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The two-dimensional, transition metals dichalcogenides (TMDC) layers with straight band gaps have created a new horizon in the use of these materials in photonics and electroptics. In this paper, the effects of the thin layer and the effects of the spacer have been investigated. The optical properties of structures are investigated by the transfer matrix method, TMM, in the visible wavelength region. By looking at the optical features of the structure with spacer the absorption increases. We have been able to achieve an absorption above 99% with thickness of plasmonic layer 75 nm and thickness of spacer 33 nm for MoS₂ and 40 nm for MoSe_2.

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In this paper the occurrence of interference resonances and their different behavior at even or odd multiples of photon are studied by using symmetric laser fields that are strongly coupled with two energy levels of a four-level system. For doing this work, a model is presented based on crossing points of levels where transitions are created. At first multiphoton resonances in the two-level and three-level systems are investigeted briefly and compared with each other through calculating of interference phase, then the strong dephasing regime for a four-level system is introduced and the levels are become time-dependent, in this way, the transition rates of second order and fourth order that have resonant features for integer n (photon number) are calculated. The calculations display asymmetry of resonances at multiples of even or odd is insensitive to fluctuations of the strongly driven levels, and survives into the strong dephasing regime. We investigate the detuning dependence of current steady-state and its complete agreement with the experiments which are done based on calculating current in spin-blockaded conditions via the levels modeling a double quantum dot and by using numerical simulation. Finally, we show the obtained results have the main features of the experimental data.

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In this paper, we examine how to receive data recorded by the TESS Space Telescope, process the data, and extract the physical parameters of the planets from them. Today, the most widely used and successful technique for finding exoplanets is the transit method, which is used in this article to study the companion planet of HD 202772A star. By obtaining the light curve and validation data of HD 202772A through the MAST database and using the BLS method, which is the most common method for extracting and determining the transit parameters of the exoplanets from the light curve, the orbital period, the transit depth and the transit duration of the planet was extended 3.3 days, 0.003 and 0.2 day were determined, respectively. Also, the radius of the parent star, which is used to calculate the depth and therefore the radius of the planet, is selected from the TICv8 catalog. Finally, the radius of the target planet 1.38458962 Jupiter radius was obtained, which is a relatively good match with the quantities reported by Wang et al. 2018.

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The electric quadrupole transition probabilities of ^98-104Ru isotopic chain are investigated in the both shell and interacting boson models frameworks. The OXBASH code for shell model and the SU(1,1)-affine infinite  dimensional algebra for interacting boson model are used to determine the quadrupole transition rates. Also, the dependence of calculation accuracy and the effective charges to quadrupole deformation and experimental half-lives are considered and the quadrupole moments are computed for these nuclei. The shell model make exact results for such nuclei which are located near the closed shell and also verified the existence of closed sub-shell at N=58 neutron number. On the other hand, the interacting boson model make more exact results for nuclei which have signatures of deformation and also the quadrupole intra-band transition rates. The results suggest a shape coexistence in the ¹⁰²Ru nucleus.

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 "Algebraic cluster model" (ACM) is used to describe the relative motion of the cluster by considering vibrational and rotational degrees of freedom.In this research, using the two-body ACM Hamiltonian, the quantum phase transition in the transition region U(3)↔O(4) for odd nuclear structures such as: ⁸Be،⁹B، ⁹Be, and ¹⁰B has been investigated. The energy surfaces, the expectation value of the boson number operator as a function of the control parameters of the calculated Hamiltonian, and also the effect of pairing the odd nucleon with the even-even boson nucleus at the critical point are discussed.   Experimental data confirm the numerical results.