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fermion bound states in geometrically deformed backgrounds

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Chinese Physics C 2019年第1期43卷 1-8页

作者： D.Bazeia A.Mohammadi D.C.Moreira departamento de física Universidade Federal da Paraíba departamento de física Universidade Federal de Pernambuco Unidade Acadêmica de física Universidade Federal de Campina Grande

This work deals with the behavior of fermions in the background of kinklike structures in the twodimensional spacetime. The kinklike structures appear from bosonic scalar field models that engender distinct profiles and interact with the fermion fields via the standard Yukawa coupling. We first consider two models that engender parity symmetry, one leading to the exclusion of fermion bound states, and the other to the inclusion of bound states, when the parameter that controls the bosonic structure varies from zero to unity. We then investigate a third model where the kinklike solution explicitly breaks parity symmetry, leading to fermion bound states that are spatially asymmetric.

关键词： topological defect fermion interaction bound state

Charged scalar fields in a Kerr-sen black hole:exact solutions, Hawkingradiation, and resonant frequencies

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Chinese Physics C 2019年第3期43卷 91-98页

作者： H.s.Vieira V.B.Bezerra departamento de física Universidade Federal da Paraíba

In this study, we consider charged massive scalar fields around a Kerr-sen spacetime. The radial and angular parts of the covariant Klein-Gordon equation are solved in terms of the confluent Heun function. from the exact radial solution, we obtain the Hawking radiation spectrum and discuss its resonant frequencies. The massless case of the resonant frequencies is also examined.

关键词： Klein-Gordon equation charged and rotating black hole heterotic string field theory confluent Heun function black hole physics

Landesman–Lazer Type Conditions and Multiplicity Results for Nonlinear Elliptic Problems with Neumann Boundary Values

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Acta Mathematica sinica,English series 2014年第2期30卷 229-250页

作者： Edcarlos Domingos da sILVA francisco odair de PAIVA universidade federal de Gois Departamento de Matemtica universidade federal de so carlos Departamento de Matemtica

We establish the existence and multiplicity of solutions for steklov problems under non- resonance or resonance conditions using variational methods. In our main theorems, we consider a weighted eigenvalue problem of ... 详细信息

关键词： Neumann-steklov eigenvalue problems resonance Landesman-Lazer conditions

Unsuitable use of spin and pseudospin symmetries with a pseudoscalar Cornell potential

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Chinese Physics B 2014年第9期23卷 60-61页

作者： L.B.Castro A.s.de Castro departamento de física CFM Universidade Federal de Santa Catarina departamento de física Universidade Federal do Maranho Campus Universtitrio do Bacanga departamento de física e Química Campus de Guaratinguet Universidade Estadual Paulista

The concepts of spin and pseudospin symmetries has been used as mere rhetorics to decorate the pseudoscalar potential [Chin. Phys. B 22 090301 （2013）]. It is also pointed out that a more complete analysis of the bou... 详细信息

关键词： Dirac equation pseudoscalar Comell potential spin symmetry pseudospin symmetry

Rotating effects on the photoionization cross-section of a 2D quantum ring

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Communications in Theoretical Physics 2024年第10期76卷 151-157页

作者： carlos Magno o Pereira frankbelson dos s Azevedo Luís fernando C Pereira Edilberto o silva departamento de física Universidade Federal do Maranhão65085-580 São LuísMaranhãoBrazil

In this article,we investigate the nonrelativistic quantum motion of a charged particle within a rotating frame,taking into account the Aharonov–Bohm(AB)effect and a uniform magnetic *** analysis entails the derivation of the equation of motion and the corresponding radial equation to describe the *** the resulting radial equation enables us to determine the eigenvalues and eigenfunctions,providing a clear expression for the energy ***,our numerical analysis highlights the substantial influence of rotation on both energy levels and optical ***,we evaluate the photoionization cross-section with and without the effects of *** elucidate the impact of rotation on the photoionization process of the system,we present graphics that offer an appealing visualization of the intrinsic nature of the physics involved.

关键词： photoionization cross-section rotating effect quantum ring Aharonov–Bohm effect

Coherent-interface-induced strain in large lattice-mismatched materials:A new approach for modeling Raman shift

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Nano Research 2022年第3期15卷 2405-2412页

作者： Andrian V.Kuchuk fernando Mde oliveira Pijush K.Ghosh Yuriy I.Mazur Hryhorii V.stanchu Marcio D.Teodoro Morgan E.Ware Gregory J.salamo Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA departamento de física Universidade Federal de São CarlosSão CarlosSP 13565-905Brazil department of Electrical Engineering University of ArkansasFayettevilleAR 72701USA

strain engineering as one of the most powerful techniques for tuning optical and electronic properties of III-nitrides requires reliable methods for strain *** this work,we reveal,that the linear model based on the experimental data limited to within a small range of biaxial strains(s widely used for the non-destructive Raman study of strain with nanometer-scale spatial resolution is not valid for the binary wurtzite-structure group-III nitrides GaN and ***,we found that the discrepancy between the experimental values of strain and those calculated via Raman spectroscopy increases as the strain in both GaN and AlN ***,a new model has been developed to describe the strain-induced Raman frequency shift in GaN and AlN for a wide range of biaxial strains(up to 2.5%).finally,we proposed a new approach to correlate the Raman frequency shift and strain,which is based on the lattice coherency in the epitaxial layers of superlattice structures and can be used for a wide range of materials.

关键词： Raman spectroscopy strain lattice coherency III-nitrides high-resolution X-ray diffraction(HRXRD)

Neutrino masses,cosmological inflation and dark matter in a variant U(1)B-L model with type II seesaw mechanism

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Chinese Physics C 2021年第2期45卷 621-630页

作者： J.G.Rodrigues A.C.o.santos J.G.ferreira Jr C.A.de s.Pires departamento de física Universidade Federal da ParaíbaCaixa Postal 500858051-970João PessoaPBBrasil departamento de física Universidade Federal do Rio Grande do Norte59078-970NatalRNBrasil

In this study,we implemented the type Ⅱ seesaw mechanism into the framework of the U(l)B-L gauge *** achieve this,we added a scalar triplet,A,to the canonical particle content of the U(l)B-Lgauge *** imposing that the U(l)B-L gauge symmetry be spontaneously broken at TeV scale,we show that the type Ⅱ seesaw mechanism is realized at an intermediate energy scale,more precisely,at approximately 109 *** prevent heavy right-handed neutrinos from disturbing the mechanism,we evoke a Z2 discrete ***,as a result,we have standard neutrinos with mass around eV scale and right-handed neutrinos with mass in TeV scale,with the lightest one fulfilling the condition of dark *** developed all of these in this *** addition,we show that the neutral component of Δ may perform unproblematic non-minimal inflation with loss of unitarity.

关键词： models beyond the standard model particle-theory and field-theory models of the early universe neutrino mass and mixing

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Journal of Energy Chemistry 2022年第10期31卷 88-113,I0003页

作者： Magno B.Costa Moisés A.de Araújo Marcos V.de Lima Tinoco Juliana f.de Brito Lucia H.Mascaro departamento de Química Universidade Federal de São CarlosRodovia Washington Luizkm 235São CarlosSão Paulo 13565-905Brazil Instituto de Química de são carlos Universidade de São PauloAvenida Trabalhador Sancarlense400São CarlosSão Paulo 13566-590Brazil Instituto de Química Universidade Estadual PaulistaRua Professor Francisco Degnis/nAraraquaraSão Paulo 14800-900Brazil

This review shows the importance of Wo_(3)photoanode as a potentially low-cost,efficient,stable,and photoactive material for light-driven water *** such,this manuscript aims to review the most recent publications regarding the strategies to improve the phoelectroactivity of Wo_(3)films for water *** addition,this review aims to graphically highlight and discuss the general trendings of the photocurrent density response and stability test of the recent outstanding studies in the literature for photoelectrochemical water splitting *** strategies covered in this review will not only concern the Wo_(3)morphology and crystal plane growth,but also the many arrangements possibilities to improve the Wo_(3)efficiency for water photoelectrooxidation,such as defect engineering based on oxygen vacancies,doping,decorations,and homo and *** these strategies are compared by the photocurrent density results and by the stability of these *** best results in this sense were observed in cases where the use of heterojunction was applied together with a desired morphology and crystal plane of the Wo_(3)***,the modifications that caused a decrease in the photocurrent density reaching values that are even lower than the pure Wo_(3)were also *** this way,this review intends to improve the knowledge about the synthesis and design of Wo_(3)photoanodes to further obtain an efficient photocatalyst to minimize the recombination losses or losses across the interfaces and improve the photoelectroactivity for water splitting in the large-scale application.

关键词： solar energy H_(2)production N-type semiconductor Photoelectrode design oxygen evolution reaction

stellar structure Model in the Post-Newtonian Approximation

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Research in Astronomy and Astrophysics 2022年第12期22卷 232-238页

作者： Gilberto M.Kremer departamento de física Universidade Federal do ParanáCuritiba 81531Brazil

In this work the influence of the post-Newtonian corrections to the equations of stellar structure are *** post-Newtonian Lane-Emden equation follows from the corresponding momentum density balance *** a polytropic equation of state the solutions of the Lane-Emden equations in the Newtonian and post-Newtonian theories are determined and the physical quantities for the sun,the white dwarf sirius B and neutron stars with masses M■1.4 M_(⊙),1.8 M_(⊙)and 2.0 M_(⊙)are *** is shown that the post-Newtonian corrections to the fields of mass density,pressure and temperature are negligible for the sun and sirius B,but for stars with strong fields the differences become *** the neutron stars analyzed here the central pressure and the central temperature which follow from the post-Newtonian Lane-Emden equation are about fifty to sixty percent greater than those of the Newtonian theory and the central mass density is about three to four percent smaller.

关键词： stars:neutron stars:fundamental parameters hydrodynamics