absorbers, optical sensing devices, and flexible electronics.  

   In this thesis, we intend the the electronic properties of boron - phosphide monolayer under applying perpendicular electric and magnetic fields. We study the beharier of electronic density of states of the thestruclure and temperature beharier of tra  ort preperties such as electrical and thermal conduetivities. We have found the results based on Green's function and many body approaches. Tight binding model in the presence of bias voltage and Zeeman effects due to external magnetic field has been applied to study electron dynamics. Using electronic band structure in the context of Green's function and linear respense theory, the mentioued physical preperties have been analysed. Moreover, the effects of electric and megnetic fields intensities and electron doping on the temperature behavior of conductivities and density of states of states have been investigated.

 This doctoral dissertation investigates the ?-decay chains and decay mode predictions of the superheavy nuclei with proton numbers Z=118-124. The ?-decay half-lives were systematically calculated using several semi-empirical relations, including the Denisov–Khudenko, Royer, Horoi, the Universal Decay Law (UDL), the Universal curve (UNIV), and the Viola–Seaborg–Sobiczewski (VSS) formulas, in addition to the Wentzel–Kramers–Brillouin (WKB) approximation combined with the Bohr–Sommerfeld quantization condition. For spontaneous fission (SF), two distinct approaches were employed: The Bao et al. formulation, which incorporates shell corrections and nucleon blocking effects, and the Soylu relation, derived from the liquid-drop model framework.The predictive accuracy of the models was evaluated through a root-mean-square (rms) comparison with available experimental data on known superheavy isotopes. The results demonstrate that among the different approaches, the WKB approximation and Royer’s analytical formula yield the best agreement with experimental observations. In contrast, significant discrepancies were found between the spontaneous fission half-lives predicted by the Bao and Soylu models, highlighting the sensitivity of SF calculations to model-dependent parameters such as shell corrections and isospin effects.The analysis reveals multiple possible ?-decay chains for isotopes of Z=118-124, some of which are terminated by spontaneous fission, depending on the relative dominance of the competing decay modes. These findings not only confirm trends reported in earlier studies but also extend the predictive framework for identifying potentially long-lived isotopes suitable for future synthesis attempts.Overall, this research provides a comprehensive theoretical framework for decay mode predictions beyond the valley of stability, offering valuable insights that may guide forthcoming experimental efforts aimed at producing and characterizing new superheavy elements.

In this thesis, the optical response of quantum dot molecules without and with the presence of metal nanoparticles has been studied. Using the density matrix formalism, the system's behavior is analyzed, and the governing equations of the quantum system are solved in the steady state. By solving the dynamic equations of the system, the linear and nonlinear optical responses have been investigated by calculating the first- and third-order susceptibilities, and the two-photon absorption cross section of quantum dot molecules has been determined. In addition, the phenomenon of induced tra  arency resulting from electron (hole) tunneling between quantum dots in quantum dot molecules has been studied, and the effect of physical parameters such as the tunneling intensity, the energy difference between the energy levels, and the distance between the quantum dot and the metal nanoparticle in a quantum dot molecule system has been investigated. The results obtained can be useful in improving the control of optical properties and designing nanophotonic and optoelectronic structures.

  Electromagnetic waves consist of two components, electric and magnetic, so it is necessary that composite coatings absorbing electromagnetic waves have simultaneous magnetic and electric absorption. The electromagnetic properties of magnetic nanoparticles are different from their aggregated state due to surface effects. Because the particles are close to each other, there will be a possibility of dipole-dipole interactions between them, which usually causes magnetic particles to aggregate. These interactions can have a negative impact on their use in electromagnetic wave absorbers. Therefore, to reduce these interactions, the particles can usually be coated with various non-magnetic compounds. Cobalt ferrite is a hard magnetic material with an inverted spinel structure, has properties of magnetic anisotropy, saturation magnetization (MS) and high coercivity (HC), mechanical hardness and high chemical stability, which is used for magnetization loss in this thesis, and activated carbon and carbon nanotubes are also used for dielectric loss in this thesis, and the role of PVA is to stabilize nanoparticles in the composition, which prevents their agglomeration and clumping. In this thesis, cobalt ferrite nanorods and carbon nanotubes are immobilized in the pores of activated carbon by PVA using a sol-gel method, forming a new compound called polyvinyl alcohol/cobalt ferrite/carbon nanotube/activated carbon. These materials are measured by scanning electron microscopy (SEM) and X-ray diffraction (XRD), visible-ultraviolet spectroscopy, LCR meter, and analyzed by cyclic voltammetry (CV) and electrochemical charge/discharge (GCD).

Abstract Transition metal sulfides (TMDs) possess exceptional dielectric properties and a narrow band gap, rendering them highly efficient as electromagnetic absorbing materials. Among these TMDs, the two-dimensional MoS2 nanosheet has received significant attention in research. However, the quest for new absorbers no longer finds satisfaction in solitary absorption mechanisms. This article introduces a successful method for creating PVA/NiFe2O4/(MoS2)x nanocomposites via a straightforward sol-gel technique, wherein porous amorphous NiFe2O4 microspheres are integrated into MoS2 nanosheets. The investigation uncovers that the incorporation of MoS2 results in an enhanced complex permittivity, facilitating the attainment of a desirable permittivity level. The PVA/NiFe2O4/(MoS2)x nanocomposites absorber exhibits an incredibly low reflection loss (RL) of -16.75 dB at a mere thickness of 1 mm, achieved through the cooperative interaction of dielectric and magnetic loss, along with the advantages of the structure and composition. Consequently, the PVA/NiFe2O4/(MoS2)x nanocomposites effectively absorb electromagnetic waves. Therefore, it is posited that MoS2-based composites hold great promise as highly effective microwave absorbers, boasting strong absorption intensity and a wide absorption frequency range, given the exceptional performance of the as-fabricated PVA/NiFe2O4/(MoS2)x nanocomposites.  

Abstract The presence of electromagnetic pollution not only poses a threat to human health but also disrupts the proper functioning of large-scale machinery. In light of this,a novel method involving sol-gel technique   was utilized to synthesize PVA/Mn Ferrite/(MoS2)x nanocomposites, which exhibit remarkable electromagnetic wave absorption roperties. By intelligently combining MoS2 with PVA/Mn Ferrite, the composite's electromagnetic parameters were optimized, leading to enhanced impedance matching. A   a   result,   the PVA/Mn Ferrite/(MoS2)x nanocomposites showcased an exceptional minimum reflection loss of -15.971dB at a thickness of 1 mm.The remarkable capability of absorbing substances can primarily be attributed to the outstanding synergistic interaction between PVA/Mn Ferrite and MoS2. Additionally, MoS2 also plays a significant role in generating dielectric loss and achieving ideal impedance matching. As a result, the potential applications of PVA/Mn Ferrite/(MoS2)x nanocomposites extend to serving as both absorption materials and light dependent resistance (LDR) sensors. These nanocomposites exhibit not only high efficiency but also possess the added advantages of flexibility and lightweight properties, further enhancing their desirability. Keywords: Absorbing material, Electrical and magnetic properties, Impedance matching, LDR sensor   

  Investigating the magnetic, electrical and structural behaviors of Au/MoS2@(NiFe2O4)x nanostructures as electromagnetic absorbers

  Carbon is one of the most important and interesting

Two-dimensional T-graphene is one of the allotropes of carbon, which is made of carbon tetragonal and octagonal rings alternately, and it is expected to have distinctive and interesting properties due to its different band structure compared to graphene. The electronic properties of nanostructures are a function of their geometry and type of atoms. In this thesis, an attempt is made to investigate the electronic properties of zigzag and armchair T-graphene nanotubes with different diameters. The theoretical approaches used are tight-binding approximation, nearest neighbor approximation and Green's function approach. For this purpose, we first write the Hamiltonian of the studied nanostructures in the tight-binding approximation and the second quantization for Bloch electrons without interaction, and then we obtain the equation of motion of the valence electrons of the considered system. In the next step, using the obtained Green's function, the density of energy states and band structure are calculated, and at the end, the graphs of band structure and density of energy states for zigzag and armchair T-graphene nanotubes has been drawn using coding in MATLAB programming language and we analyze the resulting graphs  

 Geophysical methods are one of the indirect methods for exploration that are widely used in the field of searching and exploring subsurface resources

ما در اين پژوهش يك روش براي تخمين جهت بردار مغناطيسي بي هنجاري هاي مغناطيسي ارائه ميدهيم.در واقع هدف از تفسير بي هنجاري هاي مغناطيسي ، تعيين موقعيت منابع مغناطيسي است كه باعث پديد آمدن بي هنجاري هايي در ميدان مغناطيسي زمين ميشوند.در نظر گرفتن اين واقعيت كه شكل جانبي و مكان قرار گرفتن بي هنجاري هاي مغناطيسي،نه تنها به مكان و شكل عاملان بي هنجاري ، بلكه به ميدان مغناطيسي زمين و بردار مغناطش منبع مغناطيسي وابسته ميباشد،رسيدن به اين هدف را براي ما دشوار ميكند.روشي كه ما در اين پژوهش براي تخمين جهت مغناطش ارائه ميدهيم مبتني بر داده هاي حاصل از تانسور گراديان مغناطيسي و يكي از تبديل هاي ميدان مغناطيسي بنام تبديل انتقال به قطب است.داده اي كه از تانسور گراديان مغناطيسي حاصل ميشود با نام شدت منبع به هنجار شده شناخته ميشود كه داراي كمترين ميزان وابستگي به بردار مغناطش است.در حالي كه روش هاي رايج مانند بي هنجاري شدت كل ميدان مغناطيسي تا حد قابل توجهي به جهت مغناطش وابسته هستند. اين ويژگي شدت منبع به هنجار شده را به يك پارامتر قابل اطمينان جهت محاسبات مغناطيسي تبديل كرده است.لازم به ذكر است كه شدت منبع به هنجار شده نتايج دقيقي را از مكان منبع مغناطيسي به نمايش ميگذارد.از طرفي فيلتر انتقال به قطب به جهت مغناطش وابسته ميباشد و هنگامي كه جهت هاي صحيح از بردار مغناطش را براي آن استفاده كنيم، بر مكان منبع مغناطيسي متمركز خواهد شد.ما از همبستگي بين داده هاي شدت منبع به هنجار شده و انتقال به قطب براي يافتن جهت مغناطش منبع مورد نظر استفاده ميكنيم.براي يك زاويه ي انحراف و يك زاويه ي ميل،ضريب همبستگي بيشترين مقدار را دارا ميباشد كه آن را به عنوان جهت مغناطش صحيح بي هنجاري مغناطيسي در نظر ميگيريم.ما روش پيشنهادي را براي مدل هاي مغناطيسي مصنوعي ايزوله و متداخل بكار برديم و ميزان خطا را در هر يك از موارد مورد بررسي قرار داديم.و مقايسه اي هر چند اجمالي از شدت منبع به هنجار شده و اندازه ي ميدان كل   بر روي داده هاي حاصل شده به عمل آورديم.و كارايي شدت منبع به هنجار شده و دقت آن را در جهت تعيين مغناطش بي هنجاري به اثبات رسانديم.  

   In today's world, the need for flexible, light, small and at the same time energy storage devices with high energy storage density for use in the manufacture and design of electronic devices is very much felt. Preparing capacitors in the shortest possible time with high energy storage capacity based on cheap and environmentally friendly materials is one of the challenges of today's human progress in using energy storage tools. Therefore, in this thesis, the design and construction of flexible microsupercapacitor based on the active materials of graphene nanocomposites was put on the agenda. In this research, by emphasizing the use of environmentally friendly materials and in the shortest possible time, a tool is designed and built to store as much energy as possible in small and portable dimensions. The morphology of the surface and the crystal structure of the manufactured electrodes are evaluated by different analyses. Also, the capacity and energy density of the prepared microsupercapacitor is investigated by electrochemical analysis. In this research, by making two different electrodes, RGO and RGO/CuO, and examining the electrochemical characteristics of each, we achieved a compatible and useful material for increasing energy density and power density. By performing cyclic voltammetry on these two electrode materials, we obtained a capacity of 2.73 mF.cm-2 and 9.02 mF.cm-2 at a scan rate of 10 mV.s-1 for RGO and RGO/CuO electrodes. The capacity of the composite supercapacitor after 1000 cycles has been maintained at 87%, which is an acceptable number compared to valid articles.   

   In order to realize low cost and high-performance energy storage, it is very important to develop a doped cathode material for high capacity and long cycle lithium ion batteries. LiMn1.977(Ce, Cu, Ti, CeCuTi)0.023O4 nanoparticles are considered a promising cathode material due to incomparable high structural stability, high capacity and safety during the charge/discharge cycles. Here we report on the LiMn2O4 cathode doped with Ce, Cu, Ti, CeCuTi and CNT contamination. Among the pure LiMn2O4 and different doped LiMn2O4 samples, the Ti-doped LiMn2O4 cathode calcined at 700 ?C shows the highest capacity of 144.701 mAh.g-1 after 20 cycles with a high current density of 0.1 C which reaches 186.413 mAh.g-1with CNT doping (capacity retention=98.924 %). This is due to the small size of the Ti atom, resulting in high porosity for reversible storage of lithium, and also the presence of titanium in the lattice increases the dielectric constant. This study provides a reliable and easy way to fabricate and analyze LiMn1.977(Ce, Cu, Ti, CeCuTi)0.023O4 nanoparticle-based cathodes with excellent performance.

In this thesis, we have intended, to study the frequency behavior of electromagnetic wave absorption of armchair nanoribbon. for describing of the electron dynamics, we have exploited the Hubbard model Hamiltonian. In fact the electronic band structure has been obtained using Hubbard model Hamiltonian. In this model Hamiltonian, a repulsive coulomb interaction between electrons is considered in addition to kinetic energy and attractive coulomb interaction between electrons and atoms. Based on mean field approximation method, one can obtain electronic energy levels in this structure and by using that the behavior of density of states has been analysed. kubo formulation has been used for expressing electromagnetic wave absorption rate in terms of correlation function between current operatous. Finally, the relation of electromagnetic wave absorption is obtained based on band structure spectrum, after required numerical calculation, one can find the numerical values dependence of absorption spectrum in terms of waves. In the following we have studied the effects of electron?electron interaction on the electromagnetic wave absorption behavior in terms of frequency. Also the effect of nanoribbon width and electron concentration on frequency peaks of electromagnetic spectrum by the armchair nanoribbon has been investigated.

   In this thesis we intend to investigate the optical absorption of bilayer   graphene with both simple and bernal stacking due to Hubbard model. the effects of electronic concentration and electronic interaction strength on optical absorption behavior have been analyzed. also bias voltage as an electric field perpendicular to the plane has bee   applied.   firstly density of states behavior has been studied and frequency behavior of electromagnetic absorption rate by bilayer   graphene based on electronic Green’s function is addressed.   Moreover, the Drude weight situation on frequency behavior of optical absorption is investigated. the effects of stacking type and electronic concentration on frequency behavior optical absorption are studied. firstly the situation of finite frequency peak of optical absorption curves service and variation of position and highest of peaks due to bias voltage, electronic concentration and electronic interaction has bee   discussed.

Abstract Compared to other geophysical data on Earth, the information collected about the Earth's magnetic field is relatively large. Since more knowledge of the Earth's geomagnetic field can pave the way for other studies on the Earth's magnetism and the development of geophysical methods, In this study, we intend to analyze the contribution of solar cycles in secular variation of the geomagnetic field for the years 1960 to 2015. The sun's magnetic field changes with different cycles. One of these cycles, cycle of 11yearly changes. To investigate the possible impact of these changes on the Earth's geomagnetic field, First We have collected the annual average of the North component (X), East component (Y) and Downward component (Z) of the Earth's magnetic field from the site of the British Geological Survey(BGS) , which run by the University of Nottingham, from 1960 to 2015 for 27 reference observatories. To extract the 11-year changes, we first filtered the data using a band-pass filter, this filter significantly reduces the range of changes shorter than six years while maintaining 11-year changes. Then we filtered the output data of the first filter by High pass filter, the feature of this filter is that it leaves 11-year changes almost unchanged, but reduces the range of changes with a period of more than 11 years by applying coefficients. Comparison of drawn diagrams with a graph of the number of su  ots, Shows when reducing the number of su  ots due to the decrease in the magnetic activity of the sun and its effect on the Earth's magnetosphere and consequently, the increase of the Earth's magnetic field, graphs of the components of the Earth's geomagnetic field show relative maxima and vice versa when the number of these spots increases on the surface of the sun, due to the onset of magnetic storms and the increasing pressure of the sun's magnetic field on the magnetosphere, and resulting in a decrease in the Earth's magnetic field, relative minima are seen in the graphs. The results of calculating the correlation coefficients for the components of the geomagnetic field (corresponding to the data of 55 observatories between 1960 and 2015) In Excel, it confirms that the number of su  ots has an inverse relationship with an intensity close to negative one with the output components of the two filters. Therefore, the 11-year changes in the Earth's magnetic field could be due to the 11-year changes in the Sun's magnetic field.   

ABSTRACT (Silicene)is the two - dimensional silicon with a structure like graphene. Silicene is a two - dimensional honeycomb - free network of silicon atoms with a bend of the plane which causes the subnet to be positioned in two parallel planes that are perpendicular to each other. That is, the shape is not quite flat and the corner of the hexagon is upside down and down. Moreover, when silicon atoms are formed in two dimensions, they are subjected to stress and are not as stable as carbon. Since Silicene is unstable, it should be protected from it, which makes it difficult to manipulate and work with. The structure of the material brings the ideal electrical characteristics to it in this thesis, we studied the Silicene structure of electron tra  ort properties with injection of carbon impurities and without them. the structural and structural properties of Silicene are studied using the WIEN2K computational code within the framework of the density function. For functional energy function, the correlation is used to approximate the gradient approximation (GGA). density curves and band structure are plotted in each case. our calculations show that pure سيليسين has metallic properties, and with the injection of   oron impurities and carbon Silicene, the semi condouctor property with gap is about 0.143   

  AbstractObjective: The most effective way to summarize what we know about a complex system is to identify the potential impact effects of the interaction on that system, so it is essential to examine the potential effects of the interaction in real systems. On the other hand, in the last few decades, we have witnessed a revolution in the world that has been made by science and technology in connection with two-dimensional, one-dimensional and zero-dimensional nanostructured materials. The main context of the attractive and valuable phenomena of quantum structures is quantum confinement and confinement, and therefore research on the origin and effect of confinement in quantum dots has become one of the most basic and exciting introductory fields in modern science. The aim of this study is to study meson systems in quantum dots.Research Methodology: This research is fundamental in terms of type. Due to the confinement of a quark  under the potential of , along with a suitable boundary condition, the corresponding Schrodinger equation is obtained by approximating the effective mass (EMA). For the basic state, the solution and the energy of the base state, the wave function and the probability of the quark probability are obtained. Due to the similarity of mesonic systems to electron-hole system  and also due to the choice of potential parameter approach that has flexibility, this information is compared with quantum dots consisting of electrons and holes.Results: From the phenomenological analysis, it was observed that the assumption for the effective potential of , with a certain range of values "??

   So far a lot of   theoretical and experimental researchs on different two-dimensional monolayers in order to assess their structural stability, electronic properties and application in electronic devices.Nanostructures are materials with nanometer size, different physical, chemical, mechanical and… properties in comparison bulk of them.In material, with nanostructure size, the area atoms ratio to volume atoms is very bigger than bulk case. Also in these structures there are quantum confinement effects and there for properties of them are different from bulk materials.In this work, under the generalized gradient approximation (GGA), the structural and electronic properties of germanene with and without impurity by using the first-principles projector-augmented wave (FP-LAPW) potential within the density functiontheory (DFT) framework.   

Over the past several years, attention has been focused on Alternating crystal structures of various materials in physics and photonics. In this study, first the Alternating crystal structures (or photonic crystal) is introduced and the laws that is controlling the transmission of electromagnetic waves through the photonic crystal and the transfer matrix method are studied. Then the relationship of the transfer coefficient of the electromagnetic wave through the crystal layers is estimated and different structures of the dielectric layer alternation is studied. In order to improve the transfer coefficient of wave through the photon crystal and reduce the band gap energy, a metal nanoparticles composite and graphene layer is introduced and added to the structure and the results are studied. The results of the theoretical calculations that was performed in this study represente that the addition of a metal nanoparticles composite and the use of graphene monolayers in one-dimensional photonic crystal structure causes the destroy of band gap energy in the transmitted spectrum of the structure. This result can be used in the manufacture of photonic devices over a wide frequency range.

    In this thesis, using the Green’s functions approach and Harrison’s tight-binding Hamiltonian model, we want to study the electronic identity and electronic heat capacity of the black and blue phosphorenes being compared with graphene. The results show that both kinds of phosphorenes are semiconductor. Observed in both is the Schottky anomaly at thermal provocations near the energy gap. Furthermore, employing the Harrison’s model for blue phosphorene provides more details for analisis of partial contribution of the various atomic orbitals.

 investigation

بررسي ويژگي هاي الكترونيكي پليمرها

study magnetic susceptibility of bhlaer graphen nanoribbon up to second neighbor approximation

  By the density functional theory whit augmented plane wave and generalized gradient approximation, the electronic and magnetic properties of SiB zigzag hydrogenated nanoribbons whit different widths have investigated. The results showed that all of the nanoribbons have metallic behavior. Also the systems did not have any magnetic property.

  The electronic and magnetic properties of the hydrogenated zigzag GaN nanoribbons with different widthes 3, 5, 7, 9, have been stadied. The methode of the study was density functional theory with full potential and   augmented plane wave approach. And the Generalized gradient approximation, GGA, are used for exchange- correlation functional. The curves of density of states and electronic density of the nanoribbons were drown. The results show all of the nanoribbons have semiconductor behaviour, The value of the gap energy of the nanoribbons are from 2.687 eV to 2.008 eV. With increase the width of the nanoribbon, the band gap of it is decreased. Also all of the nanoribbons don?t have any magnetic property.

برداشت داده در منطقه طبس انجام شد. سپس با استفاده از نرم افزار ژئوسافت، صافي هايي بر روي اين داده ها اعمال شد و نتايج آن به شكل نقشه ترسيم شد. پس از ترسيم نقشه ، با نقشه زمين شناسي منطقه مطابقت داده شد. در آخر محل نسبي بي هنجاري مشخص شد.

  CdTe and ZnTe monolayer crystals in bulk and stability of the structure Almasyand properties band gap semiconductor with ev 5/1 (CdTe) = and ev26 / 2 = (ZnTe) are. HgTe in bulk crystalline diamond-like metal structure with zero energy band gap semiconductor layer in single mode, with different properties than the bulk of it. The material in the manufacture of hard x-ray detectors and radiation ? many applications. Restructuring in the future with other materials such as CdTe or Hg, and Zn for entering an infrared detector and energetic particles, which referred astronomical use of the materials used. The subject of this thesis study Structural and electronic properties and other properties of the compound using density functional theory and application of augmented plane wave with code Vienna.

  Silicon carbide (SiC), also known as carborundum is a compound of silicon and carbon with chemical formula SiC. In 1893, Henri Moissan discovered the very rare naturally-occurring SiC mineral. Moissan also synthesized SiC by several routes, including dissolution of carbon in molten silicon, melting a mixture of calcium carbide and silica, and by reducing silica with carbon in an electric furnace. The first use of SiC was as an abrasive. This was followed by electronic applications. In 1907 Henry Joseph Round produced the first LED by applying a voltage to a SiC crystal and observing yellow, green and orange emission at the cathode   Under the generalized gradient approximation (GGA), the electronic properties are studied for Sic nanoribbon armchair edge (ASiCNR) by using the first-principles projector-augmented wave (PAW) potential within the density function theory (DFT) framework. The results show that the H-terminated ASiCNRs are always semiconductors independent of their width but the edge states do not appear at the Fermi level, due to the Si-C dimer bonds at the edges.     Silicon carbide (SiC), also known as carborundum is a compound of silicon and carbon with chemical formula SiC. In 1893, Henri Moissan discovered the very rare naturally-occurring SiC mineral. Moissan also synthesized SiC by several routes, including dissolution of carbon in molten silicon, melting a mixture of calcium carbide and silica, and by reducing silica with carbon in an electric furnace. The first use of SiC was as an abrasive. This was followed by electronic applications. In 1907 Henry Joseph Round produced the first LED by applying a voltage to a SiC crystal and observing yellow, green and orange emission at the cathode  

In this thesis,we intend to study the coupling exchange constant between two localized spin moments. To do so,one should find static magnetic susceptibility of electron gas in nanoribbon lattice. Based on the linear response theory, RKKY interaction can be obtained via static longitudinal spin susceptibility of Boron-Nitride nanoribbon. Then the effects of spin polarization of armchair Boron-Nitride nanoribbon on the spatial behavior of RKKY in teraction are addressed.Also the distance depandence of RKKY interaction is investigated due to electron doping. Finally the effects of gap parameter, ribbon width and temperature on the spatial dependence of RKKY interaction are focused.

In this thesis,we address the behavior of coupling exchange constant between two localized moments in monolayer gapped graphene like structure as a function of distance.The effects of various factors such as temperature, electronic concentration, gap parameter and spin polarization on the coupling strength have been studied. Based on RKKY theory, the intensity of this interaction is proportional to static spin susceptibility of electron gas. Therefore, the aim of this work is the calculation of magnetic spin susceptibility of electron gas in gapped graphene structure.The effect of magnetic ordering arises from spin dependent chemical potential. By using band structure and chemical potential, the spatial Fourier transformation of static spin susceptibility leads to spatial behavior of RKKY interaction in the gapped graphene structure. Moreover the calculation of both longitudinal and transverse susceptibility makes the effects of anisotropy on the coupling exchange constant.