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Communications in Theoretical Physics 2011年第10期56卷 745-750页

作者： i.f.barna KfKi Atomic Energy Research institute of the Hungarian Academy of Sciences Thermohydraulics Department(KFKI-AEKI)H-1525 BudapestP.O.Box 49Hungary

in this article we will present pure three dimensional analytic solutions for the Navier-Stokes and the continuity equations in Cartesian coordinates. The key idea is the three-dimensional generalization of the well-known self-similar Ansatz of Barenblatt. A geometrical interpretation of the Ansatz is given also. The results are the Kummer functions or strongly related. Our final formula is compared with other results obtained from group theoretical approaches.

关键词： Navier-Stokes equation self-similar solution

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Angular Differential Cross-Section for ionization of Helium in C^6＋ ion Collision

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Chinese Physics Letters 2004年第7期21卷 1258-1261页

作者： A.C.Gagyi-Palffy i.f.barna L.Gulyas K.Tokesi DepartmentofTheoreticalPhysics UniversityofBucharestRomania Max-Planck-instituteforPhysicsofComplexSystems NothnitzerStr.38O1187DresdenGermany instituteofNuclearResearch HungarianAcademyofScience(ATOMKI)1-1-4001DebrecenPOBox51Hungary

With the help of the density operator, the angular differential cross-section for ionization of helium is calculated within the framework of the one-centre atomic-orbital close-coupling method. We consider a naked C6+ ion as projectile with an energy of 2.5MeV/a.u. Our result agrees well with the experimental data and the other theoretical calculations such as the first Born approximation, various Distorted Wave models and the classical trajectory Monte Carlo simulation.

关键词： Monte Carlo methods

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The optical tweezer of skyrmions

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npj Computational Materials 2020年第1期6卷 484-490页

作者： Xi-Guang Wang Levan Chotorlishvili Vitalii K.Dugaev Arthur Ernst igor V.Maznichenko Nikita Arnold Chenglong Jia Jamal Berakdar ingrid Mertig Józef barnaś School of Physics and Electronics Central South University410083 ChangshaChina institut für Physik Martin-Luther Universität Halle-Wittenberg06099 HalleSaaleGermany Department of Physics and Medical Engineering Rzeszów University of Technology35-959 RzeszówPoland institute for Theoretical Physics Johannes Kepler UniversityAltenberger Straße 694040 LinzAustria Max Planck institute of Microstructure Physics Weinberg 206120 HalleSaaleGermany Soft Materials Lab Linz Institute of Technology LITJohannes Kepler University LinzAltenberger Straße 694040 LinzAustria Department of Soft Matter Physics Institute for Experimental PhysicsJohannes Kepler UniversityAltenberger Straße 694040 LinzAustria Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University730000 LanzhouChina faculty of Physics Adam Mickiewicz University61-614 PoznańPoland

in a spin-driven multiferroic system,the magnetoelectric coupling has the form of effective dynamical Dzyaloshinskii–Moriya(DM)***,it is confirmed,for instance,for Cu_(2)OSeO_(3),that the DM interaction has an essential role in the formation of skyrmions,which are topologically protected magnetic *** skyrmions are very robust and can be manipulated through an electric *** external electric field couples to the spin-driven ferroelectric polarization and the skyrmionic magnetic texture emerged due to the DM *** this work,we demonstrate the effect of optical *** a particular configuration of the external electric fields it is possible to trap or release the skyrmions in a highly controlled *** functionality of the proposed tweezer is visualized by micromagnetic simulations and model analysis.

关键词： interaction field instance

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