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Laser beam effect on the entanglement of elastic collisions in quantum plasma

Communications in Theoretical Physics 2024年第8期76卷 147-155页

作者： ramin roozehdar mogaddam Nasser Sepehri Javan Hosein Mohammadzadeh Department of Physics Ferdowsi University of MashhadPO Box 1436MashhadIran Department of Physics University of Mohaghegh ArdabiliPO Box 179ArdabilIran

In the quantized field formalism, using Kramers-Henneberger unitary transformation as the semi-classical counterpart of Block-Nordsieck transformation, the dynamics of entanglement during the low energy scattering processes in bi-partite systems at the presence of a laser beam fields are studied. The stationary-state Schrodinger equation for the quantum scattering process is obtained for such systems. Then, using partial wave analysis, we introduce a new form of entanglement fidelity considering the effect of high-intensity laser beam fields. The effective potential of hot quantum plasma including plasmon and quantum screening effects is used to obtain the entanglement fidelity ratio as a function of the laser amplitude, and plasmon and Debye length parameters for the elastic electron-ion collisions. It is shown that the plasma free electrons oscillations under interaction with laser beam fields improve the correlations between charged particles and consequently lead to the increase in the system entanglement.

关键词： laser entanglement quantum plasma elastic collision plasmon fidelity

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Characteristics of a Silicon Wafer <111>and <004>after Planting Nitrogen

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Advances in Materials Physics and Chemistry 2017年第5期7卷 173-187页

作者： Mehdi Simiari ramin roozehdar mogaddam Faculty of Science Emam Ali University Tehran Iran

In this paper, different steps of work and experiments that are done in order to implant nitrogen ion in silicon with the energy of 25 keV, density of 24 μA/cm2 and doses of 5 × 1013 atom/cm2, 1?× 1014 atom/cm2 and 1?× 1015 atom/ cm2 (according to the calculation and applying time at planting) at room temperature (in the lack of heat phase) and without annealing will be presented. The XRD analysis is done before and after planting to observe changes in the lattice and the possibility of forming a crystalline phase of silicon nitride in this case. Also, the study of changes in the lattice arrangement and AFM analysis is done to observe the topography of the surface. Besides, the investigation on surface roughness and changes caused by ion implantation on the surface and spectrophotometry analysis before and after planting due to the study of changes in optical properties are done.

关键词： Silicon Wafer Nitrogen Ion Implantation XRD Analysis AFM Analysis Spectrophotometry Analysis

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Conceptual Design of Beam Tube of 300 KeV Electron Electrostatic Accelerator

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Journal of Applied Mathematics and Physics 2017年第9期5卷 1763-1775页

作者： Seied Isa Karanian ramin roozehdar mogaddam Elnaz Seifnouri Mehdi Amiri Faculty of Science Emam Ali University Tehran Iran Physics Department Islamic Azad University Karaj Branch Iran Department of Physics University of Mohaghegh Ardabili Ardabil Iran

The column of electron electrostatic accelerator is one of the critical components in electrostatic accelerator. The geometrical design of such accelerator must be as such that in the case of applying voltage to its electrodes, not only should its equipotential surfaces and its gradient accelerate the beam particles up to desired energy, but also it should focus the beam and hinder broadening of energy distribution of accelerated particles. The immersed electrodes in the field are, geometrically, perpendicular to optical axis around the medial plane. Numerous models that can be used in the distribution of axial potential, have been presented and linear model, analytical model, double-column electrode model and polynomial electrode model are among them. In this paper, series expansions based on Bessel functions is used to obtain the axial potential distribution of immersed accelerator electrodes in double-electrode field and it is then compared to the mentioned models by solving the final equation via the least square method. Finally, by using CST Studio software and the information we obtained from the axial potential, the column of electron accelerator with its energy distribution and its optimal electron output beam radius is designed and simulated.

关键词： Accelerator Tube Lenses Immersed in the Field Axial Potential Distribution Electrode

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Assessment of Nanothermodynamic Properties of Ferromagnetic Nanocluster in Subdivision Potential Approach and Magnetic Field

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Journal of Applied Mathematics and Physics 2016年第12期4卷 2233-2246页

作者： Mehdi Simiari ramin roozehdar mogaddam Meysam Ghaebi Elham Farshid Mohammad Ebrahim Zomorrodian Faculty of Science Emam Ali University Tehran Iran Department of Physics Ferdowsi University of Mashhad Mashhad Iran Department of Physics University of Mohaghegh Ardabili Ardabil Iran

Using subdivision potential approach and mean-field theory for a ferromagnetic cluster, we obtained nanothermodynamic properties for a ferromagnetic nanocluster in the presence and also the absence of the magnetic field. The subdivision potential and the magnetic field both makes Gibbs and Helmholtz free energies of the ferromagnetic nanocluster stand at a lower level compared to those of the ferromagnetic cluster. Our main conclusion is that the presence of the magnetic field leads to decrease in the amount of specific heat capacity for the ferromagnetic cluster. On the other hand, this effect leads to increase in the amount of specific heat capacity for the ferromagnetic nanocluster.

关键词： Subdivision Potential Mean-Field Theory Ferromagnetic Nanocluster Nanothermodynamic

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