arXiv subjects

K. Koksal

Publications and source records attributed to K. Koksal.

6 recordsLinked to original sources

arXiv2024

Reply to Comment by K. Forbes on "The super-chirality of vector twisted light" by M. Babiker, J. Yuan, K. Koksal and V. E. Lembessis; Optics Communications 554, 130185 (2024)

We respond to the recent comment in Optics Communications by Kayn Forbes on our recent Optics Communications article and we maintain that, contrary to what Forbes claims, substantial superchirality exists as a property of the $m\geq 1$ higher order Poincare modes. Forbes arguments are based on misconceptions and analytical errors, leading to erroneous results and unjustified criticism.

physics.optics↗

arXiv2006

A note on the Woods-Saxon potential

The wave Schrodinger and, to clarify one interesting point encountered in the calculations, Klein-Gordon equations are solved exactly for a single neutron moving in a central Woods-Saxon plus an additional potential that provides a flexibility to construct the surface structure of the related nucleus. The physics behind the solutions and the reliability of the results obtained are discussed carefully with the consideration of other related works in the literature. In addition, the exhaustive analysis of the results reveals the fact that the usual Woods-Saxon potential cannot be solved analytically within the framework of non-relativistic physics, unlike its exactly solvable relativistic consideration.

nucl-th↗

arXiv2006

Comparison of the Band Alignment of Strained and Strain-Compensated Gainnas QWS on Gaas and Inp Substrates

We present a comparison of the band alignment of the Ga1-xInxNyAs1-y active layers on GaAs and InP substrates in the case of conventionally strained and strained-compensated quantum wells. Our calculated results present that the band alignment of the tensiley strained Ga1-xInxNyAs1-y quantum wells on InP substrates is better than than that of the compressively strained Ga1-xInxNyAs1-y quantum wells on GaAs substrates and both substrates provide deeper conduction wells. Therefore, tensiley strained Ga1-xInxNyAs1-y quantum wells with In concentrations of x<=0.53 on InP substrates can be used safely from the band alignment point of view when TM polarisation is required. Our calculated results also confirm that strain compensation can be used to balance the strain in the well material and it improve especially the band alignment of dilute nitride Ga1-xInxNyAs1-y active layers on GaAs substrates. Our calculations enlighten the intrinsic superiority of N-based lasers and offer the conventionally strained and strain-compensated Ga1-xInxNyAs1-y laser system on GaAs and InP substrates as ideal candidates for high temperature operation.

cond-mat.mtrl-sci↗

arXiv2006

A search on the Nikiforov-Uvarov formalism

An alternative treatment is proposed for the calculations carried out within the frame of Nikiforov-Uvarov method, which removes a drawback in the original theory and by pass some difficulties in solving the Schrodinger equation. The present procedure is illustrated with the example of orthogonal polynomials. The relativistic extension of the formalism is discussed.

quant-ph↗

arXiv2005

Equivalence of two alternative approaches to Schrodinger equations

Recently developed simple approach for the exact/approximate solution of Schrodinger equations with constant/position-dependent mass, in which the potential is considered as in the perturbation theory, is shown to be equivalent to the one leading to the construction of exactly solvable potentials via the solution of second-order differential equations in terms of known special functions. The formalism in the former solves difficulties encountered in the latter in revealing the corrections explicitly to the unperturbed piece of the solutions whereas the other obviate cumbersome procedures used in the calculations of the former.

quant-ph↗

arXiv2005

An Alternative Treatment for Yukawa-Type Potentials

We propose a new approximation scheme to obtain analytic expressions for the bound state energies and eigenfunctions of Yukawa like potentials. The predicted energies are in excellent agreement with the accurate numerical values reported in the literature.

quant-ph↗