Chinese Journal of Physics最新文献

{"title":"A front-fixing method for the nonlinear and coupled phase change model in a moving domain","authors":"Jaya Joshi,&nbsp;Rajeev","doi":"10.1016/j.cjph.2025.02.013","DOIUrl":"10.1016/j.cjph.2025.02.013","url":null,"abstract":"<div><div>This study presents a mathematical model for a sublimation problem in a two-phase region which involves temperature and concentration-dependent thermophysical properties to investigate the temperature distribution and mass density in both regions. The numerical solution to the problem is acquired by employing a front-fixing explicit finite difference method. The consistency and stability of the numerical scheme are theoretically analyzed. The accuracy of the presented method is validated through a comparison with the exact solution achieved in a particular case and it is identified that current results are sufficiently near to them. The consequences of different dimensionless parameters on temperature and sublimation curve are presented graphically. The findings from this study provide some ways to accelerate the speed of phase transition with minimal energy absorption of particles during the sublimation process.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 29-43"},"PeriodicalIF":4.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548088","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":"Advanced electrotunable linear polarization rotator with high degree of linear polarization using dye-doped 90°-twisted nematic liquid crystals","authors":"Yi-Xuan Liu ,&nbsp;Pravinraj Selvaraj ,&nbsp;Chi-Tang Huang,&nbsp;Yu-Hsiang Tseng,&nbsp;Wei-Hao Chen,&nbsp;Ching-Cherng Sun,&nbsp;Ko-Ting Cheng","doi":"10.1016/j.cjph.2025.02.020","DOIUrl":"10.1016/j.cjph.2025.02.020","url":null,"abstract":"<div><div>Considerable attention has been allotted to the generation and manipulation of polarization light due to its unique optical properties and potential applications. Nevertheless, existing polarization rotators are limited in their capability to provide continuous linear polarization rotation and maintain a high degree of linear polarization (DoLP) via electric stimuli, and this condition is severely inherent in their system design flexibility. In this study, we enhance the performance of a continuously electrotuneable linear polarization rotator by utilizing dye-doped 90°-twisted nematic liquid crystals (90°-TNLCs). Despite a slight decrease in light intensity under an electric stimulus, the polarization rotators maintain a consistently high DoLP due to the dichroic dye's absorption anisotropy and the selective absorption of elliptically polarized transmitted light along the short axis. This mechanism effectively migrated the degradation of DoLP. Additionally, we investigated the comparative absorption characteristics between 90°-twisted nematic and homogeneous alignment LCs. This pioneering innovation offers unprecedented versatility in linear polarization control, which paves the way for advanced application in polarization modulation technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 205-211"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620415","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":"Phase-modulated quantum routing with a giant atom","authors":"Shu-Qing Mo ,&nbsp;Guo-An Yan ,&nbsp;Hua Lv","doi":"10.1016/j.cjph.2025.02.010","DOIUrl":"10.1016/j.cjph.2025.02.010","url":null,"abstract":"<div><div>The coupling between giant atoms and waveguides is of great significance in quantum information science. We utilize a giant atom coupled with two waveguides to achieve a highly efficient, secure, and directional addressing quantum routing scheme. By adjusting the phases, single-photon transmission rates with high efficiencies can be obtained. Moreover, a potential implementing platform for our theoretical scheme is proposed based on the superconducting circuit. The feasibility of the proposed platform is confirmed by careful numerical selection and analysis. We hope that the research can potentially contribute to the development of future quantum networks.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 44-52"},"PeriodicalIF":4.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562843","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":"Fluid modeling of the atmospheric pressure helium direct current microdischarge coupled with the two-term Boltzmann equation","authors":"Ying Wang ,&nbsp;Ye Tian ,&nbsp;K.M. Rabadanov ,&nbsp;A.A. Kudryavtsev ,&nbsp;Chengxun Yuan","doi":"10.1016/j.cjph.2025.02.018","DOIUrl":"10.1016/j.cjph.2025.02.018","url":null,"abstract":"<div><div>We examine the Space-Dependent Electron Energy Distribution Function model coupled with plasma fluid equation for atmospheric pressure direct current microdischarge in helium. The simulation were performed in COMSOL Multiphysics using Plasma Module. In the model, the Boltzmann equation in the classical two-term approximation is solved for each position of the discharge region and is coupled with the plasma fluid equations by way of the electron mean energy. Utilizing initial data derived from the Boltzmann equation solution, the rate constants and transport coefficients are computed, which are used in the fluid model, thus closing the computational loop. To validate this approach, we compare simulation results with both the outcomes of the “local mean energy approximation” model and experimental data. Here we show that simulation results exhibit good agreement with experimental results, underscoring the fidelity of using coupled computational approach. Furthermore, disparities between using here the Space-Dependent Electron Energy Distribution Function model and the “local mean energy approximation” model highlight the importance of considering self-consistent computational approaches in atmospheric pressure microdischarge modeling and analysis.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 298-305"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644586","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":"A thermodynamic model for dark energy including particle creation or destruction processes","authors":"José Medeiros da Costa Netto,&nbsp;Heydson Henrique Brito da Silva","doi":"10.1016/j.cjph.2025.02.007","DOIUrl":"10.1016/j.cjph.2025.02.007","url":null,"abstract":"<div><div>Thermodynamic analyses of dark energy as a relativistic fluid indicates that this intriguing component of the universe mimics a bulk viscous pressure when the parameter of its barotropic equation of state varies with time. Since in cosmology bulk viscosity and creation or destruction of matter are closely linked processes, we propose in this work a brief thermodynamic study of dark energy considering that particles can be created or destroyed in the fluid. We derive new expressions for quantities such as particle density, entropy density etc. that have been shown to be sensitive to this new ingredient. We also obtain new thermodynamic constraints and compare them with those where the number of particles is conserved. In particular, we found that in the presence of a sink, dark energy tends towards the cosmological constant over time regardless of the sign of its chemical potential and without violating the laws of thermodynamics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 684-689"},"PeriodicalIF":4.6,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519681","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":"Possible existence of ghost stars in the context of electromagnetic field","authors":"Tayyab Naseer ,&nbsp;K. Hassan ,&nbsp;M. Sharif","doi":"10.1016/j.cjph.2025.02.009","DOIUrl":"10.1016/j.cjph.2025.02.009","url":null,"abstract":"<div><div>In this paper, we discuss the existence of ghost star models in the Einstein–Maxwell framework. In order to explore these objects, we put forward the idea of Zeldovich and Novikov by keeping in mind that the energy density of such models lie in the negative range in some regions of the spacetime geometry. We proceed by taking into account a static sphere and develop the field equations for a charged anisotropic fluid configuration. The two generating functions are then considered and we rewrite the field equations in terms of the mass and these physical quantities. Afterwards, we formulate two different models using the conformally flatness condition along with the considered generating functions. Further, we adopt the vanishing complexity constraint as well as null active gravitational mass to find two more solutions. The energy density for all developed models is also graphically shown. We conclude that the ghost stars exist in the presence of charge as the energy density for all the resulting solutions lie in the negative region for a particular range of the radial coordinate.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 594-608"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480007","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":"Charged analogues of singularity-free anisotropic compact stars under linear f(Q)-action","authors":"Debadri Bhattacharjee,&nbsp;Pradip Kumar Chattopadhyay","doi":"10.1016/j.cjph.2025.02.008","DOIUrl":"10.1016/j.cjph.2025.02.008","url":null,"abstract":"<div><div>This study simulates the characteristics of spherically symmetric, anisotropic compact stellar bodies with electrical charge within the framework of the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> theory of gravity. Employing the Krori–Barua metric ansatz (K.D. Krori, J. Barua, J. Phys. A: Math. Gen. 8 (1975) 508) along with a linear form of <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> model, <em>viz.</em>, <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow><mo>=</mo><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>+</mo><msub><mrow><mi>α</mi></mrow><mrow><mn>1</mn></mrow></msub><mi>Q</mi></mrow></math></span>, we obtain a tractable set of exact relativistic solutions of the field equations. A specific form of charge <span><math><mrow><mo>(</mo><mi>q</mi><mo>=</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><msup><mrow><mi>r</mi></mrow><mrow><mn>3</mn></mrow></msup><mo>)</mo></mrow></math></span> is considered here for the present analysis. It is noted that the model is valid up to the value of charge intensity <span><math><mrow><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>≤</mo><mn>0</mn><mo>.</mo><mn>0009</mn><mspace></mspace><msup><mrow><mi>Km</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>. Beyond this value, the model does not permit physically viable results. We have obtained the best fit equation of state in the model, which is incorporated to solve the TOV equations numerically to determine the mass–radius relation within the parameter space used here. With increasing charge intensity <span><math><mrow><mo>(</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo></mrow></math></span> from 0.0002 to 0.0009, the maximum mass ranges from 2.84–<span><math><mrow><mn>2</mn><mo>.</mo><mn>92</mn><mspace></mspace><msub><mrow><mi>M</mi></mrow><mrow><mo>⊙</mo></mrow></msub></mrow></math></span>, and the corresponding radii range from 12.00–12.20 Km. Moreover, the predicted radii of some recently observed pulsars and GW 190814 show that our model also complies with the estimated radii based on the observational results. Our model is found to satisfy all the characteristic features, such as behaviour of matter variables, causality condition, energy constraints and stability criteria, which are pertinent in the context of a stable stellar configuration to emerge as a viable and physically acceptable stellar model in the framework of <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 650-669"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487057","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":"Extended Tolman–Oppenheimer–Volkoff Equation in f(R,A) gravity","authors":"Amjad Hussain ,&nbsp;Mushtaq Ahmad ,&nbsp;M. Farasat Shamir ,&nbsp;Adnan Malik ,&nbsp;Fatemah Mofarreh","doi":"10.1016/j.cjph.2025.02.006","DOIUrl":"10.1016/j.cjph.2025.02.006","url":null,"abstract":"<div><div>This paper provides a more general version of the Tolman–Oppenheimer–Volkoff equation that shows the hydrostatic equilibrium in the context of the gravitational theory <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>A</mi><mo>)</mo></mrow></mrow></math></span>. This theory is one of several modified theories of gravity that have been proposed. Anisotropic matter content is considered to investigate the compact objects’ equilibrium structure. This work is focused on the linear model <span><math><mrow><mi>R</mi><mo>+</mo><mi>α</mi><mi>A</mi></mrow></math></span>, in which <span><math><mi>R</mi></math></span> is the Ricci scalar, <span><math><mi>A</mi></math></span> is the anticurvature scalar, and <span><math><mi>α</mi></math></span> is the coupling factor. To solve the modified Tolman–Oppenheimer–Volkoff equation, we obtained suitable metric potential functions using the Karmarkar condition and employing an appropriate equation of state. We also determine an extended mass function by using the field equations. In this work, we have found a numerical solution of the dimensionless Tolman–Oppenheimer–Volkoff equation and plotted the mass–radius relation alongside several physical quantities, including radial pressure, mass function, scalar curvature, anisotropy, and the force acting on the system. We conduct the entire analysis using three compact stars: Cen X-3, Her X-1, and LMC X-4. Due to the complexity of the Tolman–Oppenheimer–Volkoff equations, we have employed the numerical technique to find various unknowns that appeared in the problem.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 609-626"},"PeriodicalIF":4.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480008","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":"Multi-party semi-quantum private comparison protocol of size relation based on d-dimensional single-particle states","authors":"Li-Hua Gong ,&nbsp;Yan-Yan Liu ,&nbsp;Jie-Hui Huang ,&nbsp;Yuan-Zhi Wang","doi":"10.1016/j.cjph.2025.02.005","DOIUrl":"10.1016/j.cjph.2025.02.005","url":null,"abstract":"<div><div>Based on <span><math><mi>d</mi></math></span>-dimensional single-particle states, a new multi-party semi-quantum private comparison protocol is proposed. With the intervention of a semi-honest third party, multiple classical parties can determine the size relation to their respective privacies by executing the proposed protocol once. The remarkable feature of our protocol is that each classical participant only performs the unitary operation and the quantum rearrangement operation, which diminishes the utilization of quantum resources. The operations in the protocol are simulated on the IBM Quantum Computing Platform, and the simulation results manifest that the presented protocol is correct and workable. Moreover, this protocol attains a qubit efficiency of 16.67%. Finally, the security analysis testifies that our proposed protocol is robust against diverse outside and inside attacks.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"94 ","pages":"Pages 471-486"},"PeriodicalIF":4.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428620","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 modulation of the electronic properties of MoSi2N4/CdS heterostructure by interlayer spacing, strain, and electric field: A first-principles investigations","authors":"Xuewen Wang ,&nbsp;Syed Awais Ahmad ,&nbsp;Muhammad Hilal ,&nbsp;Weibin Zhang","doi":"10.1016/j.cjph.2025.02.014","DOIUrl":"10.1016/j.cjph.2025.02.014","url":null,"abstract":"<div><div>In this work, the variation in the electronic properties of the MoSi₂N₄/CdS heterostructure with interlayer spacing, strain, and external electric field are investigated using first-principles methods. The MoSi₂N₄/CdS heterostructure is an indirect bandgap semiconductor with a band gap of 1.31 eV, work function of 5.45 eV, and Type II band edge alignment. As the interlayer spacing decreases, when <em>D_Z</em>-<em>D</em> (the difference between the actual interlayer spacing <em>D_Z</em> and the equilibrium spacing <em>D</em> = 3.2 Å) is -0.5 Å, the band gap increases to a maximum value of 1.55 eV. Then, the band gap gradually decreases to 0 eV at <em>D_Z-D</em> = -1.5 Å. When the compressive strain increases, the band gap increases to a maximum value of 1.93 eV at a stress of -4%, then gradually decreases to 1.28 eV. When an external electric field is applied, the band gap decreases to 0.68 eV with an increased positive electric field (MoSi₂N₄ layer pointing perpendicularly to the CdS layer). However, with a negative electric field, the band gap increases to the maximum value of 1.7 eV at the electric field strength of -0.3 V/Å, gradually decreasing to 0 eV. Based on the electron density difference, the density of state, projected band structure, mechanisms of band gap changes, and band edge alignment variations are analyzed. This paper found that by adjusting the interlayer spacing, applying planar biaxial strain, and applying external electric fields, the band gap and heterostructure type of the MoSi₂N₄/CdS heterostructure can be effectively tuned, providing theoretical references and new options for applications such as flexible electronic devices and wearable technology.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 1-16"},"PeriodicalIF":4.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548089","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}