Asian Journal of Research and Reviews in Physics https://journalajr2p.com/index.php/AJR2P <p style="text-align: justify;"><strong>Asian Journal of Research and Reviews in Physics (ISSN: 2582-5992)</strong> aims to publish high-quality papers in all areas of 'physics'. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer-reviewed, open access INTERNATIONAL journal.</p> SCIENCEDOMAIN international en-US Asian Journal of Research and Reviews in Physics 2582-5992 A Primer on Weyl Semimetals: Down the Discovery of Topological Phases https://journalajr2p.com/index.php/AJR2P/article/view/30136 <p>Recently discovered Weyl semimetals (WSM) have found special place in topological condensed matter studies for they represent first example of massless Weyl fermions found in electronic condensed matter systems. A WSM shows gapless bulk energy spectra with Dirac-like point degeneracies, famously called Weyl nodes, which carry with themselves well defined chiralities and topologically protected chiral charges. One finds the Berry curvature of the Bloch bands to become singular, like in a magnetic monopole, at these Weyl nodes. Moreover, these systems feature topological surface states in the form of open Fermi arcs. In this review, we undergo a concise journey from graphene based Dirac physics to Weyl semimetals: the underlying Hamiltonians, their basic features and their unique response to external electric and magnetic fields in order to provide a basic walk-through of how the Weyl physics unfolded with time starting from the discovery of Graphene.</p> Satyaki Kar Arun M. Jayannavar ##submission.copyrightStatement## 2021-02-18 2021-02-18 34 45 10.9734/ajr2p/2021/v4i130136 Numerical Modeling of Photonic Jet behind Triangular Prism https://journalajr2p.com/index.php/AJR2P/article/view/30131 <p>The scattering of electromagnetic plane waves by triangular prism and its truncated form (the isosceles triangle and the trapezoid are transverse sections, respectively) has been studied&nbsp;in order to determine possibility of high field intensity (photonic jet) formation. Using high-resolution finite-difference time-domain simulation, an optimal relationship between the wavelength and the size of the prism was found to form photonic jet&nbsp;with sub wavelength waist on the shadow side of the prism. Truncation of the prism (with trapezoids as transverse sections) leads to an improvement in the characteristics of photonic jets (intensity, length and waist). A qualitative explanation of the simulation results obtained is presented.</p> Arnold Abramov Yutao Yue Mingming Wang Zongyang Wang Yajun Xu ##submission.copyrightStatement## 2021-01-05 2021-01-05 1 6 10.9734/ajr2p/2021/v4i130131 Measurement and Evaluation of Radiation Power Density Emitted from Mobile Cellular Base Stations in Abuja and its Environ, Nigeria https://journalajr2p.com/index.php/AJR2P/article/view/30132 <p>This paper presents measurement and evaluation of radiation power density emitted from mobile cellular base stations in Abuja and it’s environ. Forty (40) mobile base stations with ten (10) each from AIRTEL, ETISALAT, GLO and MTN located in areas with high population were randomly examined across Abuja. Broadband analysis method was employed in the measurement of the radiation power density. The results obtained shows that most of the base stations recorded lower radiation power density below the safety standard value of 4.5watt/m<sup>2 </sup>, 22.5 watt/m<sup>2</sup> for 900MHz frequency though few base stations recorded above standard value: GLO-BS02, GLO-BS03 and MTN-BS02 recorded 59.02 mW/m<sup>2</sup>, 39.76 mW/m<sup>2</sup> and 46.70 mW/m<sup>2 </sup>respectively. The result also revealed that as distance increases, the mean power density reduces. This is to said that human exposure to radio frequency radiation have less or no health hazard at distance far away from the mobile cellular base station.</p> Ibrahim Aminu J. T. Zhimwang D. Adewumi R. S. Ibrahim M. Z. Musa D. D. Matthew ##submission.copyrightStatement## 2021-01-21 2021-01-21 7 13 10.9734/ajr2p/2021/v4i130132 Analytic Solutions of the Rotating and Stratified Hydrodynamical Equations https://journalajr2p.com/index.php/AJR2P/article/view/30133 <p>In this article we investigate the two-dimensional incompressible rotating and stratified, just rotating,&nbsp; just stratified Euler equations, comparing with each other and with the normal Euler equations with&nbsp; the self-similar Ansatz. The motivation of our study is the following the presented rotating stratified&nbsp; fluid equations can be interpreted as a well-established starting point of various more complex and&nbsp; more realistic meteorologic, oceanographic or geographic models. We present analytic solutions&nbsp; for all four models for density, pressure and velocity fields, most of them are some kind of power-law&nbsp; type of functions. In general the presented solutions have a rich mathematical structure. Some&nbsp; solutions show nonphysical explosive properties others, however are physically acceptable and&nbsp; have finite numerical values with power law decays. For a better transparency we present some figs&nbsp; for the most complicated velocity and pressure fields. To our knowledge there are no such analytic&nbsp; results available in the literature till today. Our results may attract attention in various scientific fields. &nbsp;&nbsp;</p> Imre F. Barna L. Mátyás ##submission.copyrightStatement## 2021-01-22 2021-01-22 14 26 10.9734/ajr2p/2021/v4i130133 First-principles Investigation of Structure and Electronic Properties of NiTe2 Fermi Crossing Type-II Dirac Semimetal https://journalajr2p.com/index.php/AJR2P/article/view/30135 <p>The electronic structure aspect of transition metal dichalcogenides (TMDs) has so far received intensive research interest. NiTe<sub>2 </sub>is a noble candidate for type-II DSM with Dirac point near the Fermi surface. In this paper we present a systematic investigation of the structural stabilities and electronic properties of NiTe<sub>2 </sub>using density functional theory via a plane wave pseudopotential method in the context of the Perdew–Burke–Ernzerh of generalized gradient approximation. The structural parameters, partial and total density of states (DOS) were systematically studied. Our structural study indicates that the material has a trigonal structure with P3̅m1 space group. In addition, we have computed the cohesive energy and the DOS at the Fermi level [N(E<sub>f</sub>)]. The results show that NiTe<sub>2 </sub>is stable.</p> Muzambilu Saminu Sofwan Ibrahim Saleh Shafiu Ibrahim Musa Gulzar Ahmed M. C. Idris ##submission.copyrightStatement## 2021-02-08 2021-02-08 27 33 10.9734/ajr2p/2021/v4i130135