Chinese Journal of Physics最新文献

{"title":"Ultralow contact resistance ohmic contact via self-intercalated InSe heterostructure","authors":"Jiexin Wang ,&nbsp;Huan Wang ,&nbsp;Xiaojie Liu ,&nbsp;Yin Wang ,&nbsp;Haitao Yin","doi":"10.1016/j.cjph.2025.12.019","DOIUrl":"10.1016/j.cjph.2025.12.019","url":null,"abstract":"<div><div>Two-dimensional semiconductors are key candidate materials for overcoming the size limitations of silicon-based field-effect transistors; however, their high contact resistance at the interface has become the primary bottleneck restricting the performance of sub-2nm node devices. To address this challenge, we designed a self-intercalated bilayer InSe/monolayer InSe heterostructure and systematically investigated its interfacial and charge transport properties using a combined density functional theory (DFT) and non-equilibrium Green's function (NEGF) approach. Analysis of the interfacial electronic structure revealed that the effective potential in the bulk semiconductor region is higher than at the metal-semiconductor interface. The tunneling barrier between metal and semiconductor vanishes, which significantly enhances carrier injection capability. Moreover, the work function difference between metal and semiconductor induces band realignment at the interface, enabling ohmic contact along the device’s armchair (AC) and zigzag (ZZ) directions. The equilibrium conductance measurements yield remarkably low contact resistances of 40.74 Ω·μm and 52.32 Ω·μm for the ZZ and AC directions, respectively. These values compare favorably with the best-reported contacts in 2D materials and approach the fundamental quantum limit of approximately 30 Ω·μm for monolayer systems. The research outcomes substantiate that the self-intercalation-engineered device architecture provides a groundbreaking strategy for fabricating new-generation nanoelectronics featuring ultralow contact resistance and minimized power dissipation.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 356-365"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837439","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":"Observational signatures of the Schwarzschild-like black hole","authors":"Javokhir Sharipov ,&nbsp;Mirzabek Alloqulov ,&nbsp;Pankaj Sheoran ,&nbsp;Sanjar Shaymatov","doi":"10.1016/j.cjph.2025.12.024","DOIUrl":"10.1016/j.cjph.2025.12.024","url":null,"abstract":"<div><div>The nature of black holes (BHs) and their potential deviations from classical General Relativity (GR) remain fundamental questions in modern astrophysics. Nonlinear electrodynamics (NED) has been proposed as a viable mechanism to construct regular BHs that avoid singularities while preserving essential astrophysical properties. In this work, we perform a comprehensive analysis of NED-inspired BHs, deriving constraints on the magnetic parameter through both theoretical analysis and Bayesian parameter estimation using Event Horizon Telescope (EHT) observations of shadow sizes and GRAVITY collaboration measurements of stellar orbits for Sgr A*. Our Markov Chain Monte Carlo (MCMC) analysis yields magnetic charge estimates consistent with zero: <span><math><mrow><mi>q</mi><mo>=</mo><mo>−</mo><mn>0</mn><mo>.</mo><msubsup><mn>0009</mn><mrow><mo>−</mo><mn>0.4908</mn></mrow><mrow><mo>+</mo><mn>0.4915</mn></mrow></msubsup><mo>×</mo><msup><mn>10</mn><mn>9</mn></msup><msub><mi>M</mi><mo>⊙</mo></msub></mrow></math></span> for M87* and <span><math><mrow><mi>q</mi><mo>=</mo><mo>−</mo><mn>0</mn><mo>.</mo><msubsup><mn>0000</mn><mrow><mo>−</mo><mn>0.4553</mn></mrow><mrow><mo>+</mo><mn>0.4532</mn></mrow></msubsup><mo>×</mo><msup><mn>10</mn><mn>6</mn></msup><msub><mi>M</mi><mo>⊙</mo></msub></mrow></math></span> for Sgr A*, establishing important upper limits while showing no evidence for significant magnetic charge in either source. We perform a comparative analysis of observational signatures including BH shadows (using <span><math><mrow><msub><mi>R</mi><mtext>sh</mtext></msub><mo>=</mo><msub><mi>r</mi><mtext>ph</mtext></msub><mo>/</mo><msqrt><mrow><mi>f</mi><mo>(</mo><msub><mi>r</mi><mtext>ph</mtext></msub><mo>)</mo></mrow></msqrt></mrow></math></span>, where <em>R</em>_sh is the shadow radius observed at infinity and <em>r</em>_ph is the photon sphere radius), and gravitational lensing under uniform and non-uniform plasma conditions, demonstrating how deviations from standard GR solutions emerge due to nonlinear electrodynamics. Our findings demonstrate that while current EHT data do not require non-zero magnetic charge, NED-induced modifications could leave detectable imprints on strong-field astrophysical processes, providing new opportunities to test alternative theories of gravity. Future missions, including the Laser Interferometer Space Antenna (LISA) and next-generation X-ray observatories, will play a crucial role in refining constraints on these theoretical models, building upon our MCMC-constrained parameter space while complementing ongoing observations from the EHT and precision mass measurements from instruments like GRAVITY, providing a more comprehensive understanding of BH physics and potential deviations from GR.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 461-480"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921007","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":"The single and double Dirac delta potentials under the assumption of minimal length","authors":"Yassine Chargui ,&nbsp;Anis Dhahbi ,&nbsp;Salah Boulaaras ,&nbsp;Abdelmalek Boumali","doi":"10.1016/j.cjph.2025.12.014","DOIUrl":"10.1016/j.cjph.2025.12.014","url":null,"abstract":"<div><div>The so-called Generalized Uncertainty Principle (GUP) is an alternative to the Heisenberg uncertainty principle that incorporates the idea of a minimum measurable length scale, often referred to as the Minimal Length (ML). In this paper, we investigate the first-order correction introduced by the GUP to the non-relativistic quantum mechanics of the single and double Dirac Delta Potentials (DDPs) in one dimension. For the single DDP, we show that the direct Schrödinger solution and the Green’s function method yield identical results for both bound and scattering states, clarifying the reasons behind earlier conflicting findings. For the double DDP, we find that the leading GUP correction to bound-state energies and scattering probabilities is of the order of the ML. Considering only this correction, the effect of the GUP is reduced to a slight decrease in the strength of the double DDP.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 563-572"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921009","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":"Dynamical topological quantum phase transitions in a finite-size spin system","authors":"Shaoying Yin ,&nbsp;Hongchun Sun ,&nbsp;Jinliang Guo ,&nbsp;Lina Bai ,&nbsp;Qiang Zhang","doi":"10.1016/j.cjph.2025.11.020","DOIUrl":"10.1016/j.cjph.2025.11.020","url":null,"abstract":"<div><div>Based on a finite-size extended XY spin chain with topological characteristics, we investigate in detail the dynamical quantum phase transitions (DQPTs) induced by quench parameters, including the three-spin interaction, the external magnetic field, and the anisotropy parameters. Four constraint relations that the quench parameters must satisfy to ensure exact zeros of the Loschmidt echo are derived. When the values of prequench and post-quench parameters lie within regions corresponding to different topological quantum phases, the critical time associated with the nonanalytic behavior of DQPTs exhibits a single time scale, and this property remains independent of the magnitude of the change in winding numbers that characterize the topological quantum phases. However, when the quench parameter is suddenly changed within the same topological quantum phase and crosses three or four topological phase transition points, DQPTs are observed to occur, and even the number of critical time scales increases with the system size. In particular, for large spin chains, the rate function of the Loschmidt echo exhibits periodic oscillations as a function of time.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 331-340"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837353","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":"Quantum entanglement in a two-cavity QED system mediated by a waveguide","authors":"J Alejandro Andrade","doi":"10.1016/j.cjph.2025.11.023","DOIUrl":"10.1016/j.cjph.2025.11.023","url":null,"abstract":"<div><div>This paper presents a comprehensive analysis of a two-cavity quantum electrodynamics system, in which each cavity hosts two quantum dots coupled via a waveguide. By deriving the eigenvectors and eigenvalues of the Hamiltonian, we identified a range of highly entangled states involving four excitons in the quantum dots and photons shared between the cavities. The temporal evolution of the Schrödinger equation was then employed to examine the phases of these entangled states and the specific times at which they emerge, while the degree of entanglement was quantified using the von Neumann entropy. Furthermore, we incorporated decoherence effects by solving the Lindblad master equation, enabling the determination of the effective time window for manipulating the entangled states before decoherence degrades their dynamics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 112-121"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749394","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":"Counterfactual bidirectional quantum operation teleportation protocol","authors":"Rui-Chen Huang ,&nbsp;Yu-Guang Yang ,&nbsp;Guang-Bao Xu ,&nbsp;Dong-Huan Jiang","doi":"10.1016/j.cjph.2025.12.027","DOIUrl":"10.1016/j.cjph.2025.12.027","url":null,"abstract":"<div><div>Traditional quantum operation teleportation protocols require the transmission of photons through quantum channels, which are subject to certain vulnerabilities. This paper proposes a counterfactual bidirectional quantum operation teleportation protocol, which enables the counterfactual remote transmission of quantum operations in both directions without the need for actual quantum state transmission or pre-shared entanglement. Compared to existing quantum operation teleportation protocols, this protocol offers enhanced security, providing a novel technical pathway for the widespread application of quantum communication.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 535-548"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920906","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":"Thermal transport effects on electrokinetic flow and ion partitioning in soft nanochannel","authors":"Deepak Kumar ,&nbsp;Saurabh Kr Maurya","doi":"10.1016/j.cjph.2025.11.025","DOIUrl":"10.1016/j.cjph.2025.11.025","url":null,"abstract":"<div><div>This study examines thermal transport and electroosmotic flow of an ionized electrolyte solution in a soft slit nanochannel with polyelectrolyte-coated walls. The polyelectrolyte layer (PEL), modeled as a fixed charge layer, interacts with ions both inside and outside, creating a semi-permeable interface. A dielectric difference between the PEL and electrolyte induces ion partitioning effects. The coupled Poisson-Boltzmann and Navier-Stokes equations are solved, with closed-form expressions obtained under the Debye-Hückel approximation and numerical solutions derived via finite difference approach. The influence of key dimensionless parameters on potential, velocity, ion distribution, temperature profile, and Nusselt and Brinkman number is analyzed. Results highlight the role of electrokinetic effects, Joule heating, ionic selectivity, and viscous dissipation in governing nanoscale thermal transport phenomena.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 366-382"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837435","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":"Patient-specific deep learning reduced-order model of blood hemodynamic indices in thoracic aortic aneurysms via dynamic mode decomposition","authors":"Nadia Ghezaiel Hammouda ,&nbsp;Joy Djuansjah ,&nbsp;Ali B M Ali ,&nbsp;As’ad Alizadeh ,&nbsp;Muntadher Abed Hussein ,&nbsp;Narinderjit Singh Sawaran Singh ,&nbsp;Khalil Hajlaoui ,&nbsp;Walid Aich","doi":"10.1016/j.cjph.2025.11.031","DOIUrl":"10.1016/j.cjph.2025.11.031","url":null,"abstract":"<div><div>This study proposes a data-driven reduced order modeling (ROM) framework for accurately predicting unsteady wall shear stress (WSS) distributions in thoracic aortic aneurysms (TAA). High-fidelity computational fluid dynamics (CFD) simulations of pulsatile blood flow were used to generate a snapshot library of WSS fields. Dynamic mode decomposition (DMD) was employed to extract dominant spatiotemporal flow structures and reduce the system dimensionality. These DMD time coefficients were then used to train a deep learning architecture combining convolutional neural networks (CNNs), squeeze-and-excitation (SE) attention blocks, and long short-term memory (LSTM) units. The proposed attention-enhanced CNN-LSTM model accurately forecasts the temporal evolution of DMD coefficients, enabling full-field WSS reconstruction at unseen time instances. Quantitative evaluations demonstrate strong agreement with ground truth CFD results, with pointwise relative errors remaining below 5 % on most regions of the aneurysm surface. Modal and gradient-based analyses reveal that high WSS gradients and flow complexity near the dome and outlet regions contribute most to prediction errors. Overall, the method offers an efficient and accurate surrogate for simulating complex hemodynamics in patient-specific geometries, making it suitable for real-time clinical evaluation and treatment planning.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 139-161"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797819","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":"Research on the broadband radiation-enhanced piezoelectric antenna based on multimodal coupled vibration","authors":"Yong Zhang,&nbsp;Hongcheng Zhou,&nbsp;Zhongming Yan,&nbsp;Yu Wang","doi":"10.1016/j.cjph.2025.12.017","DOIUrl":"10.1016/j.cjph.2025.12.017","url":null,"abstract":"<div><div>Piezoelectric antennas break through the mutual constraint relationship between traditional antenna wavelength and size, featuring low-frequency miniaturization and high radiation efficiency. However, narrowband and low radiation intensity severely limit the communication distance and channel capacity in practical application scenarios. Therefore, a multi-modal coupled piezoelectric antenna with stacked structure is proposed to enhance the radiation intensity and achieve multi-frequency wideband characteristics. The cavity structure formed by stacking, along with the design of the energy-trapping electrodes can reduce the acoustic propagation losses, and the antenna is capable of high radiation efficiency and multi-frequency operation, while also realize the guiding effect on electromagnetic waves. By integrating the piezoelectric constitutive equations with the equivalent density parameter method, a theoretical model was developed to characterize the heterogeneous properties of electrode regions, revealing the regulatory mechanism by which mass–stiffness coupling influences energy-trapping effect, and the corresponding electromechanical model reveals the radiation enhancement mechanism of the laminated structure on the piezoelectric antenna. The experimental results indicate that the antenna has six operating frequencies, with an effective communication range of 60m. The antenna demonstrates a 3-4 orders higher magnetic field emitting efficiency compared to a conventional loop coil antenna in VLF/LF band. The near-field radiation pattern demonstrates significant directionality (front to back ratio of 12dB).Furthermore, a digital amplitude shift keying (ASK) modulation and frequency-shift keying (FSK) are conducted with a low frequency (LF) carrier signal to enable anti-interference communication. These results demonstrate the enormous potential of the proposed antenna in portable, intelligent, and high-performance wireless communication devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 426-437"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880790","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":"Chaotic dynamics and homogeneous coexisting behaviors in Josephson junction-based system","authors":"Ling Lu ,&nbsp;Haikong Lu ,&nbsp;Bocheng Bao","doi":"10.1016/j.cjph.2025.12.030","DOIUrl":"10.1016/j.cjph.2025.12.030","url":null,"abstract":"<div><div>To demonstrate the chaotic dynamics and homogeneous coexisting behaviors triggered by a Josephson junction (JJ), this study proposes a four-dimensional JJ-based system by coupling a JJ with a three-dimensional linear dynamical system. The equilibrium points with stability are discussed theoretically. By employing various numerical methods, the bifurcation behaviors that depend on the JJ parameters are investigated, and the homogeneous coexisting behaviors that depend on the initial-values are inspected. Theoretical analyses and numerical calculations manifest that the proposed system owns infinitely many isolated equilibrium points whose stability is associated with the JJ parameters and the JJ initial-value. The nonlinearity of JJ enables the proposed system to show chaotic dynamics, and the JJ initial-value offset can cause the proposed system to present homogeneous coexisting attractors. Finally, an analog circuit is developed to implement the JJ-based system, and the circuit simulations and hardware experiments confirm the numerical calculations.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 438-449"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880958","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}