Investigation of the Gauss model on improvement of permittivity and optical absorption of TMDC monolayers in the visible spectrum
Narges
Ansari
دانشگاه الزهرا
author
Farinaz
Ghorbani
دانشجو
author
Maryam
Moradi
دانشجو
author
text
article
2018
per
2-dimensional layers of transition metal dichalcogenids (TMDCs) with direct band gap in the visible and infrared range have shown open horizon in photonics and optoelectronics. Among TMDC family, MoSe2, WSe2, MoS2 and WS2 monolayers have shown special optical properties. In this paper, the permittivity constant of aforementioned monolayers are calculated based on Lorentz, Lorentz- Gauss and Lorentz –Drude-Gauss models with quite acceptable consistency to their experimental values. Optical absorption response of these photovoltaic monolayers is similar to imaginary component of their permittivity. In addition, based on investigation of optical absorption in presence of substrates, it is found that the absorption decreases which is more pronounced while refractive index of substrates increases. Such thin layers with absorption efficiency above 10% with thickness below 1 nm are suitable candidates for solar cell and photovoltaic applications.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
1
11
http://jrmbs.scu.ac.ir/article_13629_ef5136498d9788b4c8c88d56e8a0029c.pdf
dx.doi.org/10.22055/jrmbs.2018.13629
Design of structures including MoS2 monolayer with low absorption at THz range for application in transparent electrodes
Ensiyeh
Mohebbi
Department of Physics, Alzahra University, Tehran,iran
author
Narges
Ansari
دانشگاه الزهرا
author
text
article
2018
per
Two dimensional Molybdenum disulfide, MoS2, crystal has attracted intense attention for its application in the THz optoelectronics and can be used for transparent electrode in the nanoscale research area. In this paper, we design structures including MoS2 monolayer on different substrates and different layer positions in one-dimensional photonic crystals (1DPCs) toward decreasing the optical absorption and increasing the optical transmission. The THz refractive index of MoS2 taken from Drude model is calculated. Transmission and absorption spectra in the THz range for either of TE or TM modes is calculated based on the transfer matrix method (TMM). In continue we show that the absorption spectrum can be tuned by changing different materials and incident angles for either of TE or TM modes. We finally in our best design achieved absorption smaller than MoS2 monolayer and nearly 100% transmission. Such results are useful for application in nano-bulding blocks including transparent electrode in future photonics and electronics devices.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
13
20
http://jrmbs.scu.ac.ir/article_13632_73a66a384a76730fe765c7af63570b2d.pdf
dx.doi.org/10.22055/jrmbs.2018.13632
Investigation of the electro-optical properties of graphene with BC3 substrate
Somayeh
Behzad
Departm ent of Engineering Physic s, Kermanshah Unive rs ity of Te chnology
author
Raad
Chegel
Physics Department, Faculty of Science, Malayer University
author
text
article
2018
per
In this article, the electronic and optical properties of graphene with BC3 substrate are investigated. The calculations are performed on the basis of full potential linearized augmented plane waves in the framework of density functional theory. The total energy calculations of AA and AB configurations show that the AB stacking configuration is more stable than AA stacking configuration. The monolayer graphene has zero band gap while graphene with BC3 substrate has a small band gap of 0.15 eV at K point. The intrinsic properties of graphene such as linear dispersion of electronic bands near the K point and high carrier mobility are retained in the graphene with BC3 substrate. The dielectric function of graphene with BC3 substrate can be considered as the superposition of dielectric function of graphene and BC3 monolayer where the interaction between graphene and monolayer BC3 leads to the shift of peak positions. These results can be used in designing new opto-electronic devices such as field effect transistors.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
21
27
http://jrmbs.scu.ac.ir/article_13633_2b16c001ebe7e2f7eea2d8071c580aa1.pdf
dx.doi.org/10.22055/jrmbs.2018.13633
gamma Radiation Spectrum Analysis of Irradiated Fuel at Different Cooling Times and the Best Fuel Burnup and Power Monitors in Tehran Research Reactor
somayeh
bagheri
shiraz university
author
hossein
khalafi
AEOI
author
farshad
faghihi
shiraz university
author
text
article
2018
per
One of the non-destructive methods in evaluating the characteristics of irradiated fuels in any reactor is the gamma radiation spectroscopy. A qualitative and quantitative analysis of the spectrum of an irradiated fuel and the estimation of some fissile products as a fuel burnup and the power peaking factor monitors in a fuel assembly is necessary. On the other hand, some experimental constraints, including the resolution of the detector energy, prevent the detection of some fission products and hide certain information in the spectrum. Therefore, in this study, the content of fissile fragments of Tehran Research Reactor fuel at different cooling times (3, 30, 120, 360 and 720 days) was evaluated with the ORIGEN2.1 computational code and the spectrum of fission products by Monte Carlo code MCNPX2.7 have been simulated. Then fission products that can be considered as a good monitors of fuel burnup have been analyzed.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
29
39
http://jrmbs.scu.ac.ir/article_13634_6cb78097b366abfe746905dc8043f47f.pdf
dx.doi.org/10.22055/jrmbs.2018.13634
Effects of exchange interaction and single ion-anisotropy on the Hysteresis loop of ferrimagnetic ternary alloys ABxC1-x with amorphous structures
Hamze
Nakhaee Motlagh
دانشگاه یاسوج
author
Ghasem
Rezaei
عضو هیات علمی
author
text
article
2018
per
Based on the Monte Carlo simulation and the RKKY model, magnetic properties of mixed spin (3/2,1,1/2) ferrimagnetic ternary alloys of the type ABxC1-x are investigated. To do this, the influence of exchange energy and single ion-anisotropy on the magnetic hysteresis loop and magnetic susceptibility of ternary alloys with amorphous structures are examined. Our simulations reveal that the changes in exchange energy and single ion-anisotropy have a great influence on the magnetic hysteresis loop. It is seen that for some values of these parameters the stepwise curves and the triple hysteresis loop are appeared. Furthermore, the influence of concentration on the behaviour of thermal magnetization is studied. Our results indicate that for some values of concentration, the compensation temperature becomes less than the phase temperature.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
41
51
http://jrmbs.scu.ac.ir/article_13635_6a53cbda3059397e28ea1d601e70df04.pdf
dx.doi.org/10.22055/jrmbs.2018.13635
Quantum Thermodynamics of an atom-cavity system with Jaynes-Cummings interaction
Morteza
Rafiee
Assistant professor of physics - Shahrood University of Technology.
author
text
article
2018
per
In this paper we give an introduction to the ideas of quantum thermodynamics, using only basic concepts from quantum and statistical mechanics. Then, we discuss the framework of non-equilibrium processes in quantum systems and introduce how to calculate quantities such as work and irreversible entropy in these processes. We then apply these results to the problem of atom-cavity system while their interaction describe by Jaynes-Cummings model with both weak and strong atom-cavity coupling. Here, we introduce the concept of quantum thermodynamics of close quantum system and so by considering a good cavity, coupling of cavity modes with its reservoir has been omitted.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
53
62
http://jrmbs.scu.ac.ir/article_13636_93a1202a0694b3bc37f6494891812b66.pdf
dx.doi.org/10.22055/jrmbs.2018.13636
Analytical investigation of potential structure and neutron production rate in spherical inertial electrostatic confinement fusion devices
mohammad ali
ramzanpour
هیات علمی دانشگاه آزاد اسلامی
author
mohammad reza
pahlavani
هیات علمی
author
text
article
2018
per
The radial profile of potential structure and neutron production rate in spherical inertial electrostatic confinement fusion devices (IECF) using deuterium fuel is investigated. With the introduction of ion and electron distribution functions and numerical solution of Poisson's equation, the potential is determined. Using energy distribution function, calculated fusion reaction rate. The dependence of the potential structure and rate of neutron production on some important parameters as the spreads in the energy and angular momentum, the number of secondary electrons generated from the cathode surface, input power and working pressure is evaluated And is shown with control some of the parameters and variables, can increase the rate of neutron production.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
63
71
http://jrmbs.scu.ac.ir/article_13637_7ca3c15d013232681ba00edf003e91c1.pdf
dx.doi.org/10.22055/jrmbs.2018.13637
Trial wave function approach to calculate the Ground state energy of nonlinear Schrodinger equation in many body physics
Seyed mohammad ali
aleomraninejad
Department of Mathematics, Faculty of Science, Qom University of technology, Qom, Iran
author
mehdi
solaimani
Department of Physics-Faculty of sciences-Qom University of Technology-Qom-Iran
author
text
article
2018
per
In this paper, we have studied some nonlinear Schrodinger equations appeared inmany body systems such as a nanowire with a soft polar layer, a quantum well in the presence of the electron-electron interactions, Grass-Pitaevskii equation for Bose-Einstein condensate in the presence on the two and three body interactions. Calculation of the ground state energy of these systems by analytical methods is very difficult. Solution of these equations through numerical methods like self-consistent one also needs complicated computer programming. In this paper, Ground state energy have been obtained by means of the Euler-Lagrange Variational method as well as simple and appropriate trial wave-functions.Comparison of the result we have obtained with the Varational technique and the available methods in the literatures shows the high accuracy ofthis method.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
73
82
http://jrmbs.scu.ac.ir/article_13638_79fb6bc2e7a9060ff4074e8fb8461549.pdf
dx.doi.org/10.22055/jrmbs.2018.13638
Magnetic transport on topological insulator surface
Ali Asghar
Shokri
Department of Physics, Payame Noor University, Tehran
author
Maryam
Rajabizadeh
1Department of Physics, Tehran Payame-Noor University (PNU), Tehran
author
text
article
2018
per
In this paper, we have investigated the transport properties of the Dirac fermions on a topological insulator surface in the presence of external electric and magnetic fields. For this reason, firstly we obtain the eigen energies (or eigenvalues) by using the Dirac Hamiltonian of the system for transmitted electrons via the surface and the Lorentz transformations. The conductance of the system is calculated by Landauer equation. Also, the effects of electric and magnetic fields are investigated on the conductance and Fano factor effect. The application of the present results may be useful in designing devices based on molecular electronics in nanoscale.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
83
93
http://jrmbs.scu.ac.ir/article_13639_5e75cd65c03afaf0d9e3125603996878.pdf
dx.doi.org/10.22055/jrmbs.2018.13639
Quantum cooling simulation in an Opto-mechanical cavity, using Python
Mahmoud
Sadeghi
Department of Physics, University of Hormozgan, Bandar-e-Abbas
author
Vahid
Ameri
Department of Physics, University of Hormozgan, Bandar-e-Abbas
author
Kamran
Jallabpour
Department of Physics, University of Hormozgan, Bandar-e-Abbas
author
text
article
2018
per
In cavity opto-mechanical cooling, driving laser optical field, exerts extra decay to the mechanical mode of cavity, and cause a return to the ground state. In this study, quantum cooling of an opto-mechanical cavity in contact with a thermal bath, has been simulated by using Quantum Toolbox in Python “QuTiP”. Simulation results show that, the cavity cooling process, takes more time with increasing the decay rate of optical modes and go faster with increasing the decay rate of mechanical modes. Also this process takes less time with the increasing coupling constant of optical and mechanical modes. By adding a qubit to the system, simulation shows that the cooling process could happen faster in compare to the previous.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
95
100
http://jrmbs.scu.ac.ir/article_13640_8322623e819dd9c0ab015aacca563d3f.pdf
dx.doi.org/10.22055/jrmbs.2018.13640
Design and Analysis of Plasmonic Switch at mid-IR Wavelengths with Graphene Nano-Ribbons
Fatemeh
Moradiani
Department of Electronic, Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
author
Mahmood
Seifouri
Dept. of Electronic Eng., Faculty of Electrical Eng., Shahid Rajaee Teacher Training University, Tehran, Iran
author
Kambiz
Abedi
Departement of Electronic, Faculty of Electrical and computer Engineering, Shahid Beheshti University, Tehran, Iran
author
text
article
2018
per
Taking advantage of chemical potential (μ_c) one layer and multi layers graphene nano ribbons, we designed and analyzed performance of plasmonic switches at mid-IR wavelengths. By slight varying the chemical potential of graphene, significant resonance shifts (∆λ) and modulation depth (MD) achieved. Finite element method numerical simulation show that plasmonic switch made of hexagonal boron nitride (hBN)/Graphene suffering relatively large MD and wavelength shifts with N=6, and varying μ_c from 0.3eV- 0.4eV, 14 dB and 2.8 µm, respectively. The proposed structure could be useful for research in compact and largely tunable mid-infrared photonic devices to realize on-chip CMOS optoelectronic systems.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
101
105
http://jrmbs.scu.ac.ir/article_13641_9ddd639b6c807cf76dc1df4480b146a8.pdf
dx.doi.org/10.22055/jrmbs.2018.13641
Propagation of electrostatic drift waves in nonuniform and nonideal quantum magnetoplasma
ahmad
mehramiz
Imam Khomeini International University
author
Babak
Mohammadhoseini
Physics Dep. Imam Khomeini International University, Qazvin. Iran
author
Elham
Shabansoleimani
Physics Dep. Imam Khomeini International University, Qazvin. Iran
author
text
article
2018
per
Abstract In this work, the propagation of the electrostatic drift waves is studied in a non-uniform quantum plasma medium. The analytical expression for dispersion relation of the waves is derived by taking into account the resistivity and quantum aspects of the medium. It has been shown that the quantum effects, alter the dispersion relation of the drift modes. The result is the appearance of modified electron diamagnetic drift waves as well as ion acoustic waves. Furthermore, the velocities of these waves are greater than their classical case. The graphical analysis also revealed that the quantum corrections cause electron branch of the drift waves to become propagative. In the presence of resistivity, the electron drift wave is always unstable, whereas the ion branch of the drift wave becomes damped. On the other hand, in the absence of quantum aspects and given zero resistivity, the two generated ion acoustic and electron drift waves are completely stable.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
107
114
http://jrmbs.scu.ac.ir/article_13642_3144f04c48df81768d589390ee640d08.pdf
dx.doi.org/10.22055/jrmbs.2018.13642
Effect of quantum forces on the electromagnetic ion waves in a spin quantum plasma
Hossein
Lotfi Gogarchin
Physics Department, Factually of science, Imam Khomeini International University, Qazvin
author
ahmad
mehramiz
Imam Khomeini International University
author
text
article
2018
per
In this work, the behavior of electromagnetic ion waves in a warm plasma considering the quantum forces related to the electron spin and the quantum diffraction effects of all plasma particles is investigated. The results show that the quantum correction associated with the quantum potential of ions and electrons has a significant effect on the dispersion of waves and introduces non-linear terms in the dispersion relation. We also find that the spin of electrons contributes to the linear part of the dispersion relation via modification of the Alfven velocity. Moreover, the spin effect of electron decreases the contribution of quantum potential on the dispersion of wave modes. Finally, some special cases in classical and quantum regimes are discussed.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
115
122
http://jrmbs.scu.ac.ir/article_13643_57361310a770f87310e9423a35988bd0.pdf
dx.doi.org/10.22055/jrmbs.2018.13643
Long-Range Statistical Correlations in Human Language: A Case Study in Persian Language
Ali
Mehri
Noshirvani University of Technology
author
text
article
2018
per
Complex structure of human language enables us to exchange very complicated information. This communication system obeys some common nonlinear statistical regularities. We investigate four important statistical features of Persian language. We perform our calculations for adopted works of six famous Persian litterateurs. Zipf’s law and Heaps’ law, which imply well-known power-law behaviors, are established in this language, showing a qualitative inverse relation with each other. Furthermore, the informational content associated with the words ordering, is measured by using an entropic metric. This metric can be applied in words relevancy ranking process. We also calculate fractal dimension of words in the text by using box counting method. The fractal dimension of each word, that is a positive value less than or equal to one, exhibits its spatial distribution in the text. Generally, we can claim that the Persian language follows the mentioned statistical laws, like the other languages studied in previous works.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
123
133
http://jrmbs.scu.ac.ir/article_13644_ff782af709c0b1b707ecfd682fe2c714.pdf
dx.doi.org/10.22055/jrmbs.2018.13644
Asymptotic-de Sitter Modes for Early Universe Inflation
Ebrahim
Yusofi
عضو هیات علمی
author
مجید
محسن زاده گنجی
معاونت دانشجویی و فرهنگی
عضو هیات علمی
author
text
article
2018
per
The recent data from observational Planck data about inflation indicate that our universe was nearly de Sitter space-time in the early times which results in an approximate scale-invariant spectrum. These observational data from scalar spectral index and curved space-time symmetry condition stimulate us to use quasi-de Sitter modes during inflation. To obtain the alternative modes, for first time, we consider the asymptotic expansion of the Hankel functions up to the higher order of 1⁄kτ . In this paper, we review the results due to selection of the generalized form of the asymptotic de Sitter inflationary modes, such as higher order corrections of power spectrum and particle creation, trans-Planckian corrections, equation of state, and non-minimal coupling inflation. These results are general and in flat and de Sitter limit confirm the conventional results. Finally, to reconstruction of the modes we fit the power spectrum of temperature anisotropies for model with ΛCDM model and Planck data.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
8
v.
16
no.
2018
135
141
http://jrmbs.scu.ac.ir/article_13646_deeda9c2039bb07addac8b35aa8f2ca9.pdf
dx.doi.org/10.22055/jrmbs.2018.13646