Physics Letters A最新文献

{"title":"A fully symmetric solar absorber for thermophotovoltaic power generation","authors":"Dongyang Yan ,&nbsp;Chaojun Tang ,&nbsp;Zao Yi ,&nbsp;Junqiao Wang ,&nbsp;Boxun Li","doi":"10.1016/j.physleta.2025.130461","DOIUrl":"10.1016/j.physleta.2025.130461","url":null,"abstract":"<div><div>The swift pace of industrial growth has significantly increased the demand for renewable and clean energy sources. The efficient use of solar energy, a renewable and clean resource, can significantly advance national development. Enhancing solar energy absorption and utilization efficiency is a crucial research focus due to its current low efficiency. This study introduces a broadband solar absorber utilizing a pyramid structure, with its absorption characteristics simulated via the Finite Difference Time Domain (FDTD) method. The chosen wavelength range spans from 280 nm to 3000 nm. Within the 280 nm to 2097 nm range, the absorber achieves an ultra-high average absorption rate exceeding 99.73 %. In the 280 nm - 3000 nm range, the average absorption rate is higher than 99.55 %.Furthermore, the absorber exhibits an exceptional absorption rate exceeding 99.99 % in the 300 nm - 334 nm wavelength range. Analysis of electric and magnetic fields reveals that the high absorption efficiency is mainly due to propagating surface plasma resonance at the center W pyramid, gap surface plasma resonance between each pyramid, and surface plasma resonance between the W pyramid and the dielectric layer. Additionally, when the temperature reaches up to 1000 K, the absorber demonstrates a thermal radiation efficiency of 95.90 %. Under AM1.5 illumination conditions, absorption within the 280 nm to 3000 nm band surpasses 99.56 %. The absorber maintains high absorption levels across incident angles from 0° to 30° and is insensitive to polarization. The proposed structure offers novel perspectives for the advancement of metamaterial - based solar energy conversion devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130461"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Nonmonotonic d-wave gap effects on critical parameters in cuprate superconductors","authors":"Orifjon Ganiev ,&nbsp;Bakhrom Yavidov","doi":"10.1016/j.physleta.2025.130451","DOIUrl":"10.1016/j.physleta.2025.130451","url":null,"abstract":"<div><div>We study the impact of nonmonotonic <em>d</em>-wave superconducting gap symmetry, incorporating higher-order harmonics beyond the typical <em>d</em>-wave form, on the properties of cuprate superconductors. Key superconducting parameters (superfluid density, <span><math><msub><mrow><mi>ρ</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>, critical current density, <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, London penetration depth, <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span>, and upper critical field, <span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi><mn>2</mn></mrow></msub></math></span>) were calculated using the Chandrasekhar-Einzel approach, incorporating the temperature and angular dependence of the superconducting gap. Results reveal a non-monotonic <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> dependence on the <span><math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>6</mn><mi>θ</mi><mo>)</mo></math></span> term contribution, suggesting an optimal balance between <span><math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>2</mn><mi>θ</mi><mo>)</mo></math></span> and <span><math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>6</mn><mi>θ</mi><mo>)</mo></math></span> for maximizing <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. The temperature dependence of the London penetration depth is significantly influenced by the nonmonotonic <em>d</em>-wave gap. While the pure <em>d</em>-wave model accurately describes superfluid density of pure Bi-2212, deviations emerge in optimally doped Tl-2201 and are pronounced in electron-doped Sr_0.9La_0.1CuO₂. Calculated <span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi><mn>2</mn></mrow></msub><mo>(</mo><mi>T</mi><mo>)</mo></math></span> values agree well with experimental data from Bi2201 and Tl-2201, particularly at low temperatures where the pure <em>d</em>-wave model deviates, emphasizing the importance of higher-order harmonics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130451"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Theoretical study of tunable spin-selective terahertz perfect absorption via dual-magnetic-dipoles resonance in an l-shaped metasurface","authors":"Ying-Hua Wang ,&nbsp;Xin-Yue Sun ,&nbsp;Hui Zheng ,&nbsp;Xia Zhang ,&nbsp;Shi-Tong Xu ,&nbsp;Zheng-Gao Dong","doi":"10.1016/j.physleta.2025.130463","DOIUrl":"10.1016/j.physleta.2025.130463","url":null,"abstract":"<div><div>Spin‐selective absorption metasurfaces for incident circularly polarized (CP) waves represent a significant research focus in optics. In this study, an L‐shaped metasurface is proposed that achieves perfect spin‐selective absorption in the terahertz (THz) band. Consequently, the absorption efficiencies for right‐handed and left‐handed CP waves attain values of up to 99.9 % and 99.5 % at 0.28 THz and 0.35 THz, respectively. Correspondingly, maximum circular dichroism values of 0.85 and.86 are observed at the two resonant frequencies. Furthermore, two graphene strips were deposited on the upper surface of the dielectric substrate, demonstrating that both spin‐selective absorption and circular dichroism can be flexibly tuned by altering the Fermi energy. The resulting metasurface, featuring tunable and spin‐selective perfect absorption properties, holds promise for applications in wireless communications, terahertz sensing, and imaging.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130463"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Integrating analytical and numerical methods for studying the MGBF model's complex dynamics","authors":"Mostafa M.A. Khater","doi":"10.1016/j.physleta.2025.130453","DOIUrl":"10.1016/j.physleta.2025.130453","url":null,"abstract":"<div><div>This study presents an in-depth analytical examination of the modified generalized Burgers-Fisher (MGBF) equation, emphasizing its intrinsic mathematical properties and multifaceted applications in hydrodynamics and signal analysis. The equation, which shares structural similarities with classical Burgers and Fisher formulations, exhibits distinct nonlinear characteristics that warrant comprehensive exploration. By employing advanced mathematical frameworks, specifically the modified Khater (MKhat) methodology and the unified formulation (UF) approach, this analysis derives exact analytical solutions to the governing equations.</div><div>The validation protocol incorporates He's variational iteration (HVI) technique, providing a rigorous numerical benchmark for evaluating the accuracy and stability of the obtained analytical solutions. Notably, the equation's capacity to model intricate nonlinear dynamics, including solitary wave propagation and deterministic chaos, undergoes meticulous mathematical scrutiny. The strong agreement between computational and analytical outcomes substantiates the mathematical robustness of the employed methodological framework.</div><div>The significance of this investigation extends beyond theoretical mathematics, offering valuable insights into the fundamental behavior of nonlinear evolutionary systems and their real-world applications in engineering and applied sciences. The findings establish a comprehensive theoretical foundation for advancing future research on nonlinear wave phenomena, stability analysis, and engineering implementations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130453"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Investigation of equation-of-state and melting behavior of rhodium up to 200 GPa","authors":"Nguyen Trong Tam ,&nbsp;Le Thu Lam ,&nbsp;Ho Khac Hieu","doi":"10.1016/j.physleta.2025.130450","DOIUrl":"10.1016/j.physleta.2025.130450","url":null,"abstract":"<div><div>Equation-of-state (EOS) of face-centered cubic rhodium is studied using the moment method in statistical mechanics. Numerical calculations for rhodium metal have been implemented up to 200 GPa, and the bulk modulus <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and its first pressure derivative <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> have been derived by fitting our EOS prediction with the Birch-Murnaghan and Vinet EOSs. The Vinet EOS fit yields parameters <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>=</mo><mn>244.57</mn></math></span> GPa and <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>=</mo><mn>5.50</mn></math></span>, while the Birch-Murnaghan EOS fit gives <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>=</mo><mn>251.08</mn></math></span> GPa and <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>=</mo><mn>5.07</mn></math></span>. Furthermore, the pressure-dependent melting curve of rhodium has been investigated using the Force-Heat Equivalence Energy Density Principle approach, along with the obtained <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>. Our theoretical melting curve shows good agreement with ab initio one-phase calculations up to 90 GPa. The theoretical melting curve of rhodium is accurately described by the Simon-Glatzel equation as <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><msup><mrow><mo>(</mo><mn>1</mn><mo>+</mo><mi>P</mi><mo>/</mo><mn>21.8742</mn><mo>)</mo></mrow><mrow><mn>0.4891</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130450"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Resonant mode conversion in a dual-channel waveguide","authors":"Yan Wang ,&nbsp;Hainan Li ,&nbsp;Dongdong Wang","doi":"10.1016/j.physleta.2025.130457","DOIUrl":"10.1016/j.physleta.2025.130457","url":null,"abstract":"<div><div>The even and odd modes resonant conversions are investigated in waveguides with the longitudinal periodic modulation. In the single channel potential well, mode conversion with the equal parity occurs. Under a dual-channel waveguide, the mode conversions with the equal parity occur in the two channels. Especially in the case of an asymmetric double potential well, new properties emerge. The results show that mode conversions of even- and odd-parity can be achieved simultaneously in the two channels respectively, which is distinct from the single and the symmetric double potential wells. Besides, the effects of nonlinearities on the conversion process are investigated. The results show that the nonlinearities causes a shift in resonance frequency, matching of frequency offset can improve the conversion effects obviously.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130457"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Investigation of the impact of a strain-induced pseudo-magnetic field on the magneto-optical absorption spectra of monolayer 8–Pmmn borophene","authors":"Ta T. Tho ,&nbsp;Doan M. Quang ,&nbsp;Nguyen Q. Bau ,&nbsp;Bui D. Hoi","doi":"10.1016/j.physleta.2025.130446","DOIUrl":"10.1016/j.physleta.2025.130446","url":null,"abstract":"<div><div>The 8–<span><math><mi>P</mi><mi>m</mi><mi>m</mi><mi>n</mi></math></span> borophene monolayer exhibits tilted and anisotropic Dirac energy dispersion cones. In this study, we theoretically investigate the magneto-optical absorption in the presence of a perpendicular static magnetic field and mechanical strain, which is treated as a pseudo-magnetic field under certain conditions. Using perturbation theory for a degenerate electron gas at low temperatures, we derive the magneto-optical absorption coefficient. Our results show that, in the absence of strain, Landau levels and absorption spectra in the <em>K</em> and <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> valleys are identical, with no valley polarization. Valley polarization emerges only under strain and depends on the strain strength, external magnetic field, and tilt parameter. Notably, strain induces opposite shifts in the absorption spectra for the two valleys—redshift in the <em>K</em> valley and blueshift in the <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> valley—while the absorption peak intensity changes accordingly. These findings suggest potential applications in valleytronics and strain-engineered optoelectronics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130446"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Role of the extended Hilbert space in the attainability of the quantum Cramér–Rao bound for multiparameter estimation","authors":"Lorcán O. Conlon ,&nbsp;Jun Suzuki ,&nbsp;Ping Koy Lam ,&nbsp;Syed M. Assad","doi":"10.1016/j.physleta.2025.130445","DOIUrl":"10.1016/j.physleta.2025.130445","url":null,"abstract":"<div><div>The symmetric logarithmic derivative Cramér–Rao bound (SLDCRB) provides a fundamental limit to the minimum variance with which a set of unknown parameters can be estimated in an unbiased manner. It is known that the SLDCRB can be saturated provided the optimal measurements for the individual parameters commute with one another. However, when this is not the case the SLDCRB cannot be attained in general. In the experimentally relevant setting, where quantum states are measured individually, necessary and sufficient conditions for when the SLDCRB can be saturated are not known. In this setting the SLDCRB is attainable provided the SLD operators can be chosen to commute on an extended Hilbert space. However, beyond this relatively little is known about when the SLD operators can be chosen in this manner. In this paper we present explicit examples which demonstrate novel aspects of this condition. Our examples demonstrate that the SLD operators commuting on any two of the following three spaces: support space, support-kernel space and kernel space, is neither a necessary nor sufficient condition for commutativity on the extended space. We present a simple analytic example showing that the Nagaoka–Hayashi Cramér-Rao bound is not always attainable. Finally, we provide necessary and sufficient conditions for the attainability of the SLDCRB in the case when the kernel space is one-dimensional. These results provide new information on the necessary and sufficient conditions for the attainability of the SLDCRB.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130445"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extraordinary photoresponse in sub-5 nm 2D GaN tunneling field effect transistor for optical detection application","authors":"Hai-Qing Xie,&nbsp;Xin-Yue Wang,&nbsp;Kai-Yue Cui,&nbsp;Jing-Shuo Liu,&nbsp;Zhi-Qiang Fan","doi":"10.1016/j.physleta.2025.130458","DOIUrl":"10.1016/j.physleta.2025.130458","url":null,"abstract":"<div><div>We employ first-principles calculations to investigate the photoelectric properties and regulatory role of Tunneling Field Effect Transistor (TFET) with 5.1 nm two-dimensional (2D) GaN as channel material. The best photocurrent density and photoresponse could reach 4.42 mA/cm² and 13.3 mA/W, with an external quantum efficiency (EQE) of 8 % at 0.5 V bias voltage, -1.5 V gate voltage, and 6 eV energy. Moreover, the F atom adsorption could effectively enhance the photoelectric properties of GaN TFET, with the photocurrent density, photoresponse and EQE respectively up to 27.50 mA/cm², 83.1 mA/W and 49.8 %. Furthermore, by shortening channel length to 4.1 nm and 3.1 nm, the photoelectric performance of GaN TFET was not reduced. The peak photoresponse and the EQE of GaN TFET with 3.1 nm still respectively reach to 13.4 mA/W and 8.1 %. Such excellent photoresponse in 2D GaN-TFETs suggest a great potential for future optical detection and storage devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130458"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Expansion dynamics of the plume induced by a doughnut laser beam under the rigid confinement layer","authors":"Yongzhou Ge ,&nbsp;Zhenglei Yu ,&nbsp;Chang Liu ,&nbsp;Zhaopeng Tong ,&nbsp;Huaile Liu ,&nbsp;Haojie Yang ,&nbsp;Wangfan Zhou ,&nbsp;Xudong Ren","doi":"10.1016/j.physleta.2025.130454","DOIUrl":"10.1016/j.physleta.2025.130454","url":null,"abstract":"<div><div>Laser shock peening (LSP) utilizes laser-induced shock wave pressure to enhance the surface properties of metal sheets. This study simulates the plume expansion from a doughnut laser beam between a rigid confinement layer and an aluminum target, analyzing the resulting shock wave pressure distribution. The influence of the laser beam's inner and outer diameters, fluence distribution, and fluence magnitude is explored through numerical simulations. It is found that the self-interaction of the doughnut beam generates complex pressure fields, leading to multiple, time-varying shock wave pressure peaks on the target surface. The number, magnitude, and location of these peaks are significantly influenced by the inner diameter of the doughnut beam, as well as the distribution and magnitude of its fluence. Additionally, asymmetric fluence distribution results in distinct plume interactions and pressure profiles. The findings suggest that these pressure peaks can be controlled by adjusting the beam parameters.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"543 ","pages":"Article 130454"},"PeriodicalIF":2.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}