物理最新文献

{"title":"Second-order electrogyration effect in BSO crystal","authors":"María Alejandra Guerrero-V,&nbsp;Jorge-Enrique Rueda-P","doi":"10.1007/s00340-024-08327-5","DOIUrl":"10.1007/s00340-024-08327-5","url":null,"abstract":"<div><p>Using a non-holographic optical setup, we employed a Mueller–Stokes polarimeter to measure both the linear electro-optic and second-order electrogyration effects. The second-order electrogyration effect was observed in a <span>(Bi_{12}SiO_{20})</span> (BSO) crystal with a (110) cut. This response was found for the electric field applied both parallel and perpendicular to the [001] direction, where the values for the second-order electrogyration are <span>(4.86times 10^{7} , text {pm}^{2}/text {V}^{2})</span> and <span>(1.87times 10^{7} , text {pm}^{2}/text {V}^{2})</span>, respectively. Additionally, the linear electro-optic coefficient <span>(gamma _{41})</span> was measured to be <span>(1.17 , text {pm/V})</span> for <span>(660.5 , text {nm})</span>.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-024-08327-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451060","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":"Spectroscopic investigation of Pr3+ doped ZnS nanoparticle in silica glass matrix prepared by sol–gel method","authors":"Lalruat Puia,&nbsp;K. M. S. Dawngliana,&nbsp;S. Rai","doi":"10.1007/s00339-024-07963-0","DOIUrl":"10.1007/s00339-024-07963-0","url":null,"abstract":"<div><p>In present work we report the structural and optical behaviour of (99-x) SiO₂ + 1ZnS + xPr (NO₃)₃·6H₂O glass system where Pr (NO₃)₃·6H₂O ions is doped in different molar concentrations (x = 1.0, 3.0 and 5.0 mol %) have been prepared by sol–gel method. X-ray diffraction (XRD) spectra confirmed that the formation of glassy amorphous nature. FTIR spectra results confirmed the incorporation of the dopants into the ZnS lattice structure. The average particle size calculated from Transmission electron microscopy (TEM) spectra is around 10 nm and Selective area electron diffraction (SAED) image confirmed that studied glass is polycrystalline in nature. Judd–Ofelt (JO) intensity parameters (Ω₂, Ω₄ and Ω₆) have been evaluated from the emission spectrum. The radiative parameters such as radiative transition probability (A_R), branching ratio (β_R), stimulated emission cross-section (σ_se) and radiative lifetimes (τ_R) were obtained using the JO parameters. According to the CIE chromaticity, this glass can produce green light and be helpful for laser applications in the visible spectrum. It may be used as optical amplifier devices as indicated by the values of the Figure of Merit (FOM).</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the influence of ionization on high-harmonic generation in Ar–Ne and Ar–Kr gas mixtures driven by kHz laser pulses","authors":"S. Chintalwad,&nbsp;B. Ramakrishna,&nbsp;Lap Van Dao","doi":"10.1140/epjd/s10053-024-00924-5","DOIUrl":"10.1140/epjd/s10053-024-00924-5","url":null,"abstract":"<div><p>We conducted a study on high-harmonic generation (HHG) in mixed gases, specifically Ar–Ne or Ar–Kr, with the aim of investigating the impact of ionization rate and neutral dispersion on the HHG process. Our focus was on understanding how these factors influence the HHG process when using gases with low and high ionization potentials. Based on phase-matched high-order harmonic generation in pure Ar gas, our investigation shows that the influence of plasma dispersion and neutral dispersion can be varied independently in mixed gas while the laser intensity is kept constant. Our results reveal that the addition of low ionization potential gases, such as Kr, to the Ar gas leads to a more rapid reduction in phase matching, due to the strong effects of ionization. The observed experimental outcomes align well with our theoretical calculations. This study provides valuable insights into the interplay of ionization rate and neutral dispersion in high-harmonic generation and the special requirement of the controlling of laser intensity for phase-matched harmonic generation. The findings contribute to a deeper understanding of the underlying dynamics and offer practical considerations for optimizing HHG properties.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Above-threshold ionization by a strong circularly polarized laser pulse assisted by a terahertz pulse","authors":"D. Agačević,&nbsp;N. Ibrišimović,&nbsp;D. Škrgić,&nbsp;D. B. Milošević","doi":"10.1140/epjd/s10053-024-00920-9","DOIUrl":"10.1140/epjd/s10053-024-00920-9","url":null,"abstract":"<p>We investigate how the above-threshold ionization by an intense circularly polarized infrared laser pulse is modified in the presence of a strong circularly polarized terahertz pulse. It is shown that both the differential ionization probability and the maximum photoelectron kinetic energy can be increased or decreased by an order of magnitude by changing the time delay between the laser and terahertz pulses. The results obtained by numerical integration agree well with those obtained using the modified saddle-point method. The used laser and terahertz pulse parameters are readily available at the modern experimental facilities.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Structure, maximum mass, and stability of compact stars in (f(mathcal {Q,T})) gravity","authors":"G. G. L. Nashed,&nbsp;Tiberiu Harko","doi":"10.1140/epjc/s10052-024-13436-8","DOIUrl":"10.1140/epjc/s10052-024-13436-8","url":null,"abstract":"<div><p>We investigate the properties of compact objects in the <i>f</i>(<i>Q</i>, <i>T</i>) theory, where <span>(mathcal {Q})</span> is the non-metricity scalar and <span>({ mathcal {T}})</span> is the trace of the energy–momentum tensor. We derive an interior analytical solution for anisotropic perfect-fluid spheres in hydrostatic equilibrium using the linear form of <span>(f(mathcal {Q}, { mathcal {T}})=mathcal {Q}+psi { mathcal {T}})</span>, where <span>(psi )</span> represents a dimensional parameter. Based on the observational constraints related to the mass and radius of the pulsar SAX J1748.9-2021, <span>(psi )</span> is set to a maximum negative value of <span>(psi _1=psi / kappa ^2=-0.04)</span>, where <span>(kappa ^2)</span> is the gravitational coupling constant. The solution results in a stable compact object, which does not violate the speed of sound condition <span>(c_s^2le frac{c^2}{3})</span>. The effective equation of state is similar to the quark matter equation of state, and involves the presence of an effective bag constant. When <span>(psi )</span> is negative, the star has a slightly larger size as compared to GR stars with the same mass. The difference in the predicted star size between the theory with a negative <span>(psi )</span> and GR for the same mass is attributed to an additional force appearing in the hydrodynamic equilibrium equation. The maximum compactness allowed by the strong energy condition for <span>(f(mathcal {Q}, { mathcal {T}}))</span> theory and for GR is <span>(C = 0.514)</span> and 0.419, respectively, with the <span>(f(mathcal {Q}, { mathcal {T}}))</span> prediction about <span>(10%)</span> higher than the GR one. Assuming a surface density at saturation nuclear density of <span>(rho _{text {nuc}} = 4times 10^{14}~hbox {g}/hbox {cm}^3)</span>, the maximum mass of the star is <span>(4.66 M_odot )</span>, with a radius of 14.9 km.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13436-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Heavy neutrino as dark matter in a neutrinophilic U(1) model","authors":"Waleed Abdallah,&nbsp;Anjan Kumar Barik,&nbsp;Santosh Kumar Rai,&nbsp;Tousik Samui","doi":"10.1140/epjc/s10052-024-13407-z","DOIUrl":"10.1140/epjc/s10052-024-13407-z","url":null,"abstract":"<div><p>We study the prospect of heavy singlet neutrinos as a dark matter (DM) candidate within a neutrinophilic <i>U</i>(1) model, where the Standard Model (SM) is extended with a <i>U</i>(1) gauge symmetry, and neutrino mass and oscillation parameters are explained through an inverse see-saw mechanism. The lightest of the heavy neutrinos plays the role of the DM, while the newly introduced scalars and the extra gauge boson <span>(Z')</span> act as mediators between the dark sector and the SM sector. We show the range of model parameters where this DM candidate can be accommodated in the Weakly Interacting Massive Particle (WIMP) or Feebly Interacting Massive Particle (FIMP) scenario. The observed DM relic density (DMRD) is achieved via the new gauge boson and singlet scalar portals in the WIMP scenario, whereas within the FIMP scenario, these two particles assume a distinct yet pivotal role in generating the observed DMRD.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13407-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Polyvector deformations of Type IIB backgrounds","authors":"Kirill Gubarev,&nbsp;Edvard T. Musaev,&nbsp;Timophey Petrov","doi":"10.1140/epjc/s10052-024-13402-4","DOIUrl":"10.1140/epjc/s10052-024-13402-4","url":null,"abstract":"<div><p>We develop a formalism of poly-vector deformations for Type IIB backgrounds with a block diagonal metric and non-vanishing self-dual 5-form RR field strength. Making use of the embedding of the Type IIB theory into the <span>(textrm{E}_{6(6)})</span> exceptional field theory we derive explicit transformation rules for four-vector deformations. We prove that the algebraic condition following from the Type IIB realization of exceptional Drinfeld algebras is sufficient for the transformation to generate a solution.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13402-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Correction to: Design of convex-shaped transparent heat spreaders for symmetrical cooling of a thin-disk laser crystal by mechanical pressing","authors":"Jan-Hinnerk Wolter,&nbsp;Andreas Voss,&nbsp;Thomas Graf,&nbsp;Marwan Abdou Ahmed","doi":"10.1007/s00340-024-08340-8","DOIUrl":"10.1007/s00340-024-08340-8","url":null,"abstract":"","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-024-08340-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451056","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":"Optimizing laser surface texturing effect via synergy of Burst-mode and advanced scanning paths","authors":"Yangdong Huang,&nbsp;Haoyang Ni,&nbsp;Xingsheng Wang","doi":"10.1007/s00340-024-08337-3","DOIUrl":"10.1007/s00340-024-08337-3","url":null,"abstract":"<div><p>Different laser surface texturing (LST) parameters produce varying effects, prompting the need to rationalize a strategy that optimizes structure for specific functionalities while maintaining manufacturing efficiency. This study applied square groove texturing to 304 stainless steel samples using a combination of scanning paths and Burst-mode to explore strategies that enhance texturing effect. In this paper, the texturing effect is quantified by texturing efficiency and surface quality. The square groove textures were manufactured using four scanning paths under picosecond lasers: 90°, 60°, circular, and horizontal-vertical reciprocating (HVR), along with Burst-mode at various pulses per burst (PPB). Multifactorial experiment systematically analyzed the texturing effect of various combination strategies. Additionally, this study established a geometric simulation model to validate the experimental results’ accuracy. Comparative analysis demonstrated that the simulation model effectively reflects the actual texturing results. The results indicated that this strategy achieves better texturing effect compared to traditional methods. Specifically, with the pulse number fixed at 2, the texturing efficiency of the horizontal-vertical reciprocating (HVR) scanning path is nearly twice that of the 60° scanning path, while also maintaining superior surface quality.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447396","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":"Effect of co-doping of Na+ and Bi3+ ions on magnetotransport and thermopower studies of La0.67Sr0.33MnO3 manganite","authors":"Kama Ramya,&nbsp;S. Bharadwaj,&nbsp;Someshwar Pola,&nbsp;Gunadhor Singh Okram,&nbsp;Y. Kalyanalakshmi","doi":"10.1007/s00339-024-07957-y","DOIUrl":"10.1007/s00339-024-07957-y","url":null,"abstract":"<div><p>The current work discusses on the effect of sodium (Na) and bismuth (Bi) ion doping at different concentrations in the compositional formula La_0.67Sr_0.33–yNa_y/2Bi_y/2MnO₃ (y = 0, 0.0825, 0.165, 0.2475, 0.33) on structural, magnetic, magnetotransport and thermoelectric studies. X-ray diffraction confirms the R<span>(:stackrel{-}{3})</span>c space group with rhombohedral structure and the field emission scanning electron microscope images confirms a systematic growth of grains with increasing in NaBi concentrations. An enhancement in the ferromagnetic ordering and magnetic transitions above 325 K were observed up to y = 0.165 and they decrease thereafter. A broad maximum along with a double peak behavior were noticed in the temperature dependent resistivity curves and they disappear upon the application of external magnetic fields. The Seebeck coefficient show a change of sign from positive to negative with increasing temperature for lower concentrations of NaBi and they exhibit a negative sign for higher substitutions suggesting the variation in the nature of charge carriers. The small polaron hopping mechanism governs the resistivity and thermopower behavior in the high temperature regions while, electron-electron, electron-magnon, magnon-magnon scattering mechanism contributes in the low temperature region.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}