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Dynamic multicritical phase diagrams of the mixed spin (2, 5/2) Blume-Emery-Griffiths model with repulsive biquadratic coupling 具有排斥双二次耦合的混合自旋(2,5/2)Blume-Emery-Griffiths模型的动态多临界相图
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2731
M. Gençaslan, M. Keskin
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引用次数: 0
The fine spectral tuning of plasmon mode and quantum emitter coupling and itscomparison with the dark-hot resonances 等离子体模式和量子发射极耦合的精细光谱调谐及其与暗热共振的比较
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2692
H. Asif, R. Ovali, Ramazan Sahin
: Localization of incident fields into very small volumes (hot-spots) allows strong light-matter inter-actions at the hot spots. This makes path interference effects, Fano resonances, visible. Fano resonances can appear due to the coupling of a bright plasmon (i) to a longer lifetime dark plasmon mode or (ii) to a quantum object (QO) of a much longer lifetime. The second phenomenon provides a very important utility: the voltage tunability of the linear/nonlinear response. The level-spacing of the QO, such as defect-centers and quantum dots, are voltage-tunable which can make a sharp Fano resonance appear and disappear. Here, we compare the two phenomena by solving the equations of motions for the near-field plasmon amplitudes, derived from two different Hamiltonians. While the two plasmon amplitudes look similar to each other, except for the population inversion parameter ‘ y ’, our results show that quantum emitter enables fine spectral tuning of the plasmon amplitude, thus, providing better enhancement.
:将入射场定位为非常小的体积(热点),可以在热点处进行强光物质相互作用。这使得路径干涉效应,法诺共振,可见。Fano共振可能是由于明亮等离子体激元(i)与寿命更长的暗等离子体激元模式或(ii)与寿命长得多的量子物体(QO)的耦合而出现的。第二种现象提供了一个非常重要的效用:线性/非线性响应的电压可调谐性。QO的能级间距,如缺陷中心和量子点,是电压可调的,这可以使尖锐的Fano共振出现和消失。在这里,我们通过求解由两个不同的哈密顿量导出的近场等离子体振幅的运动方程来比较这两种现象。虽然除了布居反转参数“y”外,两个等离子体振幅看起来彼此相似,但我们的结果表明,量子发射器能够对等离子体振幅进行精细的光谱调谐,从而提供更好的增强。
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引用次数: 1
Dissolution of Alumina in Cryolite Melts: A Conceptual DFT Study 氧化铝在冰晶石熔体中的溶解:概念DFT研究
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2729
A. S. Özen, Z. Akdeniz
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引用次数: 0
Critical dynamics in biological Boolean networks follows from symmetric response to input genes 生物布尔网络的临界动力学遵循对输入基因的对称响应
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2727
Hamza Coban, A. Kabakçıoğlu
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引用次数: 0
3D self-assemble formation of molybdenum disulfide (MoS2)-doped polyacrylamide (PAAm) composite hydrogels 二硫化钼(MoS2)掺杂聚丙烯酰胺(PAAm)复合水凝胶的三维自组装形成
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2730
Sümeyye Durmaz, Ekrem Yildiz, B. Uysal, Mehmet Önder Pekcan
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引用次数: 0
The effect of interfacial morphology on the magnetic and magnetocaloricproperties of ferromagnetic nanoparticles with core-shell geometry: a MonteCarlo Study 界面形态对核壳结构铁磁性纳米颗粒磁热性能的影响:MonteCarlo研究
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2689
Y. Yüksel
Within the framework of Monte Carlo simulations, we investigate the magnetic and magnetocaloric properties of a nanocomposite particle composed of ferromagnetic core and shell layers. We found that isothermal magnetic entropy change may exhibit two peaks associated to two different phase transitions of the core and shell layers. We paid particular attention to the microscopic details of the core/shell interface. Our results suggest that for the large values of the interface exchange coupling, the full width at half maximum is expanded at the expense of the low temperature peak of isothermal entropy change |∆SM | whereas the high temperature peak is found to be more or less insensitive to varying exchange coupling. Besides, our simulations yield that magnetocaloric properties of the particles with a cubic core are enhanced in comparison with those composed of truncated cuboctahedral, spherical, octahedral, and asteroid shaped cores.
在蒙特卡罗模拟的框架内,我们研究了由铁磁核和壳层组成的纳米复合粒子的磁性和磁热特性。我们发现等温磁熵变化可能出现两个峰,与核和壳层的两种不同相变有关。我们特别注意了核/壳界面的微观细节。研究结果表明,当界面交换耦合值较大时,等温熵变|∆SM |的低温峰在半最大值时的全宽度得到了扩展,而高温峰对交换耦合的变化基本不敏感。此外,我们的模拟结果表明,与由截断的立方体、球形、八面体和小行星形状的核组成的粒子相比,立方核粒子的磁热学性能得到了增强。
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引用次数: 1
Self-consistent Markovian embedding of generalized Langevin equations with configuration-dependent mass and a nonlinear friction kernel 具有配置相关质量和非线性摩擦核的广义Langevin方程的自洽Markovian嵌入
IF 2.1 Q3 Physics and Astronomy Pub Date : 2022-01-01 DOI: 10.55730/1300-0101.2726
Cihan Ayaz, L. Tepper, R. Netz
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引用次数: 0
Scattering of kinks in noncanonical sine-Gordon Model 非正则sine-Gordon模型中扭结的散射
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-11-01 DOI: 10.3906/fiz-2201-1
I. Takyi, B. Barnes, H. M. Tornyeviadzi, J. Ackora-Prah
In this paper, we numerically study the scattering of kinks in the noncanonical sine-Gordon model using Fourier spectral methods. The model depends on two free parameters, which control the localized inner structure in the energy density and the characteristics of the scattering potential. It has been conjectured that the kink solutions in the noncanonical model possess inner structures in their energy density, and the presence of these yields bound states and resonance structures for some relative velocities between the kink and the antikink. In the numerical study, we observed that the classical kink mass decreases monotonically as the free parameters vary, and yields bion-formations and long-lived oscillations in the scattering of the kink-antikink system.
在本文中,我们使用傅立叶谱方法对非正则正弦Gordon模型中扭结的散射进行了数值研究。该模型依赖于两个自由参数,这两个参数控制能量密度中的局部内部结构和散射势的特性。据推测,非经典模型中的扭结解在其能量密度中具有内部结构,并且这些结构的存在产生了扭结和反扭结之间某些相对速度的束缚态和共振结构。在数值研究中,我们观察到经典扭结质量随着自由参数的变化而单调下降,并在扭结-反扭结系统的散射中产生仿生形成和长寿命振荡。
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引用次数: 1
Deriving Weak Deflection Angle by Black Holes or Wormholes using Gauss-Bonnet Theorem 利用高斯-博内定理推导黑洞或虫洞的弱偏转角
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-10-26 DOI: 10.3906/fiz-2110-16
Yashmitha Kumaran, A. Ovgun
In this review, various researches on finding the bending angle of light deflected by a massive gravitating object which regard the Gauss-Bonnet theorem as the premise have been revised. Primarily, the Gibbons and Werner method is studied apropos of the gravitational lensing phenomenon in the weak field limits. Some exclusive instances are deliberated while calculating the deflection angle, beginning with the finite-distance corrections on non-asymptotically flat spacetimes. Effects of plasma medium is then inspected to observe its contribution to the deflection angle. Finally, the Jacobi metric is explored as an alternative method, only to arrive at similar results. All of the cases are probed in three constructs, one as a generic statement of explanation, one for black holes, and one for wormholes, so as to gain a perspective on every kind of influence.
本文对以高斯-邦尼特定理为前提的关于求大质量引力物体偏转光的弯曲角的各种研究进行了修正。本文首先研究了弱场极限下的引力透镜现象的Gibbons和Werner方法。在计算偏转角时,从非渐近平坦时空上的有限距离修正开始,考虑了一些特例。然后考察等离子体介质的影响,观察其对偏转角的贡献。最后,将雅可比度量作为一种替代方法进行了探索,结果也很相似。所有的情况都在三种结构中进行探讨,一种是作为解释的一般陈述,一种是关于黑洞的,一种是关于虫洞的,以便对每一种影响都有一个视角。
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引用次数: 9
Defect studies in strain-relaxed Si$_{1-x}$Ge$_{x}$ alloys 应变松弛Si$ {1-x}$Ge$ {x}$合金的缺陷研究
IF 2.1 Q3 Physics and Astronomy Pub Date : 2021-10-08 DOI: 10.3906/fiz-1212-1
S. Kalem
Raman light scattering, low-temperature photoluminescence, light-scattering tomography, and hydrogenation were used to investigate optical properties of defects in strain-relaxed Si_{1-x}Ge_x (0.05 le x le 0.50) alloys. The photoluminescence emission was characterized by typical zero-phonon, phonon-assisted, and dislocations-related emissions, which are dependent on Ge composition x. However, luminescence spectra exhibited above band-gap features, which are likely associated with the presence of Si-rich regions in the alloys. The results are correlated with light-scattering tomography, revealing the presence of dislocations and Si precipitates. The excess peak at 519 cm^{-1} in Ge-rich samples is supportive of this observation. At low Ge content, a dislocation-related band (D2 line) at 14,204 {AA} dominates D-band emission for x<0.25 while overall D-band emission intensity decreases with x. Hydrogenation was found to enhance D-band emission, indicating a passivation of nonradiative recombination centers inside dislocation cores. Si-Si, Si-Ge, and Ge-Ge phonons (TO, TA, and LA), which are participating in luminescence emission, evolve with increasing Ge content and Ge-Ge and Si-Ge TO lines dominate the Raman spectrum to the detriment of the Si-Si TO phonon line. Raman spectra reveal the presence of alloy fluctuations and possible presence of Ge particles, particularly in Ge-rich samples.
采用拉曼光散射、低温光致发光、光散射层析成像和氢化等方法研究了应变弛豫硅中缺陷的光学性质_{1-x}Ge_x(0.05le xle 0.50)合金。光致发光发射的特征是典型的零声子、声子辅助和位错相关发射,这取决于Ge成分x。然而,发光光谱表现出以上带隙特征,这可能与合金中富硅区域的存在有关。结果与光散射层析成像相关联,揭示了位错和Si沉淀的存在。富锗样品中519厘米处的过量峰支持了这一观察结果。在低Ge含量下,14204{AA}处的位错相关带(D2线)在x<0.25的情况下主导D带发射,而总体D带发射强度随着x而降低。发现氢化增强了D带辐射,表明位错核内的非辐射复合中心钝化。参与发光发射的Si-Si、Si-Ge和Ge-Ge声子(TO、TA和LA)随着Ge含量的增加而演化,并且Ge-Ge和Si-Ge TO线主导拉曼光谱,损害了Si-Si-TO声子线。拉曼光谱揭示了合金波动的存在和Ge颗粒的可能存在,特别是在富含Ge的样品中。
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引用次数: 0
期刊
Turkish Journal of Physics
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