Annalen der Physik最新文献

{"title":"Thermodynamic Multipoles and Dissipative Conductivities in Metallic Systems","authors":"Takumi Sato,&nbsp;Satoru Hayami","doi":"10.1002/andp.70251","DOIUrl":"https://doi.org/10.1002/andp.70251","url":null,"abstract":"<div>\u0000 \u0000 <p>Multipoles provide a systematic framework for describing the electronic structures of quantum materials from a symmetry perspective. Thermodynamic multipole moments in crystalline solids exhibit direct microscopic connections to certain allowed physical responses beyond symmetry; however, such relations have thus far been limited to dissipationless responses in equilibrium insulating systems. Here, this framework is extended at a heuristic level by focusing on the Fermi-surface contributions to thermodynamic multipole moments. These contributions establish direct relations to dissipative transport responses characteristic of metals, including charge and spin conductivities. A key consequence is that the conductivities exhibit extrema, typically maxima, at chemical potentials where the corresponding Fermi-surface contributions to the multipoles vanish, specifically, the electric quadrupole for charge conductivity and the magnetic octupole for spin conductivity. These findings uncover a previously overlooked aspect of thermodynamic multipole moments, opening a new perspective on dissipative transport in metallic systems.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148784856","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":"Gravitational Radiation From Binary Systems With Time Varying Masses","authors":"Teodora M. Matei,&nbsp;Cristian A. Croitoru,&nbsp;Tiberiu Harko","doi":"10.1002/andp.70276","DOIUrl":"https://doi.org/10.1002/andp.70276","url":null,"abstract":"<p>We consider the properties of the gravitational radiation emitted by massive stars in binary systems with time varying mass, orbiting around each other in Keplerian orbits under the influence of the gravitational force. When this effect is combined to the quadrupole expression of the gravitational radiation, some supplementary terms in the standard formulae describing radiative effects do appear. By using the generalized quadrupole formalism, with time dependent masses, we obtain the expressions describing the time variation of the angular momentum, semimajor axis, eccentricity and periastron shift of the binary system. As a simple application of the developed formalism we consider in detail two cases of the mass variation, by assuming a linear and an exponential time dependence, respectively. The gravitational radiation characteristics corresponding to these models are fully investigated numerically with the help of a dedicated software package GRAV-T\u0000, specifically developed for the study of the gravitational radiation of the mass varying systems. The impact of the gravitational wave emission on the merger of two magnetars losing mass due to neutrino heated winds is also investigated in detail.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70276","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148784924","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":"Photonic Mode Description of the Jaynes–Cummings Hamiltonian States","authors":"V. F. Maisi","doi":"10.1002/andp.70273","DOIUrl":"https://doi.org/10.1002/andp.70273","url":null,"abstract":"<p>Jaynes–Cummings Hamiltonian provides the elemental description of a two-level system interacting with a photonic mode. In this work, we review the Jaynes–Cummings formalism for an electronic two-level system. The purpose is to summarize and connect together the key theory concepts relevant for the transmission response probed typically in the experiments. The review provides a photonic mode description of the response with analytical results for several limiting cases. These expressions are useful for gaining understanding and intuition on what influences the measured response. We also connect the photonic response to several key concepts in the field: the dispersive shift in qubit readout, the quantum capacitance of semiconductor nanostructures and the effective dissipation rate of the two-level system.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70273","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783894","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":"Third Chern Topology in Hexeract Circuits","authors":"Zilin Wang,&nbsp;Weijian Huangyang,&nbsp;Xiumei Wang,&nbsp;Pei Ma,&nbsp;Xingping Zhou","doi":"10.1002/andp.70274","DOIUrl":"https://doi.org/10.1002/andp.70274","url":null,"abstract":"<div>\u0000 \u0000 <p>When the system dimension breaks through the three-dimensional (3D) physical space and enters the synthesis dimension of four-dimensional (4D), six-dimensional (6D), or even higher, the topological invariants become the mathematical law to describe the global nature in the extremely complex parameter maze. Here, we explore the third Chern topology in an explicitly constructed 6D electric circuit lattice. To reduce the prohibitive computational costs of high-dimensional tensor calculations inherent in conventional 6D topological evaluations, our design utilizes the steady-state admittance spectrum as a direct physical proxy. By modularizing hopping channels into scalable reactive couplings, we drastically reduce network complexity. This streamlined architecture enables the reproducible assembly of finite-size Hexeract lattices and direct observation of mass-driven phase transitions and robust corner states, establishing a highly efficient paradigm for high-dimensional topological physics.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783896","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":"Aharonov–Bohm Effect for Cooper Pairs in Kerr Spacetime: Gravitomagnetic Phase Shifts From Frame Dragging","authors":"Erdem Sucu,&nbsp;İzzet Sakallı","doi":"10.1002/andp.70256","DOIUrl":"https://doi.org/10.1002/andp.70256","url":null,"abstract":"&lt;p&gt;The unification of quantum mechanics and general relativity remains a central problem in fundamental physics. Here, we study the gravitomagnetic Aharonov–Bohm (AB) effect for Cooper pairs in Kerr spacetime. Frame-dragging by a rotating black hole (BH) generates an effective vector potential through the off-diagonal metric term &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;t&lt;/mi&gt;\u0000 &lt;mi&gt;ϕ&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$g_{tphi }$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, coupling to the macroscopic phase of the superconducting condensate. We derive the gauge-invariant phase shift &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mi&gt;θ&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;mi&gt;π&lt;/mi&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mo&gt;∗&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mi&gt;a&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;ℏ&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Delta theta = (4pi m^* Ma/hbar)(1/r_2 - 1/r_1)$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; for an interferometer with arms at radii &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$r_1$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$r_2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, where &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mo&gt;∗&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;msu","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.70256","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148784396","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":"Polarization-Insensitive VO2/Graphene/Diamond Heterostructure Metasurface With Dynamic Broadband/Narrowband Tunability","authors":"Boning Wen,&nbsp;Feng Wen,&nbsp;Shaowei Zhang,&nbsp;Muhua Zhai,&nbsp;Xin Yao,&nbsp;Chengyong Wang,&nbsp;Yang Lei,&nbsp;Zepei Li,&nbsp;Jiani Li,&nbsp;Zhihao Tong,&nbsp;Yanpeng Zhang,&nbsp;Hongxing Wang","doi":"10.1002/andp.70275","DOIUrl":"https://doi.org/10.1002/andp.70275","url":null,"abstract":"<div>\u0000 \u0000 <p>Multifunctional metasurfaces, a type of artificial two-dimensional material, enable simultaneous or switchable modulation of electromagnetic radiation's multiple degrees of freedom through elaborate subwavelength periodic/aperiodic structure design, with applications in communications, imaging, and sensing. However, existing ones face difficulties in precisely modulating narrowband/broadband modes, both limited by low Q-factors. Here, we present a polarization-insensitive multifunctional switchable metasurface enabled by a vanadium dioxide (VO₂)/graphene/diamond heterostructure. We demonstrate that flexible switching of the metasurface between narrowband and broadband modes can be achieved by precisely tuning the Fermi level of the upper graphene layer and the electrical conductivity of the lower VO₂. The Q-factors of two narrowband peaks reach 32.7 and 41.9, which are significantly higher than previously reported values. Furthermore, tailoring the gap between adjacent graphene disks can facilitate the achievement of BIC and quasi-BIC within the system. In addition, we also demonstrate that systematic optimization of key parameters, including geometric structure, chemical potential, and carrier relaxation time, enables the multifunctional metasurface to achieve robust impedance matching with free space, coupled with a large angular tolerance and remarkable polarization insensitivity. This multifunctional metasurface holds considerable potential for applications in spectral sensing, terahertz filtering, and electromagnetic interference (EMI) shielding devices.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783816","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":"Quantum Steering of Imaginarity in Schwarzschild Spacetime","authors":"Bing Yu,&nbsp;Xiao-Yong Yang,&nbsp;Xiaoli Hu,&nbsp;Zhi-Xiang Jin,&nbsp;Xiaofen Huang","doi":"10.1002/andp.70267","DOIUrl":"https://doi.org/10.1002/andp.70267","url":null,"abstract":"<div>\u0000 \u0000 <p>We study the distribution of quantum imaginarity in Schwarzschild spacetime under Hawking radiation via imaginarity steering functionals. For bipartite systems, we analyze Werner states and general two-qubit X-states and find that the steering functional of physically accessible states decreases monotonically with Hawking temperature, shrinking the steerable region, whereas physically inaccessible states remain unsteerable for all temperatures. For multipartite systems, we consider general three-qubit pure states up to local unitary equivalence and show that Hawking radiation induces a family of monogamy-like steering inequalities with temperature-independent bounds determined by subsystem accessibility. The corresponding maximal sum of imaginarity steering functionals decreases as the Hawking temperature increases when both subsystems are accessible, remains invariant when only one subsystem is inaccessible, and increases when both subsystems are inaccessible. These results reveal how Hawking radiation reshapes the distribution of imaginarity in relativistic spacetime.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753292","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":"Phase-Dependent Superconductivity in LnB2C2 (Ln = Y, Lu and La) and Prediction of Y2B3C2 as a Weakly Coupled Superconductor","authors":"Hosea Sichula,&nbsp;Sadık Baǧcı,&nbsp;Hüseyin Yasin Uzunok,&nbsp;H. M. Tütüncü","doi":"10.1002/andp.70272","DOIUrl":"https://doi.org/10.1002/andp.70272","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;This work reports first-principles studies of structural, electronic, elastic, mechanical, phononic and electron–phonon interaction properties for the simple tetragonal P4/mbm and P4&lt;sub&gt;2&lt;/sub&gt;/mmc structures of &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;LnB&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm LnB}_2{rm C}_2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (Ln = Y, Lu, and La) in comparison with a base-centered orthorhombic Cmmm structure of &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;Y&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;B&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Y}_2{rm B}_3{rm C}_2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. Extensive analysis establishes both the mechanical and dynamical stability of all studied compounds, evidenced by detailed calculations of elastic constants and phonon dispersion spectra. Calculated Vickers hardness values reach up to 18.77 GPa, identifying &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;LnB&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm LnB}_2{rm C}_2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; as a promising candidate for wear-resistant coatings and cutting tools. The study further evaluates the polycrystalline bulk modulus, shear modulus, Young's modulus and Poisson's ratio, demonstrating significant anisotropy in these systems. Electronic structure calculations show that all the studied compounds are electrically conductive, and the contribution to the electrical conductivity comes from Ln d electrons as well as p electrons of B and C atoms. Finally, electron–phonon interaction calculations reveal for the first time that &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;Y&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;B&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Y}_2{rm B}_3{rm C}_2$&lt;/annotation&gt;\u0000 ","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753319","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":"Ultralow-Energy Plasmon-Assisted Interfacial Charge Transfer at Au–SiH Interfaces","authors":"Junais Habeeb Mokkath","doi":"10.1002/andp.70270","DOIUrl":"https://doi.org/10.1002/andp.70270","url":null,"abstract":"<div>\u0000 \u0000 <p>Ultrafast and nonequilibrium charge transfer at metal–semiconductor interfaces is a central mechanism for emerging quantum optoelectronic and plasmonic technologies. Here, we investigate the quantum dynamics of plasmon-assisted charge transfer at a silicon-compatible Au–SiH interface using real-time time-dependent density functional theory combined with transition–contribution analysis and spatially resolved charge partitioning. We identify an ultralow-energy interfacial excitation at <span></span><math>\u0000 <semantics>\u0000 <mo>∼</mo>\u0000 <annotation>$sim$</annotation>\u0000 </semantics></math>0.2 eV as a highly collective plasmon-assisted hybrid interfacial charge-transfer mode with pronounced Au–SiH character. Time-resolved induced densities and fragment-resolved dipole dynamics reveal femtosecond <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Au</mi>\u0000 <mo>→</mo>\u0000 <mi>SiH</mi>\u0000 </mrow>\u0000 <annotation>${rm Au}rightarrow{rm SiH}$</annotation>\u0000 </semantics></math> charge displacement, with the fastest response occurring within <span></span><math>\u0000 <semantics>\u0000 <mo>∼</mo>\u0000 <annotation>$sim$</annotation>\u0000 </semantics></math>10–20 fs for the ideal <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>Au</mi>\u0000 <mn>147</mn>\u0000 </msub>\u0000 <annotation>${rm Au}_{147}$</annotation>\u0000 </semantics></math>/SiH model, demonstrating an intrinsically quantum-coherent interfacial response. Energy-resolved hot-carrier spectra show selective population of SiH conduction states within the 0–2 eV window, yielding ntrinsic electron transfer efficiencies approaching unity for the clean, idealized interface. These results establish ultralow-energy plasmon-assisted interfacial excitations as efficient quantum channels for directional charge transfer and highlight Au–SiH heterostructures as a promising platform for silicon-integrated quantum optoelectronic and hot-carrier devices.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753318","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":"Controlling Kerr Nonlinearity via Balanced Gain/Loss for Short Optical Pulse Propagation in a Non-Hermitian Directional Coupler Under Negligible Dispersion","authors":"Anisha Sharma,&nbsp;Suman Dey,&nbsp;Soumyadeep Chattaraj,&nbsp;Nikhil Ranjan Das","doi":"10.1002/andp.70269","DOIUrl":"https://doi.org/10.1002/andp.70269","url":null,"abstract":"<div>\u0000 \u0000 <p>The impact of the concurrent presence of Kerr nonlinearity and balanced gain/loss on picosecond pulse propagation in twin-core AlGaAs waveguides is investigated under negligible dispersion using the Split-Step Fourier Method. This dual influence establishes a mechanism for controlling the longitudinal length at which the excited pulse breaks, termed the breaking length. For a fixed input power, a reduction in the balanced gain/loss transforms a breaking pulse with a broad, noisy spectrum into a normal pulse with a narrow spectrum through intermediate states of simultaneous splitting in both cores and splitting confined to one core. Conversely, increasing the coupling coefficient at constant gain/loss and input power also drives this transition. Therefore, balanced gain/loss serves as a control parameter to regulate nonlinear effects at a fixed wavelength, providing the basis for a sensing strategy in non-resonant non-Hermitian coupler structures. Furthermore, increasing the wavelength at constant gain/loss and input power decreases the effective nonlinearity, and consistent sensing performance can be maintained by precise power adjustment across a range of central wavelengths. Overall, this non-Hermitian control of nonlinear pulse dynamics opens new opportunities for device design with gain–loss and coupling regulation in integrated photonic platforms.</p>\u0000 </div>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"538 8","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753589","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}