Journal of Theoretical and Applied Physics (JTAP) Time dependency of the spin-orbit interaction and magnetic field in the long-range Ising model Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Time dependency of the spin-orbit interaction and magnetic field in the long-range Ising model 10.57647/J.JTAP.2023.1703.35 EN Mohammad Reza Soltani Department of Physics, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran Maryam Mahmoudi Department of physics, Guilan University, Rasht, Iran 0000-0001-7354-0225 Abolfazl Hosseini Department of communication, Research Center for Developing Advanced Technologies of Electrical and Electronics Industry, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran Journal Article 2023 11 17 In this study, we have investigated a two-spin Ising model with added Dzyaloshinskii-Moriya (DM) interaction in an external magnetic field. We have considered two different initial states of the system and surveyed the time evolution of entanglement of the system for different parameters such as exchange coefficient, DM coefficient, and magnetic field. The Ising interaction has been considered as a function of distance between two spins. Moreover, both external magnetic field and DM interaction have been considered as a function of time. Under the time-dependent magnetic field and DM interaction, the entanglement of the two-spin system with long-range Ising model present the different dynamic behavior. This effect is strongly dependent on the initial state of the system.

Journal of Theoretical and Applied Physics (JTAP) Theoretical modelling of Terahertz acoustic wave generated by a femtosecond laser pulse in a dense plasma having density gradient Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Theoretical modelling of Terahertz acoustic wave generated by a femtosecond laser pulse in a dense plasma having density gradient 10.57647/J.JTAP.2023.1703.34 EN Sandeep Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India Department of Physics, Deen Dayal Upadhyaya College, University of Delhi, New Delhi, India 0000-0003-0772-3984 Hitendra K. Malik Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India 0000-0002-9432-8140 Journal Article 2023 11 17 Near the critical layer, a p-polarized laser that impinges on a dense plasma having density gradient at an angle to the density gradient transforms into a plasma wave. Even after the laser pulse has stopped, the plasma wave survives. The electrons close to the crucial layer are heated by the plasma wave. Increased plasma pressure and the production of ion-acoustic waves at frequencies lower than those of the ion plasma are the results of a sudden increase in plasma electron temperature. It appears to be a mechanism for ion-acoustic waves observed in an experiment (Adak et al. Phys. Rev. Lett. 114 (2015) 115001), where alternatively the plasma wave can excite ion acoustic waves in Terahertz frequency range via the decay instability. In the present work, we have theoretically demonstrated these observations.

Journal of Theoretical and Applied Physics (JTAP) Particle acceleration by three-dimensional asymmetric current sheet Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Particle acceleration by three-dimensional asymmetric current sheet 10.57647/J.JTAP.2023.1703.33 EN Zahra Akbari Faculty of Physics, University of Tabriz, Tabriz, Iran Mahboub Hosseinpour Faculty of Physics, University of Tabriz, Tabriz, Iran 0000-0001-8296-6981 Mohammad ali Mohammadi Faculty of Physics, University of Tabriz, Tabriz, Iran Journal Article 2023 11 17 Magnetic reconnection is known as an essential process to convert stored energy of magnetic field into the kinetic, thermal energy of plasma and the acceleration of charged particles in astrophysical and space plasmas. In this paper, we investigate some features of test particle acceleration during spine reconnection with an asymmetric current sheet. To do so, we study first the acceleration features of a test-particle and then discuss acceleration of a randomly injected population of 10,000 protons in the vicinity of a null point with input parameters for the solar corona. It is shown that protons are accelerated up to tens of keV and even higher kinetic energies, either along the spine axis or on the fan surface along specified lines. Also, we discuss the variation of energy spectra for different strengths of the electric and magnetic field amplitudes.

Journal of Theoretical and Applied Physics (JTAP) Bohm sheath criterion for electronegative warm plasma carrying seconadary electron emission in an oblique magnetic field Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Bohm sheath criterion for electronegative warm plasma carrying seconadary electron emission in an oblique magnetic field 10.57647/J.JTAP.2023.1703.32 EN Yetendra Prasad Jha Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India Mayank Kumar Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India Hitendra K. Malik Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India 0000-0002-9432-8140 Journal Article 2023 11 17 The Bohm sheath criterion is formulated by using Sagdeev potential approach for electronegative warm plasma under oblique magnetic field and secondary electron emission from the wall. In this model the effect of collisions between positive ions and neutral, ionization, electronegativity, non-extensivity and temperature ratio (positive/negative ion to electron) are also considered to get the exact behavior of velocity of positive ions at the edge of the sheath. Results are compared with the cases of collision-less, ionization-less and absence of electron emission from the wall and it is found that the Bohm velocity for this case is decreased faster with the increase of non-extensivity and the angle of inclination of the applied magnetic field. Also, Bohm velocity gets increased when the electric field at the edge of the sheath increases. Although Bohm velocity does not depend on the strength of the magnetic field, but the slope in the electrostatic potential gets increased and the sheath thickness decreased on raising the strength of the magnetic field.

Journal of Theoretical and Applied Physics (JTAP) On optical field driven quantum spin Hall phase in Bi_2Se_3 thin film with magnetic Impurities Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 On optical field driven quantum spin Hall phase in Bi_2Se_3 thin film with magnetic Impurities 10.57647/J.JTAP.2023.1703.31 EN Udai Prakash Tyagi Deshbandhu College, University of Delhi, Kalkaji, New Delhi-110019, India 0000-0003-1944-7526 Partha Sarathi Goswami Deshbandhu College, University of Delhi, Kalkaji, New Delhi-110019, India 0000-0002-3835-5929 Journal Article 2023 11 17 The normal incidence of circularly polarized optical field (POF) of tunable intensity on the topological insulator Bi2Se3 film is shown to give rise to the quantum spin Hall (QSH) effect, in the presence of the magnetic impurities (MI), starting with a low-energy two-dimensional, time-dependent Hamiltonian in the framework of the Floquet theory. The quantized topological number- the Kane–Mele index Z2 for QSH phase- strongly support this topological state.

Journal of Theoretical and Applied Physics (JTAP) Effect of long-rang interactions on the Kosterlitz-Thouless transition Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Effect of long-rang interactions on the Kosterlitz-Thouless transition 10.57647/J.JTAP.2023.1703.30 EN Yazid Benbouzid Physics Department, Ziane Achour University, Djelfa, Algeria Laboratory of Physico-Chemistry of Materials and Environment, Ziane Achour University, Djelfa, Algeria 0000-0002-7662-0789 Slimane Chala Institute of Electrical and Electronic Engineering, M' Hamed Bougara University, Boumerdes, Algeria Laboratory of Metallic and Semiconducting Materials, Mohamed Khider University, Biskra, Algeria Mostefa Maache Physics Department, Ziane Achour University, Djelfa, Algeria Laboratory of Physics of Thin Films and Applications, Mohamed Khider University, Biskra, Algeria Journal Article 2023 11 17 The two-dimensional XY model of continuous spins on a square lattice is studied by Monte Carlo simulations in the nonextensive statistical approach of Tsallis, using the Metropolis algorithm with a transition probability of the nonextensive approach. Energy per spin, magnetization per spin, heat capacity, magnetic susceptibility, Binder cumulant of the magnetization and Binder cumulant of the energy are calculated in a temperature interval between 0.02 and 2 with a step of 0.02, for square lattice sizes considered between 122 and 482, with periodic boundary conditions, and for discrete values of the Tsallis entropic index q used between 0.99 and 0.5. It has been found that the Kosterlitz-Thouless transition is well observed and modified for q=0.99 and 0.9 ; its critical temperature decreases when q decreases. A particular behavior of the system evolution is observed for q=0.8 and 0.7. The absence of phase transitions was confirmed for q ≤ 0.6.

Journal of Theoretical and Applied Physics (JTAP) Dielectric, electro-optical and spectroscopic properties of silver doped zinc oxide-ferroelectric liquid crystal composite system Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Dielectric, electro-optical and spectroscopic properties of silver doped zinc oxide-ferroelectric liquid crystal composite system 10.57647/J.JTAP.2023.1703.29 EN Kaushlendra Agrahari Liquid Crystal Research Lab, Department of Physics, University of Lucknow, Lucknow 226007, India Sanjeev Kumar Trivedi Faculty of Engineering and Technology, Khwaja Moinuddin Chisthi Language University, Lucknow, India Ram Raseele Awasthi Faculty of Engineering and Technology, Khwaja Moinuddin Chisthi Language University, Lucknow, India Vivek Kumar Nautiyal Department of Physics, Chaudhary Charan Singh University, Meerut, India Rakesh Kumar Sonker Department of Physics, Acharya Narendra Dev College, University of Delhi, Delhi, India Rajiv Manohar Liquid Crystal Research Lab, Department of Physics, University of Lucknow, Lucknow 226007, India Journal Article 2023 11 17 In the present study, silver doped zinc oxide nanoparticles (NPs) have been added in the pristine ferroelectric liquid crystal (FLC). The dielectric, electro-optical and spectroscopic properties was investigated of the pristine FLC and FLC-NPs composite system. The dispersion of NPs into the pristine FLC material sturdily influences the various properties of composite system. Due to dispersion of NPs, a rapid increment in the dielectric permittivity and faster switching was observed for the FLC-NPs composite system. Absorbance of the UV light got diminished in the presence of silver doped zinc oxide NPs. Photoluminescence emission of the pristine FLC material has been quenched after the addition of NPs and a red shift was also detected. The possible applications of this investigation have been suggested in the letter.

Journal of Theoretical and Applied Physics (JTAP) Electrical and optical parameter-based numerical simulation of high-performance CdTe, CIGS, and CZTS solar cells Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Electrical and optical parameter-based numerical simulation of high-performance CdTe, CIGS, and CZTS solar cells 10.57647/J.JTAP.2023.1703.28 EN Galib Hashmi Institute of Energy, University of Dhaka, Dhaka, Bangladesh 0000-0003-2047-8354 Md. Shawkot Hossain Department of Electronics and Communication Engineering, Institute of Science and Technology, National University, Dhaka, Bangladesh Masudul Haider Imtiaz Department of Electrical and Computer Engineering, Coulter School of Engineering, Clarkson University NY, USA 0000-0001-5528-482X Journal Article 2023 11 17 The market for thin-film solar cells is gradually increasing and is expected to grow to 27.11 billion dollars by 2030. The most extensively researched thin film technologies based on simulation right now include solar cells made of Cadmium Telluride (CdTe), Copper Indium Gallium Selenide (CIGS), and Copper Zinc Tin Sulfide (CZTS). This work aims to use free software that does accurate simulation using the electrical and optical parameters (absorption coefficients) published in the literature. Moreover, to optimize efficiency, numerical simulation of all the solar cells has been done for different buffer layers (Cadmium Sulfide (CdS), Zinc Sulfide (ZnS)) and transparent conductive oxide (TCO) layers (Aluminum Zinc Oxide (AZO), and Indium Tin Oxide (ITO)). To assess the performance of the solar cells, changes have been made in the thickness of TCO layers and the alteration of doping concentrations of buffer layers and absorber layers. The simulation shows that 0.1 μm is the best TCO thickness. Furthermore, the AZO layer output outperforms the ITO layer in the simulation. It has also been investigated how employing a zinc telluride (ZnTe)-based back-surface reflector (BSR) layer will affect the results. This work includes representations of all the solar cell's open circuit voltage (Voc), short circuit current density (Jsc), maximum power (Pm), fill factor (FF), and photovoltaic efficiencies. The simulation's findings could be useful in the creation and comprehension of high-efficiency thin film solar cells.

Journal of Theoretical and Applied Physics (JTAP) Rational solutions to the KdV equation from Riemann theta functions Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Rational solutions to the KdV equation from Riemann theta functions 10.57647/J.JTAP.2023.1703.27 EN Pierre Gaillard Universit ́e de Bourgogne Franche Comt ́e, Institut de math ́ematiques de Bourgogne, Dijon Cedex, France Journal Article 2023 11 17 Rational solutions to the KdV are constructed from the finite gap solutions of the KdV equation given in terms of abelian functions. For this we use a previous result giving the connection between Riemann theta functions and Fredholm determinants and also wronskians. By choosing the parameters of these solutions according to a number intended to move towards zero, we obtain rational solutions when this number tends towards zero. So, we construct a hierarchy of rational solutions depending on multi real parameters and we give explicitly expressions for the first orders.

Journal of Theoretical and Applied Physics (JTAP) Modeling of discharge processes in a new type of pulse-plasma ignition systems with a controlled spark gap Volume 17 (2023) JTAP Issue 3, July & August 2023 2023 11 17 Modeling of discharge processes in a new type of pulse-plasma ignition systems with a controlled spark gap 10.57647/J.JTAP.2023.1703.26 EN Farit Gizatullin Department of Electromechanics, Ufa University of Science and Technology, Ufa, Russia 0000-0003-2282-7546 Renat Salikhov Department of Electromechanics, Ufa University of Science and Technology, Ufa, Russia 0000-0003-2321-6237 Andrey Lobanov Department of Electromechanics, Ufa University of Science and Technology, Ufa, Russia 0000-0002-9532-2365 Journal Article 2023 11 17 The results of computer and physical modeling of discharge processes in a new type of pulse-plasma ignition systems for gas turbine engines with a controlled switching spark gap are presented. A circuit design model of a pulse-plasma ignition system has been developed, which makes it possible to evaluate the patterns of discharge processes in a semiconductor spark plug depending on the parameters of the discharge circuits - the capacitances of high-voltage and low-voltage storage capacitors, the inductance of the main discharge circuit. The results of computer simulation are confirmed experimentally, the increased efficiency of the ignition system with a controlled spark gap compared to the known circuit solutions containing two switching spark gaps is substantiated.