnetic transition. The third is the competing-electron-population mechanism proposed for monolayer TiCdO₄, in which an electron-deficient oxygen network produces both d° ferroelectricity and d⁰ magnetism from a common electronic origin. These mechanisms establish three conceptually distinct forms of coupling: symmetry-enforced reversal of spin polarization, polar-distortion-driven emergence of magnetism, and noncausal but strongly entangled electric and magnetic orders. Together, they broaden the design space of magnetoelectric materials beyond the conventional Type I/Type II dichotomy. The field nevertheless remains predominantly theoretical. Key challenges include establishing a consistent definition of Type III multiferroicity, expanding the candidate-material landscape, experimentally validating the predicted coupling, and translating the proposed mechanisms into device-relevant functionality.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly Squeezed Mechanical State Generation in an Optomechanical System Assisted by Nitrogen-Vacancy Ensembles","authors":"Yang-Yang Wang,&nbsp;Qian Liu","doi":"10.1002/andp.70295","DOIUrl":"https://doi.org/10.1002/andp.70295","url":null,"abstract":"<div>\u0000 \u0000 <p>Narrow linewidth and macroscopically accessible mechanical microstructures make mechanical squeezing a promising platform for ultra-high-sensitivity detection and fundamental investigations of classical-to-quantum quantum effects. The conventional approaches to utilizing optomechanical interactions for generating mechanical squeezing are restricted to the resolved-sideband regime, limiting their practical applicability. In this paper, we propose a scheme to generate a highly squeezed mechanical state in both resolved- and unresolved-sideband optomechanical systems assisted by nitrogen-vacancy ensembles (NVEs). By coupling two NVEs to the optical cavity, the detrimental counter-rotating terms that degrade mechanical squeezing are efficiently suppressed via destructive quantum interference originating from the NVEs-cavity coupling channels. Numerical results reveal that mechanical squeezing exhibits non-monotonic behavior with respect to both the optomechanical coupling ratio and the cavity-spin coupling strength. Moreover, the achievable degree of mechanical squeezing degrades as the initial thermal-phonon occupation of the mechanical resonator and the dissipation rates of the NVEs increase. This work offers an alternative feasible pathway toward strong mechanical squeezing beyond the 3-dB limit and broadens the application scope of hybrid solid-state-optomechanical quantum systems.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}