Revista Mexicana De Fisica最新文献_第6页

Improved electrical characteristics of AlxGa1−xN/GaN High Electron Mobility Transistor by effect of physical and geometrical parameters 物理和几何参数对AlxGa1−xN/GaN高电子迁移率晶体管电学特性的影响

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-07-04 DOI: 10.31349/revmexfis.69.041001

A. Douara, A. Rabehi, Oussama Baitiche, M. Handami

引用次数: 0

Flat bands, quantum Hall effect and superconductivity in twisted bilayer graphene at magic angles 在魔角下扭曲双层石墨烯的平带、量子霍尔效应和超导性

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-07-04 DOI: 10.31349/revmexfis.69.041602

Leonardo Antonio Navarro Labastida, G. G. Naumis

{"title":"Flat bands, quantum Hall effect and superconductivity in twisted bilayer graphene at magic angles","authors":"Leonardo Antonio Navarro Labastida, G. G. Naumis","doi":"10.31349/revmexfis.69.041602","DOIUrl":"https://doi.org/10.31349/revmexfis.69.041602","url":null,"abstract":"Flat band electronic modes are responsible for superconductivity in twisted bilayer graphene (TBG) rotated at magic angles. From there other magic angles can be found for any multilayered twisted graphene systems. Eventually, this lead to the discovery of the highest ever known electron-electron correlated material. Moreover, the quantum phase diagram of TBG is akin to those observed among high-Tc superconductors and thus there is a huge research effort to understand TBG in the hope of clarifying the physics behind such strong correlations. A particularity of the TBG is the coexistence of superconductivity and the fractional Quantum Hall effect, yet this relationship is not understood. In this work, a simple 2 × 2 matrix model for TBG is introduced. It contains the magic angles and due to the intrinsic chiral symmetry in TBG, a lowest energy level related to the quantum Hall effect. The non-Abelian properties of this Hamiltonian play a central role in the electronic localization to produce the flat bands and here it is proved that the squared Hamiltonian of the chiral TBG model is equivalent to a single electron Hamiltonian inside of a non-Abelian pseudo-magnetic field produced by electrons in other layers. Therefore, the basic and fundamental elements in the physics of magic angles are determined. In particular, a study is made on these fundamental energy contributions at the Γ-point due to its relation to the recurrence of magic angles and its relationship with the Quantum Hall effect.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48241641","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

A static spherically symmetric perfect fluid solution to model the interior of stars 一个静态的球对称的完美流体解决方案来模拟恒星的内部

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.030701

Gabino Estevez Delgado, Joaquin Estevez Delgado, Elivet Aguilar Campuzano

引用次数: 0

Comprehensive examination of the elastic scattering angular distributions of 10C+4He, 27Al, 58Ni and 208Pb using various potentials. 10C+4He, 27Al, 58Ni和208Pb在不同电位下弹性散射角分布的综合研究。

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.031201

M. N. El-Hammamy, A. Ibraheem, M. El-Azab Farid, E. Elshamy, Shigetaka Hamada

引用次数: 0

Catching CO2 pollutant gas through nanocomposite formed by chitosan with non-circular C16 carbon double ring: VAMP study 壳聚糖与非圆C16碳双环形成纳米复合物捕集CO2污染气体的VAMP研究

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.031003

J. Pacheco-Sánchez, F. J. Isidro-Ortega, I. Zaragoza

引用次数: 0

Production of Al2O3-SiC composites from micrometer α-Al2O3 powder obtained via sol-gel 溶胶-凝胶法制备微米级α-Al2O3复合材料

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.031601

Quetzalmaflor Miranda, I. I. López López, J. Lemus Ruiz, A. Contreras-Cuevas, J. Zárate-Medina

{"title":"Production of Al2O3-SiC composites from micrometer α-Al2O3 powder obtained via sol-gel","authors":"Quetzalmaflor Miranda, I. I. López López, J. Lemus Ruiz, A. Contreras-Cuevas, J. Zárate-Medina","doi":"10.31349/revmexfis.69.031601","DOIUrl":"https://doi.org/10.31349/revmexfis.69.031601","url":null,"abstract":"Alumina (Al2O3) is an advanced ceramic material developed for different applications as refractories, precision tools, pacemaker, etc. Solid state sintering of alumina or matrix ceramic composites (CMCs) compacts starts from powders. Once method to produce high quality aluminum oxide powders is the sol-gel technique. Alumina begins as pseudo-crystallized aluminum hydroxide gel which is produced under moderate reaction conditions trough a colloidal suspension. In this work, Al2O3 powder was produced by precipitation of pseudoboehmite (PB) through sol-gel process. Subsequently, a mixture of Al2O3/SiC powders with 5 wt.% of SiC as reinforcement was produced. This mixture was used to manufacture green compacts by uniaxial pressing at 440 MPa. Afterward, some samples were applied a heat treatment (pre-sintered) at 1200°C for 6 h in air. Sintering was carried out in a vertical dilatometer Linseis L75 V up to 1500°C for 2h under argon atmosphere. Pseudobohemite, alumina powders and Al2O3/SiC composites were characterized through X-ray diffraction technique and Scanning Electron Microscopy (SEM). Dilatometric shrinkage data into densification curves obtained were analyzed. Images obtained with SEM showed a uniform Al2O3 powder morphology of submicron size, otherwise Al2O3/SiC composite images showed the interaction of the reinforcement particles on the ceramic matrix. Experimental results demonstrated the pre-sintering reduce the decomposition of SiC particles on the compact surface. This behavior was attributed to formation of SiO2 around the reinforcement particle due it act as protective barrier.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43802905","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

Effect of transverse magnetic field on dose distributions of yttrium 90 skin patch source 横向磁场对钇90皮片源剂量分布的影响

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.031102

H. Epik

{"title":"Effect of transverse magnetic field on dose distributions of yttrium 90 skin patch source","authors":"H. Epik","doi":"10.31349/revmexfis.69.031102","DOIUrl":"https://doi.org/10.31349/revmexfis.69.031102","url":null,"abstract":"The total dose absorbed on the tumor cell from the skin patch sources used in clinical superficial brachytherapy should be limited within the target tumor volume in order to minimize the potential side effects. Average range of the beta particles within tissue may exceed the thickness of a superficial skin tumor beyond the target tumor volume, causing side effects by damaging the deeper located healthy tissue and the bone underneath the tumor. It is desired to minimize the possible side effects by selecting a short-range radionuclide. Administering the treatment under an external magnetic field is another option for reducing side effects. To achieve this, in this study, the percentage deep dose (PDD) and transverse dose profile (TDP) distributions of the skin patch source labeled with Yttrium 90 (90Y) using the GEANT4-based GAMOS Monte Carlo code were examined before and after applying magnetic field, and it was evaluated whether it was possible to limit the dose within a certain volume or not. \u0000Simulation results showed that, along with the application of a transverse magnetic field, the dose values increased by 7.2% and 3.1% respectively at 0.25 mm and 1.0 mm depths whereas it decreased by 9.4%, 25.0%, 41.8% and 57.6%, at 2.0 mm, 3.0 mm, 4.0 mm and 5.0 mm depths respectively on the central axis from the surface of the tissue phantom with respect to the 0 T values of the field. In case of a superficial skin tumor with a thickness of 3.0 mm from the skin surface, the amount of dose accumulated in the tumor volume for 0 T value of the transverse magnetic field was 89% of the total dose, while it increased to 98% at the intensity of 1.5 T, and the dose received by the healthy tissue under the tumor decreased by 10.1%.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41949451","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

The influence of noncommutativity on the energy spectra of bosonic particles in the framework of the DKGE with improved spatially-dependent mass including mixed scalar-vector Coulomb potentials in the ERQM symmetries 非交换性对改进空间依赖质量的DKGE框架中玻色子粒子能谱的影响，包括ERQM对称中的混合标量-矢量库仑势

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.030801

A. Maireche

{"title":"The influence of noncommutativity on the energy spectra of bosonic particles in the framework of the DKGE with improved spatially-dependent mass including mixed scalar-vector Coulomb potentials in the ERQM symmetries","authors":"A. Maireche","doi":"10.31349/revmexfis.69.030801","DOIUrl":"https://doi.org/10.31349/revmexfis.69.030801","url":null,"abstract":"The bound state solutions of the deformed Klien-Gordon equation (DKGE) have been determined in the extended relativistic quantum mechanics ERQM symmetries using the improved spatially-dependent mass Coulomb potential with mixed scalar-vector Coulomb potentials (ISDM-SVCPs) model. The spatially-dependent mass Coulomb potential, as well as a combination of ((1/(r³)) and (1/(r⁴))), are included in the ISDM-SVCPs model, which is coupled with the coupling LΘ, which explains the interaction of the physical features of the system with the topological deformations of space-time. The new relativistic energy eigenvalues for the ISDM-CP have been derived using the parametric Bopp's shift method and standard perturbation theory. Quantum numbers (j,l,s,m), mixed potential depths (q/s_{c},m₀,m₁), and noncommutativity parameters (Θ,τ,χ) seemed to affect the new values we obtained. Within the framework of relativistic extended quantum mechanics, we have addressed certain significant particular instances that we hope will be valuable to the specialized researcher. In DKGE symmetries, we've also looked at the improved pure scalar Coulomb-like potential. The formulation of total energy was also discovered in the context of extended symmetries, which unified the energies of bosonic particles and antiparticles into a single mathematical formula. When the three simultaneous limits (Θ,τ,χ) were applied, we recovered the normal results of relativistic in the literature (0,0,0).","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47250954","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

Complex Fourier demodulation approach for the dual rotation polarizer-analyzer polarimeter 双旋转偏振分析仪偏振计的复傅立叶解调方法

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.031301

J. Cervantes-L, G. P. Parra Escamilla, J. F. Flores Nuñez, D. I. Serrano Garcia

引用次数: 0

Stirnol Engine: A combination of Nitinol (shape memory alloy) and Gamma Stirling Engine 斯特灵发动机:结合镍钛诺(形状记忆合金)和伽玛斯特灵发动机

4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-05-01 DOI: 10.31349/revmexfis.69.030601

H. Arif, A. Shah, T. A. Hussain Ratlamwala, K. Kamal, M. Ahmed

引用次数: 0