Pub Date : 2025-12-01DOI: 10.1016/j.cjph.2025.11.006
Abdullah Guvendi , Omar Mustafa , Nosratollah Jafari
We derive a relativistic wave equation for spin-1 vector bosons within the framework of Amelino-Camelia’s doubly special relativity (DSR). By implementing non-minimal substitutions, we obtain a DSR-modified two-dimensional vector boson oscillator equation, formulated in terms of a symmetric rank-two spinor. This leads to a coupled system of first-order equations, including one algebraic equation, that governs the dynamics of the modified spin-1 vector boson oscillators. From this system, we extract an exactly solvable wave equation that incorporates first-order DSR corrections. The solutions are expressed in terms of special functions, and we present a closed-form expression for the energy spectrum, which explicitly incorporates the effects of DSR. Remarkably, our results reveal mass splittings induced by DSR between spin-1 oscillator and anti-oscillator modes. Furthermore, we show that these modes manifest exclusively as rotating, ring-shaped structures. The analysis is general and applies to both the low-energy regime and the non-relativistic limit.
{"title":"The vector boson oscillator in doubly special relativity","authors":"Abdullah Guvendi , Omar Mustafa , Nosratollah Jafari","doi":"10.1016/j.cjph.2025.11.006","DOIUrl":"10.1016/j.cjph.2025.11.006","url":null,"abstract":"<div><div>We derive a relativistic wave equation for spin-1 vector bosons within the framework of Amelino-Camelia’s doubly special relativity (DSR). By implementing non-minimal substitutions, we obtain a DSR-modified two-dimensional vector boson oscillator equation, formulated in terms of a symmetric rank-two spinor. This leads to a coupled system of first-order equations, including one algebraic equation, that governs the dynamics of the modified spin-1 vector boson oscillators. From this system, we extract an exactly solvable wave equation that incorporates first-order DSR corrections. The solutions are expressed in terms of special functions, and we present a closed-form expression for the energy spectrum, which explicitly incorporates the effects of DSR. Remarkably, our results reveal mass splittings induced by DSR between spin-1 oscillator and anti-oscillator modes. Furthermore, we show that these modes manifest exclusively as rotating, ring-shaped structures. The analysis is general and applies to both the low-energy regime and the non-relativistic limit.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1046-1052"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614691","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}
Pub Date : 2025-12-01DOI: 10.1016/j.cjph.2025.10.027
Z. Fadil , A. Jabar , M. Naziruddin Khan , S. Benyoussef , L. Bahmad , Chaitany Jayprakash Raorane , Seong-Cheol Kim , Tan N. Nguyen
Using rigorous ab initio density functional theory (DFT) calculations, this work systematically investigates the structural, electronic, optical, thermoelectric, and thermodynamic properties of Cd4Te5Pb. The results confirm the stability of its crystal structure, reveal pronounced mechanical anisotropy, and indicate ductile behavior. This compound features a wide indirect band gap, which, combined with its favorable optical properties, makes it a promising candidate for optoelectronic applications. Furthermore, the thermoelectric analysis demonstrates predominantly p-type conduction and promising high-temperature energy conversion performance. Finally, the thermodynamic evaluation confirms the material’s robustness and stability at elevated temperatures.
{"title":"Integrated first-principles study of Cd4Te5Pb: structural, optical, electronic, elastic, thermoelectric and thermodynamic properties","authors":"Z. Fadil , A. Jabar , M. Naziruddin Khan , S. Benyoussef , L. Bahmad , Chaitany Jayprakash Raorane , Seong-Cheol Kim , Tan N. Nguyen","doi":"10.1016/j.cjph.2025.10.027","DOIUrl":"10.1016/j.cjph.2025.10.027","url":null,"abstract":"<div><div>Using rigorous <em>ab initio</em> density functional theory (DFT) calculations, this work systematically investigates the structural, electronic, optical, thermoelectric, and thermodynamic properties of <em>Cd</em><sub>4</sub><em>Te</em><sub>5</sub><em>Pb</em>. The results confirm the stability of its crystal structure, reveal pronounced mechanical anisotropy, and indicate ductile behavior. This compound features a wide indirect band gap, which, combined with its favorable optical properties, makes it a promising candidate for optoelectronic applications. Furthermore, the thermoelectric analysis demonstrates predominantly p-type conduction and promising high-temperature energy conversion performance. Finally, the thermodynamic evaluation confirms the material’s robustness and stability at elevated temperatures.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1193-1203"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614686","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}
Pub Date : 2025-12-01DOI: 10.1016/j.cjph.2025.11.010
S. Elgammal
In this study, we investigate the potential production of a heavy torsion field (TS) at the LHC, which stems from a simplified model rooted in Einstein-Cartan gravity, in connection with dark matter. Within this framework, the torsion field is capable of decaying into pairs of dark matter (DM) particles. Notably, one of these DM particles is heavy enough to decay into dark neutral gauge bosons (A′) alongside another DM particle. The Analysis has been performed by studying events with dimuon plus missing transverse energy produced in the simulated proton-proton collisions at the Large Hadron Collider, at 13.6 TeV center of mass energy and integrated luminosity of 52 fb corresponding to the LHC run 3 circumstances during 2022 and 2023. We provide upper limits, in case no new physics has been discovered, on the masses of various particles in the model as (A′), as well as the heavy mediator (torsion field).
{"title":"Search for the production of dark gauge bosons in the framework of Einstein-Cartan portal in the simulation of proton-proton collisions at $sqrt {s} = 13.6$ TeV","authors":"S. Elgammal","doi":"10.1016/j.cjph.2025.11.010","DOIUrl":"10.1016/j.cjph.2025.11.010","url":null,"abstract":"<div><div>In this study, we investigate the potential production of a heavy torsion field (TS) at the LHC, which stems from a simplified model rooted in Einstein-Cartan gravity, in connection with dark matter. Within this framework, the torsion field is capable of decaying into pairs of dark matter (DM) particles. Notably, one of these DM particles is heavy enough to decay into dark neutral gauge bosons (A′) alongside another DM particle. The Analysis has been performed by studying events with dimuon plus missing transverse energy produced in the simulated proton-proton collisions at the Large Hadron Collider, at 13.6 TeV center of mass energy and integrated luminosity of 52 fb<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> corresponding to the LHC run 3 circumstances during 2022 and 2023. We provide upper limits, in case no new physics has been discovered, on the masses of various particles in the model as (A′), as well as the heavy mediator (torsion field).</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1013-1023"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614692","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}
Pub Date : 2025-11-30DOI: 10.1016/j.cjph.2025.11.037
Y. Sekhmani , A. Baruah , A. Al-Badawi , S.K. Maurya , M.K. Jasim , M. Altanji , S.N. Gashti
This study explores the impact of the spin (κs), dilaton (κd), and shear (κsh) charges on the massless scalar quasinormal modes (QNMs), greybody factors, shadow behavior, and deflection angle of a four-dimensional dyonically charged black hole (BH) in metric-affine gravity (MAG) with torsion and nonmetricity (NMT). To assess the stability against perturbations, we analyze scalar QNMs of the BH in the frequency domain using the highly accurate 13th order Padé-averaged WKB method. Using appropriate parameter spaces, we study the influence of the spin, dilaton, and shear charges on the QNMs. The obtained frequency data indicate the stability of the BH against scalar perturbation. The frequencies generally decrease with increasing dilaton and shear charges; however, the damping rates exhibit nuanced behavior. The spin charge has the opposite effect on the QNMs in that the frequencies and damping rates increase with the spin charge consistently across the studied overtone range. Physically, it is interpreted that the additional charges effectively influence the stiffness of the spacetime and the propagation of gravitational waves. The QNMs estimated using the Padé-averaged WKB method exhibit good accuracy, and outliers in specific parameter ranges are highlighted. Next, we investigate the behavior of the deflection of light rays by dyonically charged BHs in MAG using the Gauss-Bonnet formalism. Using weak-field approximations and relevant constraints associated with the cosmological constant, we compute and analyze the optical quantities by altering the spin, dilaton, and shear charge parameters. Constraints on the spin (κs), dilaton (κd), and shear (κsh) charges, derived from Event Horizon Telescope observations of M87* and Sgr A*, highlight the fact that this BH model is a promising candidate for simulating astrophysical BHs.
{"title":"Quasinormal spectra, greybody factors, optical shadows, and light deflection by dyonically charged black holes in metric-affine gravity with torsion and nonmetricity","authors":"Y. Sekhmani , A. Baruah , A. Al-Badawi , S.K. Maurya , M.K. Jasim , M. Altanji , S.N. Gashti","doi":"10.1016/j.cjph.2025.11.037","DOIUrl":"10.1016/j.cjph.2025.11.037","url":null,"abstract":"<div><div>This study explores the impact of the spin (<em>κ<sub>s</sub></em>), dilaton (<em>κ<sub>d</sub></em>), and shear (<em>κ<sub>sh</sub></em>) charges on the massless scalar quasinormal modes (QNMs), greybody factors, shadow behavior, and deflection angle of a four-dimensional dyonically charged black hole (BH) in metric-affine gravity (MAG) with torsion and nonmetricity (NMT). To assess the stability against perturbations, we analyze scalar QNMs of the BH in the frequency domain using the highly accurate 13<sup>th</sup> order Padé-averaged WKB method. Using appropriate parameter spaces, we study the influence of the spin, dilaton, and shear charges on the QNMs. The obtained frequency data indicate the stability of the BH against scalar perturbation. The frequencies generally decrease with increasing dilaton and shear charges; however, the damping rates exhibit nuanced behavior. The spin charge has the opposite effect on the QNMs in that the frequencies and damping rates increase with the spin charge consistently across the studied overtone range. Physically, it is interpreted that the additional charges effectively influence the stiffness of the spacetime and the propagation of gravitational waves. The QNMs estimated using the Padé-averaged WKB method exhibit good accuracy, and outliers in specific parameter ranges are highlighted. Next, we investigate the behavior of the deflection of light rays by dyonically charged BHs in MAG using the Gauss-Bonnet formalism. Using weak-field approximations and relevant constraints associated with the cosmological constant, we compute and analyze the optical quantities by altering the spin, dilaton, and shear charge parameters. Constraints on the spin (<em>κ<sub>s</sub></em>), dilaton (<em>κ<sub>d</sub></em>), and shear (<em>κ<sub>sh</sub></em>) charges, derived from Event Horizon Telescope observations of M87* and Sgr A*, highlight the fact that this BH model is a promising candidate for simulating astrophysical BHs.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 177-198"},"PeriodicalIF":4.6,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797746","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}
Pub Date : 2025-11-29DOI: 10.1016/j.cjph.2025.11.033
I. Mallek-Zouari , A.E. Maayoufi , R. Bez , A. Kouki , N. Thabet-Mliki
Bi2Fe4O9 (BFO) was synthesized using a hydrothermal method to achieve controlled phase purity and morphology. Rietveld refinement of the X-ray diffraction (XRD) pattern confirmed the formation of a single orthorhombic phase with the Pbam space group. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses revealed plate-like particles with dimensions ranging from 140 to 170 nm along their edge. The dielectric properties were evaluated by analyzing the frequency dependence of the dielectric constant, loss tangent, and electrical conductivity. The results indicated that the optimization of synthesis parameters significantly enhanced the dielectric response of Bi2Fe4O9, resulting in improved high-frequency performance. The correlation between microstructural characteristics and dielectric properties is discussed, with an emphasis on the roles of grain boundaries, phase purity, and conductivity in determining dielectric behavior. The UV-Vis absorption spectra recorded at room temperature revealed substantial absorption within the ultraviolet range (200–400 nm). Tauc plot analysis yielded an estimated band gap value of approximately 1.97 eV. Density functional theory (DFT) calculations, performed using the generalized gradient approximation (GGA+U) with the Wien2k code, provided insights into the electronic band structure and density of states (DOS). The calculated results are in good agreement with the experimental findings. This study highlights Bi2Fe4O9 as a promising material for advanced dielectric and environmental applications.
{"title":"Investigation of the Structural, Dielectric, Optical, and Electronic Properties of Hydrothermally Synthesized Bi2Fe4O9 Multiferroic Materials","authors":"I. Mallek-Zouari , A.E. Maayoufi , R. Bez , A. Kouki , N. Thabet-Mliki","doi":"10.1016/j.cjph.2025.11.033","DOIUrl":"10.1016/j.cjph.2025.11.033","url":null,"abstract":"<div><div>Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> (BFO) was synthesized using a hydrothermal method to achieve controlled phase purity and morphology. Rietveld refinement of the X-ray diffraction (XRD) pattern confirmed the formation of a single orthorhombic phase with the <em>Pbam</em> space group. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses revealed plate-like particles with dimensions ranging from 140 to 170 nm along their edge. The dielectric properties were evaluated by analyzing the frequency dependence of the dielectric constant, loss tangent, and electrical conductivity. The results indicated that the optimization of synthesis parameters significantly enhanced the dielectric response of Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub>, resulting in improved high-frequency performance. The correlation between microstructural characteristics and dielectric properties is discussed, with an emphasis on the roles of grain boundaries, phase purity, and conductivity in determining dielectric behavior. The UV-Vis absorption spectra recorded at room temperature revealed substantial absorption within the ultraviolet range (200–400 nm). Tauc plot analysis yielded an estimated band gap value of approximately 1.97 eV. Density functional theory (DFT) calculations, performed using the generalized gradient approximation (GGA+U) with the Wien2k code, provided insights into the electronic band structure and density of states (DOS). The calculated results are in good agreement with the experimental findings. This study highlights Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> as a promising material for advanced dielectric and environmental applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 79-95"},"PeriodicalIF":4.6,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749390","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}
Pub Date : 2025-11-29DOI: 10.1016/j.cjph.2025.11.035
Dong-Xuan Zhang , Jia-Heng Ni , Yu Zhang , Li Yu , Yi-Hao Kang , Qi-Ping Su , Chui-Ping Yang
Compared to a qubit, a qutrit (a three-level or three-state quantum system) possesses a larger Hilbert space to process and store quantum information. On the other hand, large-scale qutrit-based hybrid quantum computing usually requires performing hybrid multi-qutrit quantum gates with diverse qutrits, different in their nature or in their encoding format. In this work, we consider two types of qutrits, i.e., superconducting (SC) qutrits and cat-state qutrits. We propose to implement a hybrid controlled-SUM gate with one SC qutrit simultaneously controlling multiple-target cat-state qutrits. The gate is implemented in a circuit-QED system, which is composed of an SC ququart and multiple microwave cavities. The SC ququart here refers to a four-level quantum system, with the three lowest levels forming a qutrit and an auxiliary higher energy level utilized for the coherent state manipulation. The gate implementation does not require applying a classical pulse. Because the auxiliary higher energy level of the SC ququart is only virtually excited during the gate operation, decoherence from this level is greatly suppressed. The gate is deterministic, as it requires no measurement of the cavity or SC ququart states. Moreover, the gate operational time is independent of the number of qutrits, thus it does not increase with the number of qutrits. As an application of this gate, we further discuss the generation of a hybrid maximally entangled state of one SC qutrit and multiple cat-state qutrits. We also numerically analyze the experimental feasibility of creating the hybrid entangled state of one SC qutrit and two cat-state qutrits in a circuit QED system. This proposal may be extended to accomplish the same task in other physical systems, such as a four-level artificial atom (e.g., a quantum dot, an NV center, a magnon, etc.) coupled to multiple optical or microwave cavities.
{"title":"Implementation of a hybrid controlled-SUM gate with one superconducting qutrit simultaneously controlling multiple-target cat-state qutrits","authors":"Dong-Xuan Zhang , Jia-Heng Ni , Yu Zhang , Li Yu , Yi-Hao Kang , Qi-Ping Su , Chui-Ping Yang","doi":"10.1016/j.cjph.2025.11.035","DOIUrl":"10.1016/j.cjph.2025.11.035","url":null,"abstract":"<div><div>Compared to a qubit, a qutrit (a three-level or three-state quantum system) possesses a larger Hilbert space to process and store quantum information. On the other hand, large-scale qutrit-based hybrid quantum computing usually requires performing hybrid multi-qutrit quantum gates with diverse qutrits, different in their nature or in their encoding format. In this work, we consider two types of qutrits, i.e., superconducting (SC) qutrits and cat-state qutrits. We propose to implement a hybrid controlled-SUM gate with one SC qutrit simultaneously controlling multiple-target cat-state qutrits. The gate is implemented in a circuit-QED system, which is composed of an SC ququart and multiple microwave cavities. The SC ququart here refers to a four-level quantum system, with the three lowest levels forming a qutrit and an auxiliary higher energy level utilized for the coherent state manipulation. The gate implementation does not require applying a classical pulse. Because the auxiliary higher energy level of the SC ququart is only virtually excited during the gate operation, decoherence from this level is greatly suppressed. The gate is deterministic, as it requires no measurement of the cavity or SC ququart states. Moreover, the gate operational time is independent of the number of qutrits, thus it does not increase with the number of qutrits. As an application of this gate, we further discuss the generation of a hybrid maximally entangled state of one SC qutrit and multiple cat-state qutrits. We also numerically analyze the experimental feasibility of creating the hybrid entangled state of one SC qutrit and two cat-state qutrits in a circuit QED system. This proposal may be extended to accomplish the same task in other physical systems, such as a four-level artificial atom (e.g., a quantum dot, an NV center, a magnon, etc.) coupled to multiple optical or microwave cavities.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 266-282"},"PeriodicalIF":4.6,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837438","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}
Pub Date : 2025-11-28DOI: 10.1016/j.cjph.2025.11.036
Shanjun Chen , Yifei Du , Ruijie Song , Yan Chen , Huafeng Zhang , Wei Dai , Weibin Zhang
Based on density functional theory, the structure, mechanical, optoelectronic, kinetic, thermodynamic and hydrogen storage properties of cubic A2CuH6 (A=Li, Na, K) double perovskites are studied. The lattice constants of Li2CuH6, Na2CuH6, and K2CuH6 are 6.32, 7.07, and 7.98 Å, respectively. The B/G values indicate that Li2CuH6 and K2CuH6 exhibit ductility, while Na2CuH6 exhibits brittleness. Electronic properties reveal that A2CuH6 (A=Li, Na, K) compounds have metallic nature. The optical properties of A2CuH6 show that Li2CuH6 and K2CuH6 crystals have high dielectric constants, which is beneficial for their applications as hydrogen storage. Importantly, A2CuH6 (A=Li, Na, K) materials were confirmed for their structural, dynamic, thermodynamic, and mechanical stability. Gravimetric hydrogen densities (GHD) of Li2CuH6, Na2CuH6, and K2CuH6 are 7.25, 5.23, and 4.09 wt%, respectively. The volumetric hydrogen storage capacities of Li2CuH6, Na2CuH6, and K2CuH6 are 159.06, 113.77, and 79.11 g·H2/L, respectively. Therefore, Li2CuH6 owns the highest gravimetric and volumetric hydrogen storage capacities among these compounds. This study provides a new option for designing novel copper-based hydrogen storage materials.
{"title":"First-principles investigation on the physical and hydrogen storage properties of copper-based double perovskites A2CuH6 (A=Li, Na, K) for hydrogen storage applications","authors":"Shanjun Chen , Yifei Du , Ruijie Song , Yan Chen , Huafeng Zhang , Wei Dai , Weibin Zhang","doi":"10.1016/j.cjph.2025.11.036","DOIUrl":"10.1016/j.cjph.2025.11.036","url":null,"abstract":"<div><div>Based on density functional theory, the structure, mechanical, optoelectronic, kinetic, thermodynamic and hydrogen storage properties of cubic A<sub>2</sub>CuH<sub>6</sub> (A=Li, Na, K) double perovskites are studied. The lattice constants of Li<sub>2</sub>CuH<sub>6</sub>, Na<sub>2</sub>CuH<sub>6</sub>, and K<sub>2</sub>CuH<sub>6</sub> are 6.32, 7.07, and 7.98 Å, respectively. The B/G values indicate that Li<sub>2</sub>CuH<sub>6</sub> and K<sub>2</sub>CuH<sub>6</sub> exhibit ductility, while Na<sub>2</sub>CuH<sub>6</sub> exhibits brittleness. Electronic properties reveal that A<sub>2</sub>CuH<sub>6</sub> (A=Li, Na, K) compounds have metallic nature. The optical properties of A<sub>2</sub>CuH<sub>6</sub> show that Li<sub>2</sub>CuH<sub>6</sub> and K<sub>2</sub>CuH<sub>6</sub> crystals have high dielectric constants, which is beneficial for their applications as hydrogen storage. Importantly, A<sub>2</sub>CuH<sub>6</sub> (A=Li, Na, K) materials were confirmed for their structural, dynamic, thermodynamic, and mechanical stability. Gravimetric hydrogen densities (GHD) of Li<sub>2</sub>CuH<sub>6</sub>, Na<sub>2</sub>CuH<sub>6</sub>, and K<sub>2</sub>CuH<sub>6</sub> are 7.25, 5.23, and 4.09 wt%, respectively. The volumetric hydrogen storage capacities of Li<sub>2</sub>CuH<sub>6</sub>, Na<sub>2</sub>CuH<sub>6</sub>, and K<sub>2</sub>CuH<sub>6</sub> are 159.06, 113.77, and 79.11 g·H<sub>2</sub>/L, respectively. Therefore, Li<sub>2</sub>CuH<sub>6</sub> owns the highest gravimetric and volumetric hydrogen storage capacities among these compounds. This study provides a new option for designing novel copper-based hydrogen storage materials.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 37-49"},"PeriodicalIF":4.6,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145693084","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}
Pub Date : 2025-11-27DOI: 10.1016/j.cjph.2025.11.028
Ruikang Yang , Zhiyong Xie , Yongjun Jian
Oscillatory electrokinetic microflows of third-grade fluids exhibit complex multi-physics coupling that challenges conventional microfluidic control. This work establishes a dynamic electro-magneto-hydrodynamic (EMHD) model based on the Debye-Hückel linearization and regular perturbation method. To address the high-order nonlinearity and transient characteristics of the momentum equation for third-grade fluids, the regular perturbation and Laplace transform approach are employed for the first time to solve the equation, deriving a semi-analytical solution that decouples transient startup and quasi-periodic flow regimes through term decomposition. Analysis reveals that memory effects—governed by the non-Newtonian dimensionless parameter a1, which characterizes the fluid’s shear energy storage capacity—enhance oscillatory diffusion depth while suppressing velocity amplitudes as a1 increases. Notably, domain-wide shear stress vanishes under the extreme condition a1→∞. Synergistic analysis shows that electromagnetic field tuning optimizes flow rate via the force balance condition Ha ≈ 1.6/ (obtained from isocontour maximization) and achieves the peak pumping efficiency while maintaining enhanced mixing efficiency through near-wall oscillations. This framework culminates in an optimized parameter set, providing a theoretical guideline for designing microfluidic devices that balance high pumping efficiency with enhanced mixing efficiency.
三级流体的振荡电动力学微流表现出复杂的多物理场耦合，这对传统的微流控提出了挑战。本文建立了基于debye - h ckel线性化和正则摄动方法的动态电磁-磁流体动力学模型。针对三级流体动量方程的高阶非线性和瞬态特性，首次采用正则摄动和拉普拉斯变换方法求解该方程，通过项分解得到了瞬态启动和准周期流态解耦的半解析解。分析表明，记忆效应——由表征流体剪切蓄能能力的非牛顿无量纲参数a1控制——增加了振荡扩散深度，同时随着a1的增加抑制了速度振幅。值得注意的是，在极端条件a1→∞下，全域剪应力消失。协同分析表明，电磁场调谐通过力平衡条件Ha≈1.6/η（由等轮廓最大化得到）来优化流量，并通过近壁振荡达到泵送效率峰值，同时保持了提高的混合效率。该框架最终得到了一个优化的参数集，为设计平衡高泵送效率和增强混合效率的微流体装置提供了理论指导。
{"title":"Oscillatory electro-magneto-hydrodynamics of third-grade fluid microflows","authors":"Ruikang Yang , Zhiyong Xie , Yongjun Jian","doi":"10.1016/j.cjph.2025.11.028","DOIUrl":"10.1016/j.cjph.2025.11.028","url":null,"abstract":"<div><div>Oscillatory electrokinetic microflows of third-grade fluids exhibit complex multi-physics coupling that challenges conventional microfluidic control. This work establishes a dynamic electro-magneto-hydrodynamic (EMHD) model based on the Debye-Hückel linearization and regular perturbation method. To address the high-order nonlinearity and transient characteristics of the momentum equation for third-grade fluids, the regular perturbation and Laplace transform approach are employed for the first time to solve the equation, deriving a semi-analytical solution that decouples transient startup and quasi-periodic flow regimes through term decomposition. Analysis reveals that memory effects—governed by the non-Newtonian dimensionless parameter <em>a</em><sub>1</sub>, which characterizes the fluid’s shear energy storage capacity—enhance oscillatory diffusion depth while suppressing velocity amplitudes as <em>a</em><sub>1</sub> increases. Notably, domain-wide shear stress vanishes under the extreme condition <em>a</em><sub>1</sub>→∞. Synergistic analysis shows that electromagnetic field tuning optimizes flow rate via the force balance condition <em>Ha</em> ≈ 1.6/<span><math><mi>η</mi></math></span> (obtained from isocontour maximization) and achieves the peak pumping efficiency while maintaining enhanced mixing efficiency through near-wall oscillations. This framework culminates in an optimized parameter set, providing a theoretical guideline for designing microfluidic devices that balance high pumping efficiency with enhanced mixing efficiency.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 122-138"},"PeriodicalIF":4.6,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749395","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}
Pub Date : 2025-11-26DOI: 10.1016/j.cjph.2025.11.032
Wenbin Lv , Jinyang He , Han Cao , Chudong Xu , Ming-Hui Lu
The investigation of non-Hermitian topological systems has attracted significant attention across diverse fields, including photonics and acoustics. Recent studies have demonstrated that disorder can induce topological states in otherwise trivial systems, leading to the discovery of Non-Hermitian topological Anderson insulator (NH-TAI). This study explores the effects of non-Hermitian disorder on acoustic systems through numerical simulations and theoretical calculation. Coupled acoustic cavity arrays with non-Hermitian disorder profiles in one- and two-dimensional configurations are investigated. The findings reveal that tuning the disorder strength can induce a transition from a trivial to a nontrivial topological phase. More importantly, by calculating the fractional mode charges through integration of the local density of states (LDOS) within the band gap, it is demonstrated that non-Hermitian disorder alone can induce a topological Anderson phase characterized via fractional mode charges. Additionally, the robustness of the system is confirmed by simulating structural defects. These findings are applicable to other physical platforms, such as optics, and pave a pathway for future research in non-Hermitian acoustics.
{"title":"Fractional mode charges in acoustic non-Hermitian topological Anderson insulator","authors":"Wenbin Lv , Jinyang He , Han Cao , Chudong Xu , Ming-Hui Lu","doi":"10.1016/j.cjph.2025.11.032","DOIUrl":"10.1016/j.cjph.2025.11.032","url":null,"abstract":"<div><div>The investigation of non-Hermitian topological systems has attracted significant attention across diverse fields, including photonics and acoustics. Recent studies have demonstrated that disorder can induce topological states in otherwise trivial systems, leading to the discovery of Non-Hermitian topological Anderson insulator (NH-TAI). This study explores the effects of non-Hermitian disorder on acoustic systems through numerical simulations and theoretical calculation. Coupled acoustic cavity arrays with non-Hermitian disorder profiles in one- and two-dimensional configurations are investigated. The findings reveal that tuning the disorder strength can induce a transition from a trivial to a nontrivial topological phase. More importantly, by calculating the fractional mode charges through integration of the local density of states (LDOS) within the band gap, it is demonstrated that non-Hermitian disorder alone can induce a topological Anderson phase characterized via fractional mode charges. Additionally, the robustness of the system is confirmed by simulating structural defects. These findings are applicable to other physical platforms, such as optics, and pave a pathway for future research in non-Hermitian acoustics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 96-103"},"PeriodicalIF":4.6,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749391","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}
Pub Date : 2025-11-25DOI: 10.1016/j.cjph.2025.11.026
Muhammad Idrees , Junwei Hu , Yuee Xie , Fazal Badshah , Amir Khesro , Zhen-Xia Niu , Hui-Jun Li , Fuad A. Awwad , Emad A A Ismail
This study presents a theoretical investigation of the gain-assisted rotary and lateral photon drag effects induced by bidirectional rotation in chiral nanostructures composed of laterally coupled CdSe/ZnS semiconductor double quantum dot molecules. The system is driven by a combination of probe and control electromagnetic fields, where electron tunneling strength plays a pivotal role in shaping the optical, chiral, and gain-assisted responses. The chiral medium exhibits strong magnetoelectric coupling and structural asymmetry, enabling dynamic control over the rotary and lateral photon drag effects for both left- and right-circularly polarized (LCP and RCP) beams. Notably, the bidirectional rotation of the chiral nanostructure significantly enhances the drag response, with the degree of enhancement being strongly dependent on the tunneling strength. A large negative group index is observed, particularly for the RCP beam, indicating the presence of anomalous dispersion, medium gain, and high sensitivity to rotational dynamics. Additionally, the lateral photon drag demonstrates tunable beam displacement under varying tunneling strengths, offering an additional degree of control in light manipulation. Furthermore, the divergence angle between LCP and RCP beams, as well as the group indices, are shown to vary with the phase of the control field and magnetic field detuning. The electric and magnetic susceptibilities, along with the chiral coefficients, reveal enhanced dispersion and reduced absorption (even showing gain) at higher tunneling strengths. These results highlight the critical role of chirality, tunneling, gain, and rotational control in modulating light-matter interactions and pave the way for practical applications in lateral beam steering, optical communication, polarization encoding, optical tweezers, and chiral sensing technologies.
{"title":"Gain-assisted enhanced rotary and lateral photon drags in bidirectionally rotating chiral nanostructures","authors":"Muhammad Idrees , Junwei Hu , Yuee Xie , Fazal Badshah , Amir Khesro , Zhen-Xia Niu , Hui-Jun Li , Fuad A. Awwad , Emad A A Ismail","doi":"10.1016/j.cjph.2025.11.026","DOIUrl":"10.1016/j.cjph.2025.11.026","url":null,"abstract":"<div><div>This study presents a theoretical investigation of the gain-assisted rotary and lateral photon drag effects induced by bidirectional rotation in chiral nanostructures composed of laterally coupled CdSe/ZnS semiconductor double quantum dot molecules. The system is driven by a combination of probe and control electromagnetic fields, where electron tunneling strength plays a pivotal role in shaping the optical, chiral, and gain-assisted responses. The chiral medium exhibits strong magnetoelectric coupling and structural asymmetry, enabling dynamic control over the rotary and lateral photon drag effects for both left- and right-circularly polarized (LCP and RCP) beams. Notably, the bidirectional rotation of the chiral nanostructure significantly enhances the drag response, with the degree of enhancement being strongly dependent on the tunneling strength. A large negative group index is observed, particularly for the RCP beam, indicating the presence of anomalous dispersion, medium gain, and high sensitivity to rotational dynamics. Additionally, the lateral photon drag demonstrates tunable beam displacement under varying tunneling strengths, offering an additional degree of control in light manipulation. Furthermore, the divergence angle between LCP and RCP beams, as well as the group indices, are shown to vary with the phase of the control field and magnetic field detuning. The electric and magnetic susceptibilities, along with the chiral coefficients, reveal enhanced dispersion and reduced absorption (even showing gain) at higher tunneling strengths. These results highlight the critical role of chirality, tunneling, gain, and rotational control in modulating light-matter interactions and pave the way for practical applications in lateral beam steering, optical communication, polarization encoding, optical tweezers, and chiral sensing technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 25-36"},"PeriodicalIF":4.6,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145693083","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}
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