Muhammad Rizwan, Muhammad Moin, Hafiz Muhammad Naeem Ullah, Abdul Waheed Anwar, Uzma Mushtaq, Tariq Mahmood
In this study, we used density functional theory to examine how the wide band gap optoelectronic properties of pure, silver-, and cadmium-doped LaAlO 3 perovskites changed. Structural, electrical, elastic, and mechanical properties were calculated using generalized gradient approximation. Silver and cadmium incorporated at Al site demonstrated a decreasing trend in the band gap. Both impurities showed the reduction in band gap from 2.98 to 0.468 eV and from 2.98 to 2.0238 eV. The density of states was examined for pristine and doped structures to understand behavioral change of LaAlO 3 . It was observed that p states in upper valance band and d states in lower conduction band were contributing toward the reduction of band gap. Elastic properties were computed. Elastic parameters were used to calculate Born’s stability and it is predicted that the material is stable mechanically for both pristine and doped forms. Mechanical properties were also predicted and brittle nature was found for both pristine and doped materials. Optical responses such as dielectric function, absorption, and refractive index were also predicted. The impurity inclusion in pristine structure not only reduces the bad gap but also alters the optical behavior. Absorption edge shifted toward lower energy shows a clear redshift, whereas refractive index also reduces from 2.4 to 1.9, making the material more transparent. The absorption spectrum as well as electronic band gap makes this material more useful for solar cell application as well as photocatalytic applications.
{"title":"Investigations of electronic, elastic, and optical properties of (Ag, Cd)-doped LaAlO<sub>3</sub>: a computational insight","authors":"Muhammad Rizwan, Muhammad Moin, Hafiz Muhammad Naeem Ullah, Abdul Waheed Anwar, Uzma Mushtaq, Tariq Mahmood","doi":"10.1139/cjp-2023-0040","DOIUrl":"https://doi.org/10.1139/cjp-2023-0040","url":null,"abstract":"In this study, we used density functional theory to examine how the wide band gap optoelectronic properties of pure, silver-, and cadmium-doped LaAlO 3 perovskites changed. Structural, electrical, elastic, and mechanical properties were calculated using generalized gradient approximation. Silver and cadmium incorporated at Al site demonstrated a decreasing trend in the band gap. Both impurities showed the reduction in band gap from 2.98 to 0.468 eV and from 2.98 to 2.0238 eV. The density of states was examined for pristine and doped structures to understand behavioral change of LaAlO 3 . It was observed that p states in upper valance band and d states in lower conduction band were contributing toward the reduction of band gap. Elastic properties were computed. Elastic parameters were used to calculate Born’s stability and it is predicted that the material is stable mechanically for both pristine and doped forms. Mechanical properties were also predicted and brittle nature was found for both pristine and doped materials. Optical responses such as dielectric function, absorption, and refractive index were also predicted. The impurity inclusion in pristine structure not only reduces the bad gap but also alters the optical behavior. Absorption edge shifted toward lower energy shows a clear redshift, whereas refractive index also reduces from 2.4 to 1.9, making the material more transparent. The absorption spectrum as well as electronic band gap makes this material more useful for solar cell application as well as photocatalytic applications.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135720219","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}
We present a simple model of a metal in a gravitational field in order to show some physical features that help in understanding how the metal holds itself up against gravity. The nuclei are held up against gravity by their bound electron(s) as well as the electric field due to all the gravitationally induced electric dipoles at other lattice sites; these dipoles result from the bound electrons sinking, in response to the gravitational field, by a smaller distance than the nuclei. We also consider the conduction electrons to be held up by Fermi pressure. We use the model to estimate the magnitude of the gravitationally induced electric field in a metal and to establish its direction. We work in the low temperature limit.
{"title":"Model of a Metal in a Gravitational Field","authors":"Mark R.A. Shegelski, Jerad Shaw, Mitchell Hawse","doi":"10.1139/cjp-2023-0183","DOIUrl":"https://doi.org/10.1139/cjp-2023-0183","url":null,"abstract":"We present a simple model of a metal in a gravitational field in order to show some physical features that help in understanding how the metal holds itself up against gravity. The nuclei are held up against gravity by their bound electron(s) as well as the electric field due to all the gravitationally induced electric dipoles at other lattice sites; these dipoles result from the bound electrons sinking, in response to the gravitational field, by a smaller distance than the nuclei. We also consider the conduction electrons to be held up by Fermi pressure. We use the model to estimate the magnitude of the gravitationally induced electric field in a metal and to establish its direction. We work in the low temperature limit.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769780","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}
We calculate the Big Bang nucleosynthesis abundances for helium-4 and deuterium for a range of neutron lifetimes, τ n = 840–1050 s, using the state-of-the-art Python package PRyMordial. We show the results for two different nuclear reaction rates, calculated by NACRE II and the PRIMAT collaborations.
我们使用最先进的Python软件包PRyMordial计算了在中子寿命τ n = 840 - 1050s范围内氦-4和氘的大爆炸核合成丰度。我们展示了两种不同的核反应速率的结果，由NACRE II和PRIMAT合作计算。
{"title":"Neutron Lifetime Anomaly and Big Bang Nucleosynthesis","authors":"Tammi Chowdhury, Seyda Ipek","doi":"10.1139/cjp-2023-0188","DOIUrl":"https://doi.org/10.1139/cjp-2023-0188","url":null,"abstract":"We calculate the Big Bang nucleosynthesis abundances for helium-4 and deuterium for a range of neutron lifetimes, τ n = 840–1050 s, using the state-of-the-art Python package PRyMordial. We show the results for two different nuclear reaction rates, calculated by NACRE II and the PRIMAT collaborations.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136307058","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}
We analyze an isotropic uncharged fluid sphere model within bigravity considering the Durgapal IV metric [M.C. Durgapal, J. Phys. A 15 2637 (1982)]. In this work, we investigate the effects of the scale parameter k on the local matter distribution.
Here, we have chosen the compact star candidate SMC X-1 with observed values of mass =(1.29 ± 0.05)M⊙ and radius = 8.831_{-0.09}^{+0.09} km. respectively, to analyze our results analytically as well as graphically. For smaller values of k, we get the stiff (or hard) equation of state (EoS). Here we solve the modified Einstein's field equations in presence of the background metric gamma_{mu nu}. Due to this constant curvature background, the density and pressure terms are modified by adding an extra term, which affects the EoS. For r ll k, the background de Sitter space-time reduces into Minkowski form and the coupling vanishes. We discuss certain physical quantities of our obtained solution such as density, isotropic pressure, sound speed, pressure-density gradients, compactness, and surface redshift to claim the physical viability of our model.
It is found that our model clearly satisfies all the energy conditions, the causality condition, and the dynamical equilibrium via modified TOV equation. Finally, we can conclude that our proposed model is physically realistic and well-behaved.
{"title":"Isotropic Durgapal IV fluid sphere in bigravity","authors":"PRAMIT REJ","doi":"10.1139/cjp-2023-0205","DOIUrl":"https://doi.org/10.1139/cjp-2023-0205","url":null,"abstract":"We analyze an isotropic uncharged fluid sphere model within bigravity considering the Durgapal IV metric [M.C. Durgapal, J. Phys. A <b>15</b> 2637 (1982)]. In this work, we investigate the effects of the scale parameter k on the local matter distribution.
 Here, we have chosen the compact star candidate SMC X-1 with observed values of mass =(1.29 ± 0.05)M⊙ and radius = 8.831_{-0.09}^{+0.09} km. respectively, to analyze our results analytically as well as graphically. For smaller values of k, we get the stiff (or hard) equation of state (EoS). Here we solve the modified Einstein's field equations in presence of the background metric gamma_{mu nu}. Due to this constant curvature background, the density and pressure terms are modified by adding an extra term, which affects the EoS. For r ll k, the background de Sitter space-time reduces into Minkowski form and the coupling vanishes. We discuss certain physical quantities of our obtained solution such as density, isotropic pressure, sound speed, pressure-density gradients, compactness, and surface redshift to claim the physical viability of our model.
 It is found that our model clearly satisfies all the energy conditions, the causality condition, and the dynamical equilibrium via modified TOV equation. Finally, we can conclude that our proposed model is physically realistic and well-behaved.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136307909","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}
S. Surendra Singh, Leishingam Kumrah, Md Khurshid Alam, L. Kapil Singh, Lambamayum Anjana Devi
In this work, the authors examine the dynamics of viscous Universe in the Sáez–Ballester theory of gravity. The solutions of the Friedmann–Robertson–Walker field equations have been derived within the framework of full causal theories presented by Israel and Stewart using simple parametrization of scale factor a( t), i.e., power law relation a( t) = a 0 t α and exponential law a( t) = b 0 e β t . The power law cosmological model shows that the Universe transitioned from early cosmic deceleration to the present cosmic acceleration, and the exponential cosmological model shows the accelerated expansion of the Universe. It has been discovered that as time passes, energy density and viscosity decrease while temperature rises. Energy conditions are also investigated in which the strong energy condition is violated. The behaviour of the cosmological parameters such as the Hubble parameter, energy density, pressure, coefficient of viscosity, and state-finder parameter has been presented graphically.
在这项工作中，作者研究了Sáez-Ballester重力理论中粘性宇宙的动力学。在Israel和Stewart提出的全因果理论框架内，利用尺度因子a(t)的简单参数化，即幂律关系a(t) = a 0 t α和指数律a(t) = b 0 e β t，推导出了friedman - robertson - walker场方程的解。幂律宇宙学模型表明宇宙从早期的宇宙减速过渡到现在的宇宙加速，指数宇宙学模型表明宇宙的加速膨胀。人们发现，随着时间的推移，能量密度和粘度随着温度的升高而降低。还研究了违反强能条件的能量条件。宇宙学参数，如哈勃参数、能量密度、压力、粘度系数和状态探测参数的行为已经用图形表示出来。
{"title":"Causal Viscous Universe in Sáez-Ballester Theory","authors":"S. Surendra Singh, Leishingam Kumrah, Md Khurshid Alam, L. Kapil Singh, Lambamayum Anjana Devi","doi":"10.1139/cjp-2022-0342","DOIUrl":"https://doi.org/10.1139/cjp-2022-0342","url":null,"abstract":"In this work, the authors examine the dynamics of viscous Universe in the Sáez–Ballester theory of gravity. The solutions of the Friedmann–Robertson–Walker field equations have been derived within the framework of full causal theories presented by Israel and Stewart using simple parametrization of scale factor a( t), i.e., power law relation a( t) = a 0 t α and exponential law a( t) = b 0 e β t . The power law cosmological model shows that the Universe transitioned from early cosmic deceleration to the present cosmic acceleration, and the exponential cosmological model shows the accelerated expansion of the Universe. It has been discovered that as time passes, energy density and viscosity decrease while temperature rises. Energy conditions are also investigated in which the strong energy condition is violated. The behaviour of the cosmological parameters such as the Hubble parameter, energy density, pressure, coefficient of viscosity, and state-finder parameter has been presented graphically.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059621","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}
Many models have been proposed to minimize the dark matter (DM) content in various astronomical objects at every scale in the Universe. The most widely known model is MOdified Newtonian dynamics (MOND). MOND was first published by Mordehai Milgrom in 1983. A second concurrent model is modified gravity, which is a covariant scalar–tensor–vector extension of general relativity. Other theories also exist but have not been broadly applied to a large list of astronomical objects. Eventually, we can also mention the Newtonian fractional-dimension gravity, a gravity theory based on spaces with fractional (i.e., non-integer) dimension. A new model, called κ-model, based on very elementary phenomenological considerations, has recently been proposed in the astrophysics field. This model shows that the presence of DM can be considerably minimized with regard to the dynamics of galaxies. The κ-model belongs to the general family of theories descended from MOND. Under this family of theories, there is no need to develop a highly uncertain DM sector of physics to explain the observations.
{"title":"A comparative study of MOND and MOG theories versus 
 κ-model: An application to galaxy clusters","authors":"G. Pascoli","doi":"10.1139/cjp-2023-0159","DOIUrl":"https://doi.org/10.1139/cjp-2023-0159","url":null,"abstract":"Many models have been proposed to minimize the dark matter (DM) content in various astronomical objects at every scale in the Universe. The most widely known model is MOdified Newtonian dynamics (MOND). MOND was first published by Mordehai Milgrom in 1983. A second concurrent model is modified gravity, which is a covariant scalar–tensor–vector extension of general relativity. Other theories also exist but have not been broadly applied to a large list of astronomical objects. Eventually, we can also mention the Newtonian fractional-dimension gravity, a gravity theory based on spaces with fractional (i.e., non-integer) dimension. A new model, called κ-model, based on very elementary phenomenological considerations, has recently been proposed in the astrophysics field. This model shows that the presence of DM can be considerably minimized with regard to the dynamics of galaxies. The κ-model belongs to the general family of theories descended from MOND. Under this family of theories, there is no need to develop a highly uncertain DM sector of physics to explain the observations.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059618","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}
Alexander Kholmetskii, Oleg V. Missevitch, Tolga Yarman
We recall that a consistent description of the Thomas precession and Thomas–Wigner rotation is impossible without introducing a “tracking rule” into the structure of the special theory of relativity (STR), as we have shown in our publications (A.L. Kholmetskii and T. Yarman. Eur. Phys. J. Plus 132, 400 (2017); A.L. Kholmetskii, O.V. Missevitch, T. Yarman, and M. Arik. Europhys. Lett. 129, 3006 (2020)). The purely phenomenological origin of this rule in the framework of STR allows assuming the existence of a more general theory of empty space–time than STR, where the “tracking rule” is intrinsically incorporated into its structure. We find a possible way of developing such a generalized theory of empty space–time, where the “tracking rule” naturally arises, and propose an experimental scheme for its verification.
我们回顾一下，正如我们在我们的出版物(A.L. Kholmetskii和T. Yarman)中所表明的那样，如果不向狭义相对论(STR)的结构引入“跟踪规则”，就不可能对托马斯进动和托马斯-维格纳旋转进行一致的描述。欧元。理论物理。J. Plus 132,400 (2017);A.L. Kholmetskii, O.V. Missevitch, T. Yarman和M. Arik。Europhys。Lett. 129,3006(2020))。这条规则在STR框架中的纯粹现象学起源允许假设存在比STR更一般的空时空理论，其中“跟踪规则”本质上被纳入其结构。我们找到了一种可能的方法来发展这种“跟踪规则”自然产生的空时空广义理论，并提出了一个验证它的实验方案。
{"title":"“Tracking rule\" and generalization of special relativity","authors":"Alexander Kholmetskii, Oleg V. Missevitch, Tolga Yarman","doi":"10.1139/cjp-2023-0083","DOIUrl":"https://doi.org/10.1139/cjp-2023-0083","url":null,"abstract":"We recall that a consistent description of the Thomas precession and Thomas–Wigner rotation is impossible without introducing a “tracking rule” into the structure of the special theory of relativity (STR), as we have shown in our publications (A.L. Kholmetskii and T. Yarman. Eur. Phys. J. Plus 132, 400 (2017); A.L. Kholmetskii, O.V. Missevitch, T. Yarman, and M. Arik. Europhys. Lett. 129, 3006 (2020)). The purely phenomenological origin of this rule in the framework of STR allows assuming the existence of a more general theory of empty space–time than STR, where the “tracking rule” is intrinsically incorporated into its structure. We find a possible way of developing such a generalized theory of empty space–time, where the “tracking rule” naturally arises, and propose an experimental scheme for its verification.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059794","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}
Aim of this paper is to investigate an anisotropic locally rotationally symmetric (LRS) Bianchi type-I space–time in the context of the recently proposed f( Q, T) gravity, where Q is the non-metricity scalar and T is energy–momentum tensor. We have considered f( Q, T) = α Q + β T a linear form, where α and β are model parameters. We have analyzed the exact solution of LRS Bianchi type-I space–time by assuming relation between metric potential A = B n , where n is arbitrary non-zero real number. To study the anisotropic nature of the dynamical dark energy, we assume that the skewness parameters are time dependent and n ≠ 1. We have constrained to our model by using observational Hubble dataset. Onwards, discussed the physical behavior of cosmological parameters such as energy density, pressure, EoS parameter, deceleration parameter and, Energy conditions.
{"title":"Anisotropic dark energy universe in f(Q, T ) gravity with Observational constraints","authors":"Y.S. Solanke, A. P. Kale, D.D. Pawar, V.J. Dagwal","doi":"10.1139/cjp-2023-0127","DOIUrl":"https://doi.org/10.1139/cjp-2023-0127","url":null,"abstract":"Aim of this paper is to investigate an anisotropic locally rotationally symmetric (LRS) Bianchi type-I space–time in the context of the recently proposed f( Q, T) gravity, where Q is the non-metricity scalar and T is energy–momentum tensor. We have considered f( Q, T) = α Q + β T a linear form, where α and β are model parameters. We have analyzed the exact solution of LRS Bianchi type-I space–time by assuming relation between metric potential A = B n , where n is arbitrary non-zero real number. To study the anisotropic nature of the dynamical dark energy, we assume that the skewness parameters are time dependent and n ≠ 1. We have constrained to our model by using observational Hubble dataset. Onwards, discussed the physical behavior of cosmological parameters such as energy density, pressure, EoS parameter, deceleration parameter and, Energy conditions.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059620","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}
In this manuscript, the structural, opto-electronic, and thermodynamic properties of ZnAl2Se4 chalcogenide compounds were studied in detail using the full potential linearized augmented plane wave method. The exchange and correlation potentials used in density functional theory were calculated using local density approximation, the generalized gradient approximation (GGA) method, and the modified Becke–Johnson (mBJ) potential using Wien2k code. The obtained results were compared with each other as well as with available experimental data. At ambient conditions, ZnAl2Se4 is a direct wide bandgap (Г–Г) semiconductor with a bandgap of 2.1 and 3.3 eV with GGA and mBJ potentials, respectively. Density of states (DOS; total DOS and Partial Density Of States (PDOS)) and electron density contour plots were in similar accordance with bandgap, showing semiconductive behavior and covalent bonding nature. The optical properties like the real and imaginary parts of the dielectric constant, the energy loss function L( ω), and the conductivity σ( ω) were calculated. Optical aspects show interaction among phonon and electron in terms of long-range and short-range forces. The studied compound is very useful for various linear–nonlinear optical devices, so this compound is very valuable for several linear–nonlinear optical devices. So this manuscript represents a comprehensive approach for calculating the complete set of useful properties of the ZnAl2Se4 compound, which can provide support for understanding various device phenomena such as electrochemical sensing, photovoltaics, and nonvolatile electronic memories.
{"title":"Ab-initio investigation of structural, opto-electronic, and thermodynamic properties of ZnAl2Se4 for photovoltaic applications","authors":"N. Erum, Javed Ahmad, M. Iqbal","doi":"10.1139/cjp-2023-0077","DOIUrl":"https://doi.org/10.1139/cjp-2023-0077","url":null,"abstract":"In this manuscript, the structural, opto-electronic, and thermodynamic properties of ZnAl2Se4 chalcogenide compounds were studied in detail using the full potential linearized augmented plane wave method. The exchange and correlation potentials used in density functional theory were calculated using local density approximation, the generalized gradient approximation (GGA) method, and the modified Becke–Johnson (mBJ) potential using Wien2k code. The obtained results were compared with each other as well as with available experimental data. At ambient conditions, ZnAl2Se4 is a direct wide bandgap (Г–Г) semiconductor with a bandgap of 2.1 and 3.3 eV with GGA and mBJ potentials, respectively. Density of states (DOS; total DOS and Partial Density Of States (PDOS)) and electron density contour plots were in similar accordance with bandgap, showing semiconductive behavior and covalent bonding nature. The optical properties like the real and imaginary parts of the dielectric constant, the energy loss function L( ω), and the conductivity σ( ω) were calculated. Optical aspects show interaction among phonon and electron in terms of long-range and short-range forces. The studied compound is very useful for various linear–nonlinear optical devices, so this compound is very valuable for several linear–nonlinear optical devices. So this manuscript represents a comprehensive approach for calculating the complete set of useful properties of the ZnAl2Se4 compound, which can provide support for understanding various device phenomena such as electrochemical sensing, photovoltaics, and nonvolatile electronic memories.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87211251","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}
By numerically solving the Gross-Pitaevskii equation with phenomenological dissipation term, we study the vortex formation properties of a three-dimensional dipolar Bose-Einstein condensate of $^{164}$Dy atoms. We studied the influence of the contact interaction between atoms on the formation mechanism of vortex. We also study how the dipole orientation affects the vortex formation properties and the number of vortices. We find that enhancing the interaction of short-range repulsion interaction or dipolar repulsion interaction can shorten the time to form a stable vortex structure and increase the number of vortices.
{"title":"Vortex Dynamics of a Three-dimensional Dipolar Bose-Einstein Condensate","authors":"Yuan-Sheng Wang","doi":"10.1139/cjp-2023-0055","DOIUrl":"https://doi.org/10.1139/cjp-2023-0055","url":null,"abstract":"By numerically solving the Gross-Pitaevskii equation with phenomenological dissipation term, we study the vortex formation properties of a three-dimensional dipolar Bose-Einstein condensate of $^{164}$Dy atoms. We studied the influence of the contact interaction between atoms on the formation mechanism of vortex. We also study how the dipole orientation affects the vortex formation properties and the number of vortices. We find that enhancing the interaction of short-range repulsion interaction or dipolar repulsion interaction can shorten the time to form a stable vortex structure and increase the number of vortices.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76225656","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}
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