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Mg-doped LaAlO3 structure: A theoretical investigation of indirect to direct bandgap and brittle to ductile transition 掺杂mg的LaAlO3结构:间接带隙到直接带隙和脆性到韧性转变的理论研究
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-03-08 DOI: 10.1139/cjp-2022-0325
Aliza Zahoor, Tariq Mahmood, Muhammad Isa Khan
{"title":"Mg-doped LaAlO3 structure: A theoretical investigation of indirect to direct bandgap and brittle to ductile transition","authors":"Aliza Zahoor, Tariq Mahmood, Muhammad Isa Khan","doi":"10.1139/cjp-2022-0325","DOIUrl":"https://doi.org/10.1139/cjp-2022-0325","url":null,"abstract":"Integrating chemical dopants into a pure lattice has fueled a novel concept of tuning the physical and chemical properties of existing materials under and beyond ambient conditions. By using first-principles calculation, we report the structural, electronic, elastic, and optical properties of pure and Mg-doped LaAlO<sub>3</sub> structure (La<sub>1-x</sub>Mg<sub>x</sub>AlO<sub>3</sub> and LaAl<sub>1-x</sub>Mg<sub>x</sub>O<sub>3</sub>), respectively, with the doping concentrations of x = 0%, 20%, 40%, 60%, 80%, and 100%. Our results show that Mg dopants induce metallicity along La sites at x = 60% with a reduced bandgap from 3.01 eV to 0.04 eV, as well as indirect to direct bandgap transition along Al sites at x = 40%. The density of states shows that the valence band shifts towards the Fermi level by inducing a metallicity in La<sub>1-x</sub>Mg<sub>x</sub>AlO<sub>3</sub> format at 60% configuration. Mechanically, LaAlO3 experiences brittle to ductile transition for both dopingsystems except LaAl<sub>1-x </sub>Mg<sub>x</sub>O<sub>3</sub> at 40% configuration. The higher ranges of optical peaks for both systems are identified for 0‒40% ranges as compared to other configurations. Fortunately, this study reveals the tunability of LaAlO<sub>3</sub> structure in structural, electronic, elastic, and optical aspects and also extends the availability of this material for future optoelectronic and mechanical applications.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79982836","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}
引用次数: 0
Study of 6,8He+p elastic scattering using BHF Formalism with Three Body Force 用三体力BHF形式研究6,8 he +p弹性散射
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-03-08 DOI: 10.1139/cjp-2022-0271
M. Sharma, Syed Rafi, W. Haider
{"title":"Study of 6,8He+p elastic scattering using BHF Formalism with Three Body Force","authors":"M. Sharma, Syed Rafi, W. Haider","doi":"10.1139/cjp-2022-0271","DOIUrl":"https://doi.org/10.1139/cjp-2022-0271","url":null,"abstract":"In the present work we have analysed the elastic scattering data of 6He+p at 25.6, 38.6, 40.9 and 71 MeV/A and 8He+p at 15.6, 25.6, 32.5, 66 and 72 MeV/A, using the microscopic local optical potential calculated within the framework of Brueckner-Hartree-Fock (BHF) formalism. The calculation requires mainly two inputs: (1) the nucleon-nucleon (NN) interaction and (2) the nucleon distributions in target nuclei. Realistic inter-nucleon (NN) potential Argonne v18 (AV18) along with the Urbana IX (UVIX) model of three body force with several nucleon density distributions is used in the present work for generating the nucleon-nucleus optical potential. We have used the exact method for calculating both the direct and the exchange parts of the spin-orbit potential. We reconfirm the earlier results that the spin orbit potential for these neutron rich nuclei is diffused and extended. Our results show that the different density distributions reproduce rather well the experimental differential cross sections for both isotopes, while the phenomenological density with two neutron halo gives satisfactory results for 6He-p analysing power data. None of the densities used for 8He can reproduce the experimental analyzing power data. Our analysis reveals that the calculated microscopic optical potentials, with and without three body force using BHF approach provides satisfactory agreement with the elastic scattering data for 6,8He+p.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84333559","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}
引用次数: 0
Analysis of linearized Weyl gravity via the Hamilton-Jacobi method 用Hamilton-Jacobi方法分析线性化Weyl重力
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-02-16 DOI: 10.1139/cjp-2023-0028
A. Escalante, Víctor Alberto Zavala-Pérez
{"title":"Analysis of linearized Weyl gravity via the Hamilton-Jacobi method","authors":"A. Escalante, Víctor Alberto Zavala-Pérez","doi":"10.1139/cjp-2023-0028","DOIUrl":"https://doi.org/10.1139/cjp-2023-0028","url":null,"abstract":"The Hamilton-Jacobi formalism is used to analyze the Weyl theory in the weak-field limit. The complete set of involutive Hamiltonians is obtained, which are classified into involutive and non-involutive. The counting of degrees of freedom is performed. Additionally, the generalized brackets and gauge symmetries are reported.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74145807","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}
引用次数: 0
Information measures on matter-wave solitons in Bose-Einstein condensates 玻色-爱因斯坦凝聚体中物质波孤子的信息测度
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-02-14 DOI: 10.1139/cjp-2022-0221
Bijan Layek, S. Sultana, G. A. Sekh
{"title":"Information measures on matter-wave solitons in Bose-Einstein condensates","authors":"Bijan Layek, S. Sultana, G. A. Sekh","doi":"10.1139/cjp-2022-0221","DOIUrl":"https://doi.org/10.1139/cjp-2022-0221","url":null,"abstract":"We consider quasi-one-dimensional Bose-Einstein condensates and study the properties of matter-wave bright solitons within the framework information theoretic approach. In the limit of negligible trapping effect, we calculate Shannon entropy, Fisher information and R{'e}nyi entropy for different mean-field interaction, and study the interplay between group velocity dispersion and nonlinear atomic interaction. We see that information theoretic approach can clearly reveal localization and delocalization properties of matter-wave density distribution. In all the cases, entropic uncertainties are found to be satisfied.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88822006","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}
引用次数: 1
Numerical Study of The Effect of Heat-flow Coupling on Interface Instability Based on Front-Tracking 基于前跟踪的热流耦合对界面不稳定性影响的数值研究
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-02-14 DOI: 10.1139/cjp-2022-0093
Yao Liu, M. Yao, Zhaoqing Ke, Kangshuai Chen, Ying Zhang, Wei Wu
{"title":"Numerical Study of The Effect of Heat-flow Coupling on Interface Instability Based on Front-Tracking","authors":"Yao Liu, M. Yao, Zhaoqing Ke, Kangshuai Chen, Ying Zhang, Wei Wu","doi":"10.1139/cjp-2022-0093","DOIUrl":"https://doi.org/10.1139/cjp-2022-0093","url":null,"abstract":"The interfacial instability of two-phase immiscible fluids in inclined tubes at constant temperature boundary conditions is numerically investigated by the Front-Tracking Method (FTM). By analyzing the effects of inclination angle , Marangoni number (Ma) and Rayleigh number (Ra) on the interfacial instability, the interaction law between unstable interface fluctuation and heat transfer is studied. The results show that the larger the inclination angle, the easier the interface is destabilized, and the heat transfer at the interface will also decrease. In the comparison of inclination angles of 0°, 30°, 45° and 60°, the heat transfer is more stable at 45°. The heat flux between fluids decreases with the increase of Ma number, and Ma number has little effect on the interfacial fluctuation. It mainly affects the interfacial morphology by changing the surface tension gradient at the interface, which is mainly reflected in the end of the convolution interface. The larger the Ma number, the more inward the interface develops. Ra number has an obvious inhibitory effect on the interfacial instability. The effect of Ra number on heat flow transfer at the interface shows alternating changes. In the initial stage, the heat transfer between fluids in the inclined tube is greater than that in the horizontal tube, but in the later stage, the heat transfer is less than that in the horizontal tube.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83804967","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}
引用次数: 0
Poisson's equation in semiconductors: impact of charge depletion on Hall effect measurements 半导体中的泊松方程:电荷耗尽对霍尔效应测量的影响
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-02-07 DOI: 10.1139/cjp-2022-0158
R. Masut
{"title":"Poisson's equation in semiconductors: impact of charge depletion on Hall effect measurements","authors":"R. Masut","doi":"10.1139/cjp-2022-0158","DOIUrl":"https://doi.org/10.1139/cjp-2022-0158","url":null,"abstract":"Space-charge effects are familiar to students of solid state physics, semiconductor devices, and surface science. They are usually estimated under the strong depletion or space-charge layer approximation (SCLA), whose limitations are rarely fully discussed. A formal description of these effects is presented, followed by numerical solutions to a one-dimensional Poisson's equation. This equation is valid in cases of charge depletion and of mild accumulation near surfaces and interfaces. Poisson's equation as it applies to a film/substrate interface is analyzed to obtain the boundary condition for the potential at the metallurgical junction. A practical applied example discusses the impact of depletion effects on the determination of the charge carrier concentration by Hall effect measurement in homoepitaxial semiconductor thin films. Examples are highlighted where the SCLA is not an accurate approximation.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85238494","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}
引用次数: 0
Analytical Energy Eigenvalues of a Dirac Particle in Focusing Field of a Quadrupole Magnet 四极磁体聚焦场中狄拉克粒子的解析能量特征值
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-01-16 DOI: 10.1139/cjp-2022-0286
H. F. Kisoglu
{"title":"Analytical Energy Eigenvalues of a Dirac Particle in Focusing Field of a Quadrupole Magnet","authors":"H. F. Kisoglu","doi":"10.1139/cjp-2022-0286","DOIUrl":"https://doi.org/10.1139/cjp-2022-0286","url":null,"abstract":"In the study, the motion of a charged spin-1/2 fermion is found out. It is assumed, in the system, that the free fermion is subjected to a linearly space-dependent magnetic field which can be supposed to be a focusing magnetic field of a quadrupole magnet in beam dynamics in the accelerator physics. In such an examination, two-component Dirac equation is solved via perturbation approximation of the Asymptotic Iteration Method, which has been widely used for the last decades. The results show that the fermion is bounded to the magnetic field for a certain condition of the strength of the field. For such a system, the analytical form of the energy eigenvalues are obtained. Moreover, to see whether this analytical expression works properly, the numerical eigenvalues are compared with the ones obtained by direct use of the AIM. We have an inspiration that the studies on beam dynamics and magnet design in particle accelerator physics may gain from this work.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76074646","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}
引用次数: 0
de Haas van Alphen oscillations in hybridization-gap insulators as a sudden change in the diamagnetic moment of Landau levels 朗道能级反磁矩的突然变化在杂化间隙绝缘体中的德哈斯范阿尔芬振荡
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-01-13 DOI: 10.1139/cjp-2022-0340
S. Julian
{"title":"de Haas van Alphen oscillations in hybridization-gap insulators as a sudden change in the diamagnetic moment of Landau levels","authors":"S. Julian","doi":"10.1139/cjp-2022-0340","DOIUrl":"https://doi.org/10.1139/cjp-2022-0340","url":null,"abstract":"This note revisits the semi-classical theory of quantum oscillations in hybridization-gap insulators, and argues that the physical origin of the oscillations, at T=0 K, is a sudden change in the diamagnetic moment of each Landau level as it crosses the hybridized region of the valence band.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78714505","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}
引用次数: 2
Quantized momentum Eigenstates and thermodynamic properties of the Feinberg-Horodecki equation for the Time-Dependent Wei-Hua Oscillator 时变魏华振Feinberg-Horodecki方程的量子化动量本征态和热力学性质
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-01-05 DOI: 10.1139/cjp-2022-0223
R. Horchani, A. Ikot, I. Okon, U. Okorie, L. Obagboye, A. Ahmadov, H.Y. Abdullah, K. W. Qadir, A. Abdel‐Aty
{"title":"Quantized momentum Eigenstates and thermodynamic properties of the Feinberg-Horodecki equation for the Time-Dependent Wei-Hua Oscillator","authors":"R. Horchani, A. Ikot, I. Okon, U. Okorie, L. Obagboye, A. Ahmadov, H.Y. Abdullah, K. W. Qadir, A. Abdel‐Aty","doi":"10.1139/cjp-2022-0223","DOIUrl":"https://doi.org/10.1139/cjp-2022-0223","url":null,"abstract":"In this study, we obtained exact solutions of the Feinberg–Horodecki equation for the time-dependent Wei-Hua potential, which is constructed by the temporal counterpart of the spatial form of this potential. We have obtained the quantized momentum eigenvalues and the corresponding wave functions. We obtain the partition function for the system and study other thermodynamic properties which include vibrational mean momentum (U), vibrational specific heat capacity (C), vibrational entropy (s) and vibrational free momentum (F) as a signature in the momentum space.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82012856","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}
引用次数: 0
On some comprehensive study of the Hall mobility of an ohmic ensemble of two-dimensional electrons confined in a quantum well of a heterostructure at low lattice temperatures 低晶格温度下异质结构量子阱中二维电子欧姆系综霍尔迁移率的一些综合研究
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-01-05 DOI: 10.1139/cjp-2022-0144
B. Roy, S. Bhattacharyya, D. Bhattacharya
{"title":"On some comprehensive study of the Hall mobility of an ohmic ensemble of two-dimensional electrons confined in a quantum well of a heterostructure at low lattice temperatures","authors":"B. Roy, S. Bhattacharyya, D. Bhattacharya","doi":"10.1139/cjp-2022-0144","DOIUrl":"https://doi.org/10.1139/cjp-2022-0144","url":null,"abstract":"The characteristic dependence of the Hall mobility upon the temperature of a degenerate ensemble of two-dimensional electrons in a well of heterostructure has been calculated in some broad details, for the ohmic field region, at the low temperatures. Apart from the electronic interactions with the remote ionized impurities and the surface roughness, the study also duly considers some factors which are often ignored for mathematical simplicity. These include, the inelasticity of the electron-phonon collisions and the true phonon distribution. The results thus obtained for heterostructures like AlGaAs/GaAs, AlGaN/GaN and AlInSb/InSb, show that the consideration of the above details significantly changes the overall characteristics, and makes them agree quite well with the experimental data.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78530117","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}
引用次数: 0
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