物理与天体物理最新文献

{"title":"Explicit Bargmann-type isomorphism between Berezin and Smolyanov representations of bosonic Fock spaces","authors":"N. N. Shamarov,&nbsp;M. V. Shamolin","doi":"10.1134/S0040577925040105","DOIUrl":"10.1134/S0040577925040105","url":null,"abstract":"<p> We construct a Bargmann-type isomorphism defined by the one-particle part <span>(H)</span> of the Fock space <span>(Gamma(H))</span> for an infinite-dimensional space <span>(H)</span> with involution. The formulas obtained also make sense in the case <span>(dim H&lt;infty)</span> and are closely related to the Segal–Bargmann space. Central to the construction is the notion of a shift-invariant distribution in the case of an infinite-dimensional domain of test functions. </p>","PeriodicalId":797,"journal":{"name":"Theoretical and Mathematical Physics","volume":"223 1","pages":"665 - 670"},"PeriodicalIF":1.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875423","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":"Scalable Open‐Air Synthesis of Mg2+‐Doped Lead‐Free Cs3Cu2Cl5 Nanocrystals for High‐Performance Green LEDs","authors":"Yang Tang, Qingyu Xie, Xuanming Zhang, Jiwei Ma, Hao Xie, Yongfeng Liu, Liang Zhao, Dongdong Yan, Xiaoyu Wang, Weixiang Ye","doi":"10.1002/lpor.202500430","DOIUrl":"https://doi.org/10.1002/lpor.202500430","url":null,"abstract":"Cs<jats:sub>3</jats:sub>Cu<jats:sub>2</jats:sub>Cl<jats:sub>5</jats:sub> nanocrystals (NCs) have emerged as promising optoelectronic materials owing to their efficient self‐trapped exciton (STE) emission. However, their limited environmental stability has significantly constrained their application in light‐emitting diodes (LEDs). In this work, a facile ambient‐air synthesis strategy is developed for Mg<jats:sup>2</jats:sup>⁺‐doped Cs<jats:sub>3</jats:sub>Cu<jats:sub>2</jats:sub>Cl<jats:sub>5</jats:sub> NCs that simultaneously addresses both stability and emission efficiency challenges. Remarkably, optimal Mg<jats:sup>2</jats:sup>⁺ doping (20%) enhances the photoluminescence quantum yield (PLQY) from 28.69% to 59.3%. Comprehensive theoretical investigations through density of states (DOS) calculations and ab initio molecular dynamics (AIMD) simulations demonstrate that Mg<jats:sup>2</jats:sup>⁺ doping induces bandgap narrowing for enhanced radiative recombination while reinforcing the crystal lattice stability. When integrated with a UV LED chip, the optimized NCs enable the fabrication of high‐performance green LEDs exhibiting outstanding luminance (17 281 cd m<jats:sup>−</jats:sup><jats:sup>2</jats:sup>) and excellent color stability (CIE coordinates: 0.354, 0.518). This study provides not only a practical synthetic approach for stable copper halide NCs but also valuable insights for designing efficient STE emitters for optoelectronic applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"5 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Dielectric permittivity extraction of MoS2 nanoribbons using THz nanoscopy","authors":"Henrik B. Lassen, William V. Carstensen, Denys I. Miakota, Ganesh Ghimire, Stela Canulescu, Peter U. Jepsen, Edmund J. R. Kelleher","doi":"10.1515/nanoph-2025-0060","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0060","url":null,"abstract":"The nanoscale optical properties of high-quality MoS<jats:sub>2</jats:sub> nanoribbons are investigated using THz nanoscopy based on a scattering-type scanning probe. The nanoribbons comprise a multilayer core, surrounded by monolayer edges. A featureless complex permittivity spectrum covering the range 0.6–1.6 THz is extracted from experimental time-domain measurements through a minimization procedure, adopting an extended finite-dipole model of the probe–sample interaction. Real-space mapping of the nanoribbon reveals variations in the local permittivity down to the instrument-limited resolution, on the order of 30 nm. Clustering analysis statistically identifies regions of lower apparent permittivity that we attribute to a high curvature at the edges of the nanoribbon causing an increase in local material strain or cross-talk in the measured signal with topography-induced measurement artifacts. The core of the nanoribbon contains two regions that follow tightly distributed, but slightly shifted Gaussian statistics in complex permittivity space, with the real part mean of both distributions lying around 5.4 and compatible with literature values of the static permittivity of thin-film MoS<jats:sub>2</jats:sub> reported previously. Our results show that the nanoribbons exhibit a modest degree of dielectric variation at the nanoscale that could be explained by heterogeneous doping or variations in the local defect density. We believe that our approach could be useful for the direct real-space measurement of dielectric disorder in other low-dimensional semiconducting material systems.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"42 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Quadrupolar and Dipolar Excitons in Bilayer 2H−MoSe2","authors":"Shun Feng, Aidan J. Campbell, Bibi Mary Francis, Hyeonjun Baek, Takashi Taniguchi, Kenji Watanabe, Iann C. Gerber, Brian D. Gerardot, Mauro Brotons-Gisbert","doi":"10.1103/physrevlett.134.166901","DOIUrl":"https://doi.org/10.1103/physrevlett.134.166901","url":null,"abstract":"We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of 2</a:mn>H</a:mi></a:mrow></a:math>-stacked bilayer <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mrow><c:msub><c:mrow><c:mi>MoSe</c:mi></c:mrow><c:mrow><c:mn>2</c:mn></c:mrow></c:msub></c:mrow></c:math>. The application of a vertical electric field results in a quadratic energy redshift of these quadrupolar excitons, in contrast to the linear energy splitting observed in the coexisting dipolar excitons within the bilayer <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mrow><e:msub><e:mrow><e:mi>MoSe</e:mi></e:mrow><e:mrow><e:mn>2</e:mn></e:mrow></e:msub></e:mrow></e:math>. We perform helicity-resolved reflectance contrast measurements to investigate the spin and valley configurations of the quadrupolar exciton states as a function of applied vertical electric and magnetic fields. Comparing our results with a phenomenological coupled-oscillator model indicates that the electric- and magnetic-field dependence of the quadrupolar exciton states can be attributed to the intra- and intervalley hybridization of spin-triplet interlayer excitons with opposite permanent dipole moments, mediated by interlayer hole tunneling. These results position naturally stacked <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mrow><g:msub><g:mrow><g:mi>MoSe</g:mi></g:mrow><g:mrow><g:mn>2</g:mn></g:mrow></g:msub></g:mrow></g:math> bilayers as a promising platform to explore electric-field-tunable many-body exciton phenomena. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"30 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Physical Interpretations and Geometric Structures of Soliton Behavior in Spacelike Curves Using Anholonomic Coordinates","authors":"Melek Erdoğdu,&nbsp;Ayşe Yavuz","doi":"10.1007/s10773-025-05987-7","DOIUrl":"10.1007/s10773-025-05987-7","url":null,"abstract":"<div><p>The study focuses on surface motion in three-dimensional Minkowski space, using anholonomic coordinates to analyze unit-speed spacelike curves with timelike normality. It highlights the importance of anholonomic coordinates in investigating important ideas and conclusions based on differential geometry. The study also aims to osculate motion in spacelike curve flows, consider surfaces through the integration of tangent and normal directions using anholonomic coordinates, and investigate their interaction with soliton equations. Building on this foundation, it studies the use of binormal and tangent directions, as well as anholonomic coordinates, to recognize motions across surfaces, as well as their connection with solitonic equations. In addition, this study examines at normal motion for spacelike curve functions, using anholonomic coordinates to control motion in normal and binormal directions and analyzing the resulting soliton equations. This work emphasizes the detailed connection between surface motion and anholonomic coordinates, which is fundamental for understanding the many behaviors presented by spacelike curves in Minkowski space and their importance in soliton equations. This paper demonstrates the complex connection between surface motion and anholonomic coordinates, which is important for understanding the many behaviors displayed by spacelike curves in Minkowski space and their significance in soliton equations.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871388","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":"On the Superconducting Critical Temperature of La(_{2-x})Sr(_{x})CuO(_{4})/Sm(_{2})CuO(_4) Superlattice: Polaronic Point of View of Stacking Periodicity Dependence","authors":"B. Ya. Yavidov,&nbsp;S. M. Otajonov,&nbsp;D. E. Uskenbaev,&nbsp;O. K. Ganiev,&nbsp;A. S. Jalekeshov,&nbsp;T. Saparbaev","doi":"10.1007/s10948-025-06978-9","DOIUrl":"10.1007/s10948-025-06978-9","url":null,"abstract":"<div><p>This paper investigates the superconductivity of La<span>(_{2-x})</span>Sr<span>(_{x})</span>CuO<span>(_{4})</span>/Sm<span>(_{2})</span>CuO<span>(_4)</span> superlattices using a theoretical approach based on the extended Holstein model and bipolaronic mechanism for high-temperature superconductivity. We analyzed the dependence of the superconducting critical temperature (<span>(T_c)</span>) on the thickness of the La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> layer (<span>(d_f)</span>) within the superlattice, which can also be expressed as the number of La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> half-unit cells (<span>(N_{stc.p})</span>). Our model assumes that the charge carriers in superconducting La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> layers are bipolarons. We associate high-temperature superconductivity with the superfluidity of the liquid of intersite bipolarons and estimate the superfluidity transition temperature as the Bose-Einstein condensation temperature (<span>(T_{BEC})</span>) of the gas (liquid) of intersite bipolarons. In this way, we directly link the superlattice’s <span>(T_c)</span> with the corresponding Bose-Einstein condensation temperature (<span>(T_{BEC})</span>). Numerical calculations revealed a strong correlation between <span>(T_c)</span> and <span>(T_{BEC})</span>. Importantly, these calculations accurately reproduce the experimental trend of <span>(T_c)</span> with respect to <span>(d_f)</span> or <span>(N_{stc.p})</span>. Our results strongly suggest that strain-induced polaronic effects play a critical role in the superconductivity of La<span>(_{2-x})</span>Sr<span>(_{x})</span>CuO<span>(_{4})</span>/Sm<span>(_{2})</span>CuO<span>(_4)</span> superlattices, further supporting the validity of the bipolaronic model for high-temperature superconductivity in cuprates.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871298","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":"Viscous accretion and ejection from tori around black holes in general relativity","authors":"Masaru Shibata, Kyohei Kawaguchi, Alan Tsz-Lok Lam","doi":"10.1103/physrevd.111.083042","DOIUrl":"https://doi.org/10.1103/physrevd.111.083042","url":null,"abstract":"We systematically perform long-term (millions of Schwarzschild time) axisymmetric viscous hydrodynamics simulations for tori around black holes in general relativity supposing the super-Eddington accretion flow. The initial condition for the tori is modeled simply by the Fishbone-Moncrief torus with a constant specific angular momentum j</a:mi></a:math> but with a wide variety of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>j</c:mi></c:math>. Such a torus may be a remnant after tidal disruption of ordinary stars near a relatively low-mass supermassive black hole or an outcome of an inflow of the matter with a low specific angular momentum. We find that, for a given density profile, the fraction of the mass infall onto the black hole is approximately proportional to <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msup><e:mi>j</e:mi><e:mrow><e:mo>−</e:mo><e:mn>1</e:mn></e:mrow></e:msup></e:math>, indicating that only a minor fraction of the matter in the torus formed far from the black hole falls into the black hole, while the majority is ejected with the typical average velocity of a few percent of the speed of light. We also find that the mass ejection is driven only outside <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mrow><g:mo>≈</g:mo><g:mn>2</g:mn><g:msub><g:mrow><g:mi>r</g:mi></g:mrow><g:mrow><g:mi>ISCO</g:mi></g:mrow></g:msub></g:mrow></g:math>, where <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:msub><i:mi>r</i:mi><i:mrow><i:mi>ISCO</i:mi></i:mrow></i:msub></i:math> is the areal radius of the innermost stable circular orbit around black holes, which depends strongly on the black hole spin. We derive an approximate fitting formula for the spin dependence on the mass infall fraction as <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:mrow><k:mo>∝</k:mo><k:msubsup><k:mrow><k:mi>r</k:mi></k:mrow><k:mrow><k:mi>ISCO</k:mi></k:mrow><k:mrow><k:mn>0.7</k:mn></k:mrow></k:msubsup></k:mrow></k:math>, which suggests that the rapid growth of supermassive black holes proceeded primarily by the accretion of the matter with the angular momentum counterrotating with the black hole spin. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"3 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Corrigendum to “Improving treatment quality of gynecologic cancers with online adaptive brachytherapy using deep learning-based CT imaging” [Nuclear Instrum. Method. Phys. Res. Sec. A: Accelerat. Spectrometer. Detector. Associat. Equipm. 1072 (2025) 170149]","authors":"Hyemi Kim,&nbsp;Minjae Lee,&nbsp;Hyun Joon Choi","doi":"10.1016/j.nima.2025.170531","DOIUrl":"10.1016/j.nima.2025.170531","url":null,"abstract":"","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1077 ","pages":"Article 170531"},"PeriodicalIF":1.5,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Feynman integral in QFT and white noise on a compactified version of space–time with a Lie group structure","authors":"J. Wawrzycki","doi":"10.1134/S0040577925040117","DOIUrl":"10.1134/S0040577925040117","url":null,"abstract":"<p> We present a rigorous construction of the Feynman integral on the compactified Einstein Universe using white noise calculus. Our construction of functional averaging can also be thought of as a solution to a problem posed by Bogoliubov and Shirkov. </p>","PeriodicalId":797,"journal":{"name":"Theoretical and Mathematical Physics","volume":"223 1","pages":"671 - 689"},"PeriodicalIF":1.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875421","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":"On the Rayleigh–Schrödinger coefficients for the eigenvalues of regular perturbations of an anharmonic oscillator","authors":"Kh. K. Ishkin","doi":"10.1134/S0040577925040099","DOIUrl":"10.1134/S0040577925040099","url":null,"abstract":"<p> We identify a class of perturbations of a complex anharmonic oscillator <span>(H)</span> for which the known formulas for the Rayleigh–Schrödinger coefficients can be significantly simplified. We investigate the effect of the spectral instability of the operator <span>(H)</span> on the behavior of the sequence of first perturbative corrections. We show that if <span>(H)</span> is not self-adjoint and the perturbation is finite and has finite smoothness at the right end of its support, then this sequence exponentially increases at infinity. </p>","PeriodicalId":797,"journal":{"name":"Theoretical and Mathematical Physics","volume":"223 1","pages":"650 - 664"},"PeriodicalIF":1.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875422","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}