Chinese Journal of Physics最新文献

{"title":"Inverse scattering transform for the fourth-order nonlinear Schrödinger equation with fully asymmetric non-zero boundary conditions","authors":"Peng-Fei Han ,&nbsp;Kun Zhu ,&nbsp;Feng Zhang ,&nbsp;Wen-Xiu Ma ,&nbsp;Yi Zhang","doi":"10.1016/j.cjph.2025.05.021","DOIUrl":"10.1016/j.cjph.2025.05.021","url":null,"abstract":"<div><div>The inverse scattering transform is utilized to address the initial-value problem for the fourth-order nonlinear Schrödinger equation characterized by fully asymmetric non-zero boundary conditions. This work considers the fully asymmetric scenario for both asymptotic amplitudes and phases. The direct problem demonstrates the establishment of the corresponding analytic properties of eigenfunctions and scattering data. The inverse scattering problem is approached using both (left and right) Marchenko integral equations and is also formulated as the Riemann–Hilbert problem on a single sheet of the scattering variable. The temporal evolution of the scattering coefficients is subsequently deduced, revealing that in contrast to solutions with uniform amplitudes, both reflection and transmission coefficients exhibit a nontrivial time dependency here. The findings of this paper are expected to be pivotal for exploring the long-time asymptotic behavior of the fourth-order nonlinear Schrödinger solutions with significant boundary conditions.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 577-602"},"PeriodicalIF":4.6,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263450","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":"Mathematical modeling and analysis of the pulsating flow of the cerebrospinal fluid","authors":"Helan Princey C.,&nbsp;David Maxim Gururaj A.","doi":"10.1016/j.cjph.2025.05.018","DOIUrl":"10.1016/j.cjph.2025.05.018","url":null,"abstract":"<div><div>This study presents a mathematical model analyzing the cerebrospinal fluid (CSF) flow velocity, wall shear stress, and flow rate within the subarachnoid space, treating it as a porous medium in a channel. Understanding CSF dynamics is essential for neurological health, particularly in drug delivery, hydrocephalus, and neurodegenerative diseases. The perturbation technique is applied to transform the non-linear partial differential equation into an ordinary differential equation, which is then solved analytically. The findings reveal that the no-slip boundary condition and laminar pressure-driven flow in the constrained spaces lead to a parabolic velocity profile. The results indicate that the CSF flow velocity increases with increasing Darcy number and decreases with frequency, emphasizing the role of the porous resistance and pulsatile effects. A reduction in the flow rate at higher frequencies leads to impaired CSF circulation, directly contributing to inadequate waste clearance from the brain, a factor known to drive conditions such as Alzheimer’s disease and other neurodegenerative disorders. Furthermore, decreased shear stress with a higher Darcy number has significant clinical consequences, as excessive mechanical forces on the brain and spinal cord structures accelerate the progression of disorders like syringomyelia and traumatic brain injuries. These insights provide a critical foundation for developing targeted therapies for CSF-related abnormalities and optimizing treatments, such as intrathecal drug delivery.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 499-510"},"PeriodicalIF":4.6,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240124","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":"Impact of the Sagnac effect on thermodynamic and magnetocaloric properties of a rotating two-dimensional electron gas","authors":"Cleverson Filgueiras ,&nbsp;Moises Rojas ,&nbsp;Vinicius T. Pieve ,&nbsp;Edilberto O. Silva","doi":"10.1016/j.cjph.2025.05.002","DOIUrl":"10.1016/j.cjph.2025.05.002","url":null,"abstract":"<div><div>This work investigates the impact of the Sagnac effect on the thermodynamic properties of a non-interacting two-dimensional electron gas (2DEG) in a rotating sample under the influence of a uniform magnetic field. We derive an analytical expression for the energy spectrum using an effective Hamiltonian incorporating inertial forces; we apply canonical ensemble statistical mechanics to evaluate thermodynamic quantities. The results show that rotation modifies the energy levels, the application of a magnetic field leads to the formation of Landau levels further altered by rotation and gravitational mass, and thermodynamic quantities (internal energy, specific heat, free energy, entropy, magnetization, and magnetocaloric effect) exhibit a strong dependence on these parameters. In particular, the difference between effective mass <span><math><msup><mrow><mi>m</mi></mrow><mrow><mo>∗</mo></mrow></msup></math></span> and gravitational mass <span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>G</mi></mrow></msub></math></span> influences magnetization and the magnetocaloric effect, with negative rotations potentially inducing a cooling effect when these masses are distinct. We conclude that rotational effects and effective mass properties are crucial for understanding the thermodynamics of electronic systems under magnetic fields, with implications for thermal modulation in semiconductor materials.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 481-498"},"PeriodicalIF":4.6,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229989","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":"Coexistence of multifunctional reversible switching in Ti-doped ZnO RRAM","authors":"Hao Wang ,&nbsp;Jing Wang ,&nbsp;Jiahao Xue ,&nbsp;Dingming Yang ,&nbsp;Yunyao Zhang ,&nbsp;Xiaoyi Lei ,&nbsp;Shulong Wang ,&nbsp;Junfeng Yan ,&nbsp;Wu Zhao","doi":"10.1016/j.cjph.2025.05.040","DOIUrl":"10.1016/j.cjph.2025.05.040","url":null,"abstract":"<div><div>With the development of artificial intelligence, it is necessary to implement various biological functions for humanoid robots. Developing the ability to manipulate various functions within a single resistive random access memory (RRAM) will facilitate neuromorphic applications. Here, we demonstrate the coexistence and reversible conversion of volatile, non-volatile, digital, and analog states on a single device and analyze the internal mechanisms of the Ti-doped ZnO RRAM under different operating conditions. The Schottky barrier plays an important role in the self-compliance current, and the oxygen vacancy plays a leading role in the low-compliance (0.5 mA) mode. As the voltage rises to 5 V, Ohmic contact becomes the primary mechanism of the device operation in the high-compliance (≥1 mA) mode. Meanwhile, a low-power operation of about 200 nW was achieved during the Reset process in self-compliance mode. Based on this, we use a pulse voltage to simulate the long-term plasticity (LTP) and long-term depression (LTD) processes of biological synapses. The digital-to-analog conversion of devices can be utilized to represent declarative and non-declarative memory in human memory. Finally, a handwritten image-recognition task was conducted using a multilayer perceptron, achieving an average recognition accuracy of close to 93.5 %, which provides a feasible scheme for the ZnO-RRAM to adapt to complex application scenarios.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 654-663"},"PeriodicalIF":4.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279520","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":"Non-destructive direct characterization of unitary dynamics for arbitrary qubit systems","authors":"Zhiyuan Wang ,&nbsp;Zijing Zhang","doi":"10.1016/j.cjph.2025.05.041","DOIUrl":"10.1016/j.cjph.2025.05.041","url":null,"abstract":"<div><div>The ability to measure unknown quantum processes is crucial in quantum information. Standard process tomography yields information on quantum processes. However, standard process tomography is complex and inefficient when only partial information regarding quantum processes or specific matrix elements is required. We propose a parameterized quantum circuit scheme for direct measurement of any specific matrix element in unitary processes. Using the target unitary process as a high-dimensional sparse matrix, the proposed method quickly determines the required matrix elements without requiring complex reconstruction algorithms. Simultaneously, our approach is nondestructive, and the target quantum state that undergoes an unknown unitary process can be retained for reuse in subsequent measurements. We extend this method to arbitrary multi-qubit systems. Using a nuclear magnetic resonance system on the SpinQ quantum cloud platform as a case study, we experimentally demonstrate the effectiveness of the method and analyze its accuracy and precision.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 528-541"},"PeriodicalIF":4.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263447","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":"Relaxation dynamics near the order-disorder and order-order phase transitions in random crystal field Blume-Capel model","authors":"Songül Özüm ,&nbsp;Elif Sünnetci ,&nbsp;Gül Gülpınar ,&nbsp;Rıza Erdem","doi":"10.1016/j.cjph.2025.05.039","DOIUrl":"10.1016/j.cjph.2025.05.039","url":null,"abstract":"<div><div>The present study employs statistical equilibrium theory and irreversible thermodynamics to examine the relaxation dynamics of a spin-1 Blume-Capel model with a quenched random crystal field. First, the investigation focuses on the variation of the dipolar and quadrupolar order parameters as a function of the temperature and the crystal field within the mean-field approximation. It has been established that the mean-field equilibrium behavior of the model is characterized by phase diagrams exhibiting three distinct structures for varying values of the random fluctuation strength of the crystal field (<span><math><mi>α</mi></math></span>) in the temperature versus crystal field plane. The induced novel phase resulting from disorders and the subsequent first-order phase transition at higher temperatures are highlighted through the dependence of the magnetization and quadrupole moment on the crystal field. It is assumed that the system has departed from equilibrium due to a small external magnetic field, a generalized force, and a current, all defined based on the production of magnetic Gibbs free energy, to formulate the relaxation behavior. The linearized kinetic equation was derived to determine the characteristic relaxation time. The relaxation time is demonstrated as a function of temperature and the crystal field for varying values of <span><math><mi>α</mi></math></span>. The present study investigates the thermal and crystal field dependencies of relaxation times near critical, ordered critical, multicritical points, and first-order transitions. The characteristic relaxation time increases exponentially near the critical, tricritical, and isolated critical points, approaching an infinite duration.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 461-471"},"PeriodicalIF":4.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221439","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":"Understanding and passivating deep-level intrinsic defects in two-dimensional ultra-wide bandgap semiconductor AsSbO3 for enhanced optoelectronic applications","authors":"Zhu-You Liu ,&nbsp;Fu-Cheng Lu ,&nbsp;Chen Zhang ,&nbsp;Hui-Xiong Deng","doi":"10.1016/j.cjph.2025.05.031","DOIUrl":"10.1016/j.cjph.2025.05.031","url":null,"abstract":"<div><div>Recent advances in the two-dimensional ultra-wide bandgap semiconductor AsSbO₃ underscore its potential applications in high-performance machine vision, primarily due to its daylight-blind characteristics and exceptional stability. However, deep-level defects in monolayer (ML) AsSbO₃ can adversely impact critical properties such as carrier recombination and mobility in optoelectronic devices. Therefore, understanding the origins and characteristics of these defects is essential for realizing the practical applications of AsSbO₃. In this study, we utilize first-principles hybrid functional calculations to investigate the electronic structure and intrinsic defect properties of ML AsSbO₃. Our analysis shows that arsenic vacancy (<span><math><msub><mi>V</mi><mtext>As</mtext></msub></math></span>) is the deep-level defect, which is more inclined to trap electrons at the edge of the conduction band and holes at the edge of the valence band through the transition between q = 0 and q = +1, and become a potential non-radiative recombination center. Moreover, we suggest employing hydrogen for the passivation of the deep-level defect of <span><math><msub><mi>V</mi><mtext>As</mtext></msub></math></span>. This examination of deep-level defects in AsSbO₃ provides valuable theoretical insights that will inform its future applications in optoelectronic devices, facilitating its optimization for advancements in machine vision and related technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 90-99"},"PeriodicalIF":4.6,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654371","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":"Non-singular bouncing cosmology in f(T,T) gravity with energy condition violations","authors":"A. Zhadyranova ,&nbsp;M. Koussour ,&nbsp;V. Zhumabekova ,&nbsp;N. Zhusupova ,&nbsp;S. Muminov ,&nbsp;J. Rayimbaev","doi":"10.1016/j.cjph.2025.04.032","DOIUrl":"10.1016/j.cjph.2025.04.032","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The singularity and inflationary problems have posed significant challenges for understanding the universe’s origin and evolution. Bouncing cosmology has emerged as a promising alternative to standard cosmological models, offering a non-singular approach to early universe dynamics by facilitating a ”bounce” rather than a singular beginning. In this study, we explore the feasibility of modeling specific bouncing scenarios within the framework of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; gravity, allowing for a comprehensive coupling between the torsion scalar &lt;span&gt;&lt;math&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and the trace of the energy–momentum tensor &lt;span&gt;&lt;math&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;. We analyze two &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; models: a linear model &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and a non-linear model &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;msqrt&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/mrow&gt;&lt;/msqrt&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, with a parameterized scale factor &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msqrt&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/msqrt&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to capture the bounce behavior. The analysis confirms a cosmic bounce at &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, where the Hubble parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; signals a transition from contraction to expansion. A crucial condition for achieving the bounce is the violation of the null energy condition (NEC) near the bounce, enabling the equation of state (EoS) parameter to enter the phantom region (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;). Both models exhibit an increase in energy density as the universe approaches the bounce, peaking at the bounce epoch and then decreasing post-bounce. Pressure remains negative throughout, with the EoS parameter crossing into the phantom region near the bounce in both positive and negative time zones. Our findings show that NEC and strong energy condition (SEC) violations are essential for the non-singular bounce, while the dominant energy condition (DEC) is satisfied, ensuring a consistent matter distribution. These results indicate that both linear and non-linear &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; models effectively replicate the critical f","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 439-449"},"PeriodicalIF":4.6,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195775","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":"Measurement of lunar libration based on lunar laser ranging","authors":"Tianquan Gao ,&nbsp;Chengjian Luo ,&nbsp;Li Xue","doi":"10.1016/j.cjph.2025.05.030","DOIUrl":"10.1016/j.cjph.2025.05.030","url":null,"abstract":"<div><div>Lunar laser ranging (LLR) data have been extensively utilized in fundamental physics research, yielding significant and fruitful outcomes. These data hold promising potential for advancing our understanding of lunar libration. In this study, we address the challenges associated with lunar libration analysis by employing data from multiple corner reflector arrays collected over a single night, thereby utilizing a shorter time interval. We conduct a comprehensive analysis of the uncertainty associated with each corner reflector array and establish a relational model between this uncertainty and lunar libration. This approach enables the measurement of lunar libration through the uncertainty inherent in LLR data. For our calculations, we utilized a combination of different corner reflector arrays, with data sourced from the Grasse Station. Our findings reveal that the lunar libration measurements obtained using the combinations of A11+A15 and A14+A15 are 2.473° (latitude), 2.470° (longitude), and -1.607° (latitude), -5.369° (longitude) respectively. The corresponding errors for these combinations are -0.302° (latitude), -0.272° (longitude), -0.193° (latitude), and -0.278° (longitude). These results underscore the efficacy of our methodology in accurately determining lunar libration through the analysis of LLR data uncertainties.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 643-653"},"PeriodicalIF":4.6,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279519","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":"Multiple topological phase transitions in Floquet hexagonal photonic lattices","authors":"Zi-Hang Zhou,&nbsp;Xin Gao,&nbsp;Ji Cao,&nbsp;Wen-Xue Cui,&nbsp;Shou Zhang,&nbsp;Hong-Fu Wang","doi":"10.1016/j.cjph.2025.05.007","DOIUrl":"10.1016/j.cjph.2025.05.007","url":null,"abstract":"<div><div>A three-step quenched honeycomb photonic Floquet topological insulator is constructed by simulating quantum system driven by periodic Hamiltonian. The system consists of a two-dimensional microring lattice, which we map to an equivalent waveguide array with periodic boundary conditions. We explicitly derive the Floquet–Bloch Hamiltonian and propose a general approach for generating flat bands in Floquet systems, identifying key topological invariants that satisfy bulk-edge correspondence. By tuning the resonators during quenching, we demonstrate the emergence of Chern insulator, anomalous Floquet topological, and weak Floquet topological phases. The weak Floquet state arises from interactions between Floquet bands of non-adjacent periods, thereby distinguishing this system from its static counterparts.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 368-376"},"PeriodicalIF":4.6,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185064","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}