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Quantum Transport in a Graphene-Nanoribbon-Based Device with Rashba Spin- Orbit Coupling 基于Rashba自旋-轨道耦合的石墨烯-纳米带器件中的量子输运
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-10 DOI: 10.1007/s10773-026-06326-0
Xiao-Dong Tan, Jian Lei, Yu Shi, Li-Jun Li
{"title":"Quantum Transport in a Graphene-Nanoribbon-Based Device with Rashba Spin- Orbit Coupling","authors":"Xiao-Dong Tan,&nbsp;Jian Lei,&nbsp;Yu Shi,&nbsp;Li-Jun Li","doi":"10.1007/s10773-026-06326-0","DOIUrl":"10.1007/s10773-026-06326-0","url":null,"abstract":"<div><p>Based on the mean-field Hubbard model and the Green’s function formalism, we study the transport properties in a graphene-nanoribbon-based device with Rashba spin–orbit coupling (RSOC). Several influences on the conductance are discussed in detail, including ribbon width, ribbon length, RSOC, top-gate-generated potential energy <i>V</i>, on-site Coulomb repulsion <i>U</i>, Fermi energy <i>E</i><sub><i>F</i></sub>, and temperature <i>T</i>. The results show that the transport properties of this device are strongly related to its magnetic configurations that are primarily determined by <i>U</i>, and partly dependent on <i>V</i> and <i>E</i><sub><i>F</i></sub>. The RSOC and <i>T</i> have no significant effect on the total conductance. Interestingly, the total conductance exhibits a fluctuating behavior with increasing ribbon length and <i>V</i> at <i>U</i> = 1.2<i>t</i>. This behavior of conductance could be well modulated by top and back gates, thus making it available for field-effect transistors.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147643164","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}
引用次数: 0
Channel Estimation and Carrier Detection for Multiuser Multicarrier Continuous-Variable Quantum Key Distribution 多用户多载波连续变量量子密钥分配的信道估计与载波检测
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-09 DOI: 10.1007/s10773-026-06321-5
Laszlo Gyongyosi, Sandor Imre
{"title":"Channel Estimation and Carrier Detection for Multiuser Multicarrier Continuous-Variable Quantum Key Distribution","authors":"Laszlo Gyongyosi,&nbsp;Sandor Imre","doi":"10.1007/s10773-026-06321-5","DOIUrl":"10.1007/s10773-026-06321-5","url":null,"abstract":"<div><p>A multicarrier continuous-variable quantum key distribution (CVQKD) protocol uses subcarrier quantum states and subchannels for the transmission. Here, a subchannel estimation and subcarrier detection method is defined for multiuser multicarrier continuous-variable quantum key distribution. The subcarrier spreading technique estimates the transmittance conditions of the subchannels with a theoretical error-minimum in the presence of a Gaussian noise. We study the performance of the method and address the implementation framework.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-026-06321-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642572","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}
引用次数: 0
Analytical Investigation of Stability and Chaos in Magnetohydrodynamic Jeffery-Hamel Nanofluid Flows 磁流体动力学杰弗里-哈默尔纳米流体流动的稳定性和混沌分析研究
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-09 DOI: 10.1007/s10773-026-06322-4
Nageen Fatima, Giuliano De Stefano
{"title":"Analytical Investigation of Stability and Chaos in Magnetohydrodynamic Jeffery-Hamel Nanofluid Flows","authors":"Nageen Fatima,&nbsp;Giuliano De Stefano","doi":"10.1007/s10773-026-06322-4","DOIUrl":"10.1007/s10773-026-06322-4","url":null,"abstract":"<div><p>This study presents an analytical investigation of the nonlinear dynamics of magnetohydrodynamic (MHD) Jeffery–Hamel nanofluid flow in converging–diverging channels, with emphasis on stability transitions and chaotic behavior. Kerosene-based nanofluids containing Al<span>(_2)</span>O<span>(_3)</span>, CuO, and Fe<span>(_3)</span>O<span>(_4)</span> nanoparticles are examined under a transverse magnetic field. The Navier–Stokes equations are reduced to a nonlinear ordinary differential system using similarity transformations, and closed-form solutions are obtained via the Extended Hyperbolic Function method. A Hamiltonian formulation is derived to characterize the energy structure of the system, while a range of chaos diagnostics is employed to identify transitions between steady, quasi-periodic, and chaotic flow regimes. The results show that magnetic field strength significantly enhances flow stability by introducing Lorentz-force damping, which suppresses velocity fluctuations and delays the onset of chaos. Channel geometry also plays a key role: stronger convergence accelerates the flow and promotes instability, whereas larger divergence reduces peak velocity and supports stable behavior. Among the considered nanofluids, Fe<span>(_3)</span>O<span>(_4)</span> exhibits the strongest stabilizing effect due to its enhanced magnetic interaction. These findings demonstrate that magnetic field intensity, nanoparticle type, and channel angle can serve as effective control parameters for regulating nonlinear flow behavior in MHD nanofluid systems, which is important for the reliable design of microfluidic and thermal management devices.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642510","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}
引用次数: 0
Semi-Analytical Construction of Soliton Solutions for the Generalized Third-Order NLSE and the (2+1)-Dimensional BKK System 广义三阶NLSE和（2+1）维BKK系统孤子解的半解析构造
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-07 DOI: 10.1007/s10773-026-06323-3
Sandeep Malik, Zehra Pinar Izgi, Sachin Kumar, Hadi Rezazadeh, Ulviye Demirbilek
{"title":"Semi-Analytical Construction of Soliton Solutions for the Generalized Third-Order NLSE and the (2+1)-Dimensional BKK System","authors":"Sandeep Malik,&nbsp;Zehra Pinar Izgi,&nbsp;Sachin Kumar,&nbsp;Hadi Rezazadeh,&nbsp;Ulviye Demirbilek","doi":"10.1007/s10773-026-06323-3","DOIUrl":"10.1007/s10773-026-06323-3","url":null,"abstract":"<div><p>In this work, a broad class of new exact solutions is obtained for the generalized third-order nonlinear Schrödinger equation (NLSE) and the (2+1)-dimensional Broer–Kaup–Kupershmidt (BKK) system by employing a recently developed semi-analytical approach. Various types of soliton structures are derived, including dark, bright, and singular solitons for the generalized third-order NLSE, as well as kink, antikink, and singular solutions for the BKK system. To gain a further understanding of dynamical properties and attributes of the solutions obtained, detailed graphical illustrations are offered. The results extend the known families of exact solutions of these fundamental nonlinear models and help in the further improvement of ansatz-based approaches within the theory of nonlinear wave processes.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642843","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}
引用次数: 0
Geodesic Structure in Horizonless and Charged Spacetimes: A Comparative Study of Timelike and Null Orbits in Bertrand and Reissner- Nordström Geometries 无水平和带电时空中的测地线结构：Bertrand和Reissner- Nordström几何中类时轨道和零轨道的比较研究
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-07 DOI: 10.1007/s10773-026-06319-z
Jeevitha T U, Pranav Raibagkar, Sanjit Das
{"title":"Geodesic Structure in Horizonless and Charged Spacetimes: A Comparative Study of Timelike and Null Orbits in Bertrand and Reissner- Nordström Geometries","authors":"Jeevitha T U,&nbsp;Pranav Raibagkar,&nbsp;Sanjit Das","doi":"10.1007/s10773-026-06319-z","DOIUrl":"10.1007/s10773-026-06319-z","url":null,"abstract":"<div><p>The investigation of geodesics is pivotal for elucidating the geometric structure of spacetime. This article delves into the properties of timelike and null geodesics within horizonless and charged spacetimes, concentrating on Bertrand and Reissner-Nordström solutions. We investigate the effective potential and the differential equations governing circular timelike and null geodesics, providing critical insights into the trajectories of free-falling particles in these contexts. By focusing on three-dimensional spacetime, we derive the solutions to the geodesic equations restricted to the equatorial plane. For the case of the Bertrand spacetime-I (BST-I), we impose the specific condition <span>(varvec{D = 0})</span> and adopt the upper sign for our analysis.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642846","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}
引用次数: 0
An Extended Protocol for Secure Bidirectional Quantum Teleportation and Remote State Preparation in Multi-Qubit Systems 多量子位系统中安全双向量子隐形传态和远程状态准备的扩展协议
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-06 DOI: 10.1007/s10773-026-06290-9
Mohammad Hossein Valeh, Hossein Aghababa, Mohammadreza Kolahdouz, Masoud Barati
{"title":"An Extended Protocol for Secure Bidirectional Quantum Teleportation and Remote State Preparation in Multi-Qubit Systems","authors":"Mohammad Hossein Valeh,&nbsp;Hossein Aghababa,&nbsp;Mohammadreza Kolahdouz,&nbsp;Masoud Barati","doi":"10.1007/s10773-026-06290-9","DOIUrl":"10.1007/s10773-026-06290-9","url":null,"abstract":"<div><p>This paper proposes a hybrid quantum protocol in which Alice and Bob simultaneously transmit an n-qubit quantum state using a (4n + 1) qubit as a shared quantum channel. This scheme integrates quantum teleportation and remote state preparation (RSP) within a single unified framework, allowing multiple qubits to be transmitted concurrently. The protocol is supervised by a controller named Charlie, which provides an additional security layer during transmission. We demonstrate that the proposed protocol can be generalized to n-qubit, making it suitable for multi-party quantum communication protocols.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642691","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}
引用次数: 0
Typicality of the Projected Entangled Pair States Sampled by Random Gaussians 随机高斯抽样的投影纠缠对态的典型性
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-06 DOI: 10.1007/s10773-026-06316-2
Jing Bai, Jianquan Wang, Zhi Yin
{"title":"Typicality of the Projected Entangled Pair States Sampled by Random Gaussians","authors":"Jing Bai,&nbsp;Jianquan Wang,&nbsp;Zhi Yin","doi":"10.1007/s10773-026-06316-2","DOIUrl":"10.1007/s10773-026-06316-2","url":null,"abstract":"<div><p>Canonical typicality is a fundamental notion in quantum statistical physics, which demonstrates that in a bipartite system, the reduced state of the small subsystem is overwhelmingly close to the maximally mixed state. In this work, we study canonical typicality of random tensor networks on the two-dimensional spin lattice. Namely, we introduce a natural Gaussian sampling scheme for translation-invariant random projected entangled pair states (PEPS), motivated by recent work of Lancien and Pérez-García. Using tools from random matrix theory together with concentration-of-measure phenomena for Gaussian ensembles, we show canonical typicality for these random PEPS. Our results extend the seminal work of Collins, González-Guillén, and Pérez-García on random matrix product states (MPS) to the setting of two-dimensional lattice models and provide a mathematical foundation for understanding thermalization-like behavior in higher-dimensional tensor network states.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642692","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}
引用次数: 0
Scattering in Self-Generated Thermal Electron Sea around PEMFC Electrodes Under Non-Monochromatic Polarized Laser Fields 非单色偏振激光场下PEMFC电极周围自生热电子海的散射
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-02 DOI: 10.1007/s10773-025-06112-4
Saddam Husain Dhobi, Suresh Prasad Gupta, Kishori Yadav, Jeevan Jyoti Nakarmi, Ajay Kumar Jha
{"title":"Scattering in Self-Generated Thermal Electron Sea around PEMFC Electrodes Under Non-Monochromatic Polarized Laser Fields","authors":"Saddam Husain Dhobi,&nbsp;Suresh Prasad Gupta,&nbsp;Kishori Yadav,&nbsp;Jeevan Jyoti Nakarmi,&nbsp;Ajay Kumar Jha","doi":"10.1007/s10773-025-06112-4","DOIUrl":"10.1007/s10773-025-06112-4","url":null,"abstract":"<div><p>The objective of this study is to analyze the Differential Cross Section (DCS) in a self-generated thermal environment (exothermic reaction) and laser field (generate due to deceleration/ retardation of electron in field of charged particle) around the electrode of a Proton Exchange Membrane Fuel Cell (PEMFC). To study this, a theoretical model was developed using the thermal Volkov wave function and the dressed ground-state wave function of hydrogen atoms within a self-generated non-monochromatic polarized laser field, incorporating the Byron and Joachain approximation for non-relativistic thermal potentials. The model evaluates DCS under varying polarization states (elliptical, circular and linear) and observation shows that elliptical polarization consistently produces the highest DCS during absorption, while linear polarization dominates in specific emission scenarios. Peaks in DCS result from constructive interference, whereas dip peaks are caused by destructive interference in non-monochromatic fields across various parameters. The study underscores the significant roles of molecular/atom oscillations, scattering angles, momentum changes, temperature, and phase relationships in influencing scattering. These findings have applications in optimizing laser-assisted processes, advancing spectroscopic techniques, improving quantum collision studies, quantum computing and measurement of temperature due to charged particle field interaction. Additionally, offer insights into enhancing PEMFC efficiency through thermal management and a deeper understanding of scattering mechanisms in complex thermal environments.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606534","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}
引用次数: 0
Analytic Wigner Negativity for Mixtures and Superpositions of the Lowest Fock States 最低群居态混合和叠加的解析Wigner负性
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-04-01 DOI: 10.1007/s10773-025-06241-w
K. M. Fonseca Romero
{"title":"Analytic Wigner Negativity for Mixtures and Superpositions of the Lowest Fock States","authors":"K. M. Fonseca Romero","doi":"10.1007/s10773-025-06241-w","DOIUrl":"10.1007/s10773-025-06241-w","url":null,"abstract":"<div><p>The integrated negativity of the Wigner function, a computable and experimentally measurable indicator of nonclassicality linked to quantum speedup, non-Gaussianity, contextuality, and tunneling, has rarely been obtained in analytical form. Here we derive an analytical expression for the Wigner function negativity of single-mode states with at most one excitation, as well as for those obtained from them through linear symplectic transformations. Within this two-dimensional manifold, the states can be represented as points inside or on the surface of a Bloch sphere, and we show that those with a positive Wigner function form an ellipsoid inscribed within it. Furthermore, we establish a strong correlation between Wigner negativity and the trace-distance negativity, an alternative quantifier that is easier to access experimentally.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606601","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}
引用次数: 0
A Class of Analytical Solutions to the Vacuum Free Boundary Problem of a Viscous Two-Phase Model with Spherical Symmetry 一类具有球对称的粘性两相模型的无真空边界问题的解析解
IF 1.7 4区 物理与天体物理
International Journal of Theoretical Physics Pub Date : 2026-03-31 DOI: 10.1007/s10773-026-06324-2
Hongjing Jiang, Jianwei Dong
{"title":"A Class of Analytical Solutions to the Vacuum Free Boundary Problem of a Viscous Two-Phase Model with Spherical Symmetry","authors":"Hongjing Jiang,&nbsp;Jianwei Dong","doi":"10.1007/s10773-026-06324-2","DOIUrl":"10.1007/s10773-026-06324-2","url":null,"abstract":"<div><p>In this paper, we consider the vacuum free boundary problem of a viscous two-phase model with spherical symmetry, which consists of two mass equations and a momentum equation with viscosity coefficients of the form <span>(mu (n,rho )=(n+rho )^{theta })</span> and <span>(lambda (n,rho )=(theta -1)(n+rho )^{theta })</span>. We take the pressure function as <span>(P(n,rho )=n^{alpha }+rho ^{gamma })</span> (<span>(alpha ge 1)</span>, <span>(gamma &gt;1)</span>), where <i>n</i> and <span>(rho )</span> are the densities of two phases. We provide a class of global analytical solutions to this problem when <span>(alpha =gamma =theta =2)</span>. Moreover, we prove that the free boundary spreads out at least sub-linearly in time with the rate of <span>(mathcal {O}((1+t)^{1/3}))</span> and not more than linearly in time for the constructed solutions, by using the averaged quantities method.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147607244","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}
引用次数: 0
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