Pub Date : 2025-02-13DOI: 10.1016/j.physleta.2025.130341
Kristen Stojak Repa
Over the past several decades several contaminants, such as heavy metals, pharmaceuticals, microplastics, dyes, sunscreens, and other byproducts of industrial applications leech into the environment in a variety of ways. There are many methods of removal, but one of the most promising is via magnetic separation, whereby the contaminant and magnetic materials are connected to each other and then removed via external magnetic field. This method of removal tends to be relatively inexpensive, straightforward, and highly adaptable. Furthermore, many of the candidate materials involve iron oxides, which are generally environmentally friendly. This perspective aims to provide a brief overview of recent history with regard to magnetic materials for environmental remediation.
{"title":"Perspectives on the use of magnetic materials for environmental remediation: A mini review","authors":"Kristen Stojak Repa","doi":"10.1016/j.physleta.2025.130341","DOIUrl":"10.1016/j.physleta.2025.130341","url":null,"abstract":"<div><div>Over the past several decades several contaminants, such as heavy metals, pharmaceuticals, microplastics, dyes, sunscreens, and other byproducts of industrial applications leech into the environment in a variety of ways. There are many methods of removal, but one of the most promising is via magnetic separation, whereby the contaminant and magnetic materials are connected to each other and then removed via external magnetic field. This method of removal tends to be relatively inexpensive, straightforward, and highly adaptable. Furthermore, many of the candidate materials involve iron oxides, which are generally environmentally friendly. This perspective aims to provide a brief overview of recent history with regard to magnetic materials for environmental remediation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130341"},"PeriodicalIF":2.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428899","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}
Pub Date : 2025-02-13DOI: 10.1016/j.physleta.2025.130353
Haitao Chen , Zenghui Gao
The theoretical expression of the Gaussian Schell-model (GSM) edge dislocation beam propagating in atmosphere has been deduced, which is employed to discuss the emergence and evolution of Stokes vortices from the host beam. It is shown that Stokes vortices appear as the beam propagates in atmospheric turbulence. The variation both in positions and the degrees of polarization of the Stokes vortices may occur with propagation of the beam. The pairs of S12 Stokes vortices, S23 Stokes vortices or S31 Stokes vortices with opposite charge may create or annihilate with change of propagation distance or initial beam parameters, for instance, the slope and the off-axis parameter of the edge dislocation, or the transversal correlation length of the beam.
{"title":"Emergence of Stokes vortices from partially coherent edge dislocation beam propagating in turbulent atmosphere","authors":"Haitao Chen , Zenghui Gao","doi":"10.1016/j.physleta.2025.130353","DOIUrl":"10.1016/j.physleta.2025.130353","url":null,"abstract":"<div><div>The theoretical expression of the Gaussian Schell-model (GSM) edge dislocation beam propagating in atmosphere has been deduced, which is employed to discuss the emergence and evolution of Stokes vortices from the host beam. It is shown that Stokes vortices appear as the beam propagates in atmospheric turbulence. The variation both in positions and the degrees of polarization of the Stokes vortices may occur with propagation of the beam. The pairs of <em>S</em><sub>12</sub> Stokes vortices, <em>S</em><sub>23</sub> Stokes vortices or <em>S</em><sub>31</sub> Stokes vortices with opposite charge may create or annihilate with change of propagation distance or initial beam parameters, for instance, the slope and the off-axis parameter of the edge dislocation, or the transversal correlation length of the beam.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"538 ","pages":"Article 130353"},"PeriodicalIF":2.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420431","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}
Pub Date : 2025-02-12DOI: 10.1016/j.physleta.2025.130351
Wenming Qi , Wei Xu , Hadiqam Abdugopur , Guihua Lu , Lai Wei , Peng Li , Min Gao
The simple cubic structure and highly ionic bonding characteristics of Alkali halide NaBr have garnered significant attention in the field of fundamental physics. Previous X-ray diffraction studies revealed a phase transition from B1 to B33 phase in NaBr under pressure. However, the experimental determination of the phase transition pressure suffered from large errors due to the absence of a pressure transfer medium and high-water absorption in NaBr samples. To overcome these limitations, we employ DFT calculations to investigate the phase transition behavior of NaBr up to 40 GPa. Our theoretical analysis reveals a “first-order” phase transition at 25 GPa and provides comprehensive insights into the pressure-dependent physical properties.
{"title":"Structural phase transition and physical properties in NaBr under high pressure","authors":"Wenming Qi , Wei Xu , Hadiqam Abdugopur , Guihua Lu , Lai Wei , Peng Li , Min Gao","doi":"10.1016/j.physleta.2025.130351","DOIUrl":"10.1016/j.physleta.2025.130351","url":null,"abstract":"<div><div>The simple cubic structure and highly ionic bonding characteristics of Alkali halide NaBr have garnered significant attention in the field of fundamental physics. Previous X-ray diffraction studies revealed a phase transition from B1 to B33 phase in NaBr under pressure. However, the experimental determination of the phase transition pressure suffered from large errors due to the absence of a pressure transfer medium and high-water absorption in NaBr samples. To overcome these limitations, we employ DFT calculations to investigate the phase transition behavior of NaBr up to 40 GPa. Our theoretical analysis reveals a “first-order” phase transition at 25 GPa and provides comprehensive insights into the pressure-dependent physical properties.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"538 ","pages":"Article 130351"},"PeriodicalIF":2.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427913","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}
Pub Date : 2025-02-12DOI: 10.1016/j.physleta.2025.130350
Liang Xiang, Lijun Song
We conduct a numerical analysis of how symmetric Pearcey beam (SPB) propagates in fractional media with the linear potential. The results reveal that the transmission distance of the beam keeping the soliton shape can be adjusted by adjusting the Lévy index α. Beam's transmission trajectory can be controlled by adjusting the constant linear potential γ, the cosine linear potential b, and the linear chirp A. By adjusting the off-axis distance and topological charge of the optical vortex, we can enhance the beam's maximum intensity and control its peak position. And the energy flow of SPB can be characterized by Poynting vector. Additionally, by adjusting the truncation coefficient σ, we can control the number of side lobes and ensure the beam propagates with soliton characteristics in the x = y plane. Our work could be applied in various fields such as optical communication, laser energy focusing, optical trapping, and so on.
{"title":"Propagation dynamics of symmetric Pearcey beam in fractional media with the linear potential","authors":"Liang Xiang, Lijun Song","doi":"10.1016/j.physleta.2025.130350","DOIUrl":"10.1016/j.physleta.2025.130350","url":null,"abstract":"<div><div>We conduct a numerical analysis of how symmetric Pearcey beam (SPB) propagates in fractional media with the linear potential. The results reveal that the transmission distance of the beam keeping the soliton shape can be adjusted by adjusting the Lévy index α. Beam's transmission trajectory can be controlled by adjusting the constant linear potential γ, the cosine linear potential b, and the linear chirp A. By adjusting the off-axis distance and topological charge of the optical vortex, we can enhance the beam's maximum intensity and control its peak position. And the energy flow of SPB can be characterized by Poynting vector. Additionally, by adjusting the truncation coefficient σ, we can control the number of side lobes and ensure the beam propagates with soliton characteristics in the <em>x</em> = <em>y</em> plane. Our work could be applied in various fields such as optical communication, laser energy focusing, optical trapping, and so on.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130350"},"PeriodicalIF":2.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474971","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}
Pub Date : 2025-02-11DOI: 10.1016/j.physleta.2025.130347
Munehisa Sekikawa , Naohiko Inaba
This Letter investigates the canards generated by a slow–fast hard-type van der Pol oscillator numerically. “Hard-type” oscillators are those that can simultaneously exhibit a stable equilibrium, a stable relaxation oscillation, and an unstable limit cycle; the possibility of this coexistence is due to the structure of the oscillator that contains a nonlinear element characterized by a fifth-order polynomial. In this Letter, we create a two-parameter bifurcation diagram in which both supercritical and subcritical Andronov–Hopf bifurcations and canard explosions are confirmed. We observe that the stable canard in this oscillator exhibits two explosion events. Furthermore, the oscillator exhibits an unstable canard, which also exhibits an explosion. These stable and unstable canards transform into large oscillations and disappear via a saddle-node bifurcation. We note that both the two sequential canard explosions as well as the unstable canard observed here represent novel phenomena that have not been observed prior to this work.
{"title":"Numerical study of stable and unstable canards in a slow–fast hard-type van der Pol oscillator","authors":"Munehisa Sekikawa , Naohiko Inaba","doi":"10.1016/j.physleta.2025.130347","DOIUrl":"10.1016/j.physleta.2025.130347","url":null,"abstract":"<div><div>This Letter investigates the canards generated by a slow–fast hard-type van der Pol oscillator numerically. “Hard-type” oscillators are those that can simultaneously exhibit a stable equilibrium, a stable relaxation oscillation, and an unstable limit cycle; the possibility of this coexistence is due to the structure of the oscillator that contains a nonlinear element characterized by a fifth-order polynomial. In this Letter, we create a two-parameter bifurcation diagram in which both supercritical and subcritical Andronov–Hopf bifurcations and canard explosions are confirmed. We observe that the stable canard in this oscillator exhibits two explosion events. Furthermore, the oscillator exhibits an unstable canard, which also exhibits an explosion. These stable and unstable canards transform into large oscillations and disappear via a saddle-node bifurcation. We note that both the two sequential canard explosions as well as the unstable canard observed here represent novel phenomena that have not been observed prior to this work.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"538 ","pages":"Article 130347"},"PeriodicalIF":2.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420429","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}
Pub Date : 2025-02-11DOI: 10.1016/j.physleta.2025.130344
D.E. Saldanha-Bautista , André C.A. Siqueira , G. Palacios , E. Padrón-Hernández
Scientific exploration amalgamates nonlinear optics and magnetic phenomena, revealing a juncture where solitons emerge as distinct entities transcending multiple disciplines. In this study, we explore the nonlinear characteristics of non-exchange magnetostatic spin waves (MSW) generated within a micrometer-sized ferromagnetic hollow tube through four-magnon self-action processes. The study was based on the dynamical equations that capture the evolution of both, angular and longitudinal envelope solitons while expanding the dispersion relation near the resonance. The Analytical calculations are specifically focused on ferromagnetic structures employing Permalloy, . This study is new in the literature, perhaps due to the geometry adopted, opening a wide spectrum of applications in spintronics.
{"title":"Angular surface magnetostatic spin wave envelope soliton in a micrometer-sized tube","authors":"D.E. Saldanha-Bautista , André C.A. Siqueira , G. Palacios , E. Padrón-Hernández","doi":"10.1016/j.physleta.2025.130344","DOIUrl":"10.1016/j.physleta.2025.130344","url":null,"abstract":"<div><div>Scientific exploration amalgamates nonlinear optics and magnetic phenomena, revealing a juncture where solitons emerge as distinct entities transcending multiple disciplines. In this study, we explore the nonlinear characteristics of non-exchange magnetostatic spin waves (MSW) generated within a micrometer-sized ferromagnetic hollow tube through four-magnon self-action processes. The study was based on the dynamical equations that capture the evolution of both, angular and longitudinal envelope solitons while expanding the dispersion relation near the resonance. The Analytical calculations are specifically focused on ferromagnetic structures employing Permalloy, <span><math><mi>N</mi><msub><mrow><mi>i</mi></mrow><mrow><mn>80</mn></mrow></msub><mi>F</mi><msub><mrow><mi>e</mi></mrow><mrow><mn>20</mn></mrow></msub></math></span>. This study is new in the literature, perhaps due to the geometry adopted, opening a wide spectrum of applications in spintronics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"537 ","pages":"Article 130344"},"PeriodicalIF":2.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395372","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}
Pub Date : 2025-02-10DOI: 10.1016/j.physleta.2025.130345
Bilal Ahmed , Muhammad Bilal Tahir , Muhammad Sagir , N. Dhahri
There has been a lot of recent interest on hydrogen storage due to the fact that hydrogen may be utilized as an energy source. Evaluation of newly synthesized compounds' hydrogen storage capabilities has dominated studies on hydrogen storage applications. For the first time, density functional theory (DFT) calculations have been run to study the unique characteristics and hydrogen storage capabilities of the YTi3H8 (Y = Na, K, and Rb) compounds. The lattice constants for the compounds being studied are 4.85 Å for RbTi3H8, 4.74 Å for KTi3H8, and 4.54 Å for NaTi3H8 when optimized in the cubic phase. These hydrides have negative formation enthalpy, which means they are thermodynamically stable. High gravimetric hydrogen storage densities of 4.62 % for NaTi3H8, 4.23 % for KTi3H8, and 3.40 % for RbTi3H8 make YTi3H8 (Y = Na, K, and Rb) a promising candidate for hydrogen storage. In addition, the electronic properties of these compounds lend credence to their metallic properties. Furthermore, these compounds satisfy the Born stability conditions as shown by examination of the mechanical properties obtained from elastic constants, such as Pugh's ratio and Young's modulus. While both NaTi3H8 and KTi3H8 hydrides are brittle, Pugh's ratio and Cauchy pressure show that KTi3H8 hydride is ductile. The mechanical stability, high hydrogen storage capacity, and metallic nature of YTi3H8 (Y = Na, K, and Rb) indicate that they might be used in solid-state hydrogen storage devices. Fuel cell technologies, hydrogen-powered cars, and stationary energy storage applications can benefit from their stability and high hydrogen content, making them potential candidates for sustainable hydrogen energy solutions.
{"title":"Computational screening of Ti-Based YTi3H8 (Y = Na, K and Rb) hydrides for efficient solid-state hydrogen storage system","authors":"Bilal Ahmed , Muhammad Bilal Tahir , Muhammad Sagir , N. Dhahri","doi":"10.1016/j.physleta.2025.130345","DOIUrl":"10.1016/j.physleta.2025.130345","url":null,"abstract":"<div><div>There has been a lot of recent interest on hydrogen storage due to the fact that hydrogen may be utilized as an energy source. Evaluation of newly synthesized compounds' hydrogen storage capabilities has dominated studies on hydrogen storage applications. For the first time, density functional theory (DFT) calculations have been run to study the unique characteristics and hydrogen storage capabilities of the YTi<sub>3</sub>H<sub>8</sub> (<em>Y</em> = Na, K, and Rb) compounds. The lattice constants for the compounds being studied are 4.85 Å for RbTi<sub>3</sub>H<sub>8</sub>, 4.74 Å for KTi<sub>3</sub>H<sub>8</sub>, and 4.54 Å for NaTi<sub>3</sub>H<sub>8</sub> when optimized in the cubic phase. These hydrides have negative formation enthalpy, which means they are thermodynamically stable. High gravimetric hydrogen storage densities of 4.62 % for NaTi<sub>3</sub>H<sub>8</sub>, 4.23 % for KTi<sub>3</sub>H<sub>8</sub>, and 3.40 % for RbTi<sub>3</sub>H<sub>8</sub> make YTi<sub>3</sub>H<sub>8</sub> (<em>Y</em> = Na, K, and Rb) a promising candidate for hydrogen storage. In addition, the electronic properties of these compounds lend credence to their metallic properties. Furthermore, these compounds satisfy the Born stability conditions as shown by examination of the mechanical properties obtained from elastic constants, such as Pugh's ratio and Young's modulus. While both NaTi<sub>3</sub>H<sub>8</sub> and KTi<sub>3</sub>H<sub>8</sub> hydrides are brittle, Pugh's ratio and Cauchy pressure show that KTi<sub>3</sub>H<sub>8</sub> hydride is ductile. The mechanical stability, high hydrogen storage capacity, and metallic nature of YTi<sub>3</sub>H<sub>8</sub> (<em>Y</em> = Na, K, and Rb) indicate that they might be used in solid-state hydrogen storage devices. Fuel cell technologies, hydrogen-powered cars, and stationary energy storage applications can benefit from their stability and high hydrogen content, making them potential candidates for sustainable hydrogen energy solutions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"538 ","pages":"Article 130345"},"PeriodicalIF":2.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420428","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}
Pub Date : 2025-02-09DOI: 10.1016/j.physleta.2025.130346
Haopeng Zhang , Xin Li , Hongxu Wang , Sushuang Shi , Jianqiang Li , Hongzhi Luo
Rietveld refinement of Heusler alloys Mn2NiGa1-xCux (x = 0.1, 0.3 and 0.5) XRD patterns confirms that doping element Cu occupies both A and D site simultaneously. And a higher percentage of Cu tends to occupy the D site with increasing Cu content. To investigate the influence of Cu occupation on martensitic transformation and magnetism, first-principles calculations on Mn2NiGa0.5Cu0.5 with different Cu occupation between A, D sites were performed. In Mn2NiGa0.5Cu0.5 austenite, with more Cu occupying D site, the phase stability increases and equilibrium lattice constant decreases. Cu entering the D site can enhance antiferromagnetic coupling between Mn (B) and Mn (A) spin moment, which leads to a rapid decrease of total moment of the austenite. The martensite-austenite energy difference ΔEM shows an increasing tendency with more Cu occupying the D site, which helps to improve the martensitic transformation temperature and can be explained by the electronic structure calculations.
{"title":"Site preference of Cu and its influence on martensitic transformation and magnetic properties of Heusler alloy Mn2NiGa0.5Cu0.5","authors":"Haopeng Zhang , Xin Li , Hongxu Wang , Sushuang Shi , Jianqiang Li , Hongzhi Luo","doi":"10.1016/j.physleta.2025.130346","DOIUrl":"10.1016/j.physleta.2025.130346","url":null,"abstract":"<div><div>Rietveld refinement of Heusler alloys Mn<sub>2</sub>NiGa<sub>1-x</sub>Cu<sub>x</sub> (<em>x</em> = 0.1, 0.3 and 0.5) XRD patterns confirms that doping element Cu occupies both A and D site simultaneously. And a higher percentage of Cu tends to occupy the D site with increasing Cu content. To investigate the influence of Cu occupation on martensitic transformation and magnetism, first-principles calculations on Mn<sub>2</sub>NiGa<sub>0.5</sub>Cu<sub>0.5</sub> with different Cu occupation between A, D sites were performed. In Mn<sub>2</sub>NiGa<sub>0.5</sub>Cu<sub>0.5</sub> austenite, with more Cu occupying D site, the phase stability increases and equilibrium lattice constant decreases. Cu entering the D site can enhance antiferromagnetic coupling between Mn (B) and Mn (A) spin moment, which leads to a rapid decrease of total moment of the austenite. The martensite-austenite energy difference ΔE<sub>M</sub> shows an increasing tendency with more Cu occupying the D site, which helps to improve the martensitic transformation temperature and can be explained by the electronic structure calculations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"537 ","pages":"Article 130346"},"PeriodicalIF":2.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402815","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}
Pub Date : 2025-02-08DOI: 10.1016/j.physleta.2025.130339
S.E. Savotchenko
New nonlinear interface waves corresponding to two different cases of a change in the nonlinearity signs are described analytically. The waves propagate along the planar interface between nonlinear and spatially gradient crystals with a hyperbolic profile of the dielectric constant. The combination of the refractive index gradient and nonlinearity allows us to obtain new dispersion properties of the waveguide structure. New exact analytical solutions describing the light nonlinear wave intensity distribution in the transverse direction to the interface is found. The influence of the optical parameters on the patterns of the light localization is described. New effects are found when changing the signs of nonlinearity to the opposite ones. The power flow carried by the interface wave is analytically calculated and analyzed. It is shown that varying the optical parameters allows controlling the distribution of energy flow density between the layers of the crystalline system.
{"title":"Light localization near the interface between two crystals with sign-change nonlinearity and the index gradient","authors":"S.E. Savotchenko","doi":"10.1016/j.physleta.2025.130339","DOIUrl":"10.1016/j.physleta.2025.130339","url":null,"abstract":"<div><div>New nonlinear interface waves corresponding to two different cases of a change in the nonlinearity signs are described analytically. The waves propagate along the planar interface between nonlinear and spatially gradient crystals with a hyperbolic profile of the dielectric constant. The combination of the refractive index gradient and nonlinearity allows us to obtain new dispersion properties of the waveguide structure. New exact analytical solutions describing the light nonlinear wave intensity distribution in the transverse direction to the interface is found. The influence of the optical parameters on the patterns of the light localization is described. New effects are found when changing the signs of nonlinearity to the opposite ones. The power flow carried by the interface wave is analytically calculated and analyzed. It is shown that varying the optical parameters allows controlling the distribution of energy flow density between the layers of the crystalline system.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"538 ","pages":"Article 130339"},"PeriodicalIF":2.3,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420455","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}
Pub Date : 2025-02-08DOI: 10.1016/j.physleta.2025.130340
Maryam Heidary, Peiman Amiri
Our investigation focuses on the optical and thermodynamic characteristics of YLaX (X = C, N, and B) compounds. The Quantum-ESPRESSO/PWSCF code, based on density functional theory and pseudopotential approach is used to carry out the calculations. The metallic and Drude-like behavior of the investigated compounds is indicated by significant negative values of ε1(ω). The compounds YLaC, YLaN, and YLaB exhibit plasmon peaks in the x-direction within the GGA approximation for incoming photon energies of 13.34, 15.57, and 13.52 eV. Notably, YLaN has the greatest plasmon peak in both x and z-directions within GGA and HSE06 approximations. In the ultraviolet region of the electromagnetic spectrum, the incident light has its highest reflectance and absorption coefficient under the HSE approximation. This feature makes the studied monolayers suitable for use in optoelectronic devices. MXenes have a higher absorbance than YLaB MBene, according to the absorption spectrum. The GGA+HSE06 approximation lowers the absorption as compared to GGA and facilitates easier electromagnetic wave propagation in matter. The endothermic nature of YLaC, YLaN, and YLaB monolayers is attributed to the rising trend of entropy as the temperature increases. Because YLaN has a higher Debye temperature, it has the smallest lattice constant and the highest stiffness at infinitesimal temperatures.
{"title":"Comparing the optical and thermodynamic properties of 2D YLaX (X= C, N) MXenes to YLaB MBene: Ab-initio study","authors":"Maryam Heidary, Peiman Amiri","doi":"10.1016/j.physleta.2025.130340","DOIUrl":"10.1016/j.physleta.2025.130340","url":null,"abstract":"<div><div>Our investigation focuses on the optical and thermodynamic characteristics of YLaX (X = C, N, and B) compounds. The Quantum-ESPRESSO/PWSCF code, based on density functional theory and pseudopotential approach is used to carry out the calculations. The metallic and Drude-like behavior of the investigated compounds is indicated by significant negative values of ε<sub>1</sub>(ω). The compounds YLaC, YLaN, and YLaB exhibit plasmon peaks in the x-direction within the GGA approximation for incoming photon energies of 13.34, 15.57, and 13.52 eV. Notably, YLaN has the greatest plasmon peak in both x and z-directions within GGA and HSE06 approximations. In the ultraviolet region of the electromagnetic spectrum, the incident light has its highest reflectance and absorption coefficient under the HSE approximation. This feature makes the studied monolayers suitable for use in optoelectronic devices. MXenes have a higher absorbance than YLaB MBene, according to the absorption spectrum. The GGA+HSE06 approximation lowers the absorption as compared to GGA and facilitates easier electromagnetic wave propagation in matter. The endothermic nature of YLaC, YLaN, and YLaB monolayers is attributed to the rising trend of entropy as the temperature increases. Because YLaN has a higher Debye temperature, it has the smallest lattice constant and the highest stiffness at infinitesimal temperatures.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"537 ","pages":"Article 130340"},"PeriodicalIF":2.3,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402814","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}
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