Department of Physics & Materials Science

Exploring Rabi Oscillations, Maximally Entangled States and Perfect Teleportation in the Anti-Jaynes-Cummings Interaction: Insights into Quantum Dynamics and Entanglement Applications

Mayero, Christopher; Omolo, Joseph Akeyo (BP International, 2024-11-11)

This study presents a method for producing maximally entangled qubit states, also known as entangled anti-polariton qubit states, in the anti-Jaynes-Cummings interaction mechanism. We show that, in an initial vacuum-field, ...

Tuning the structural and mechanical properties of SiC-Li and SiC-Na alloys for aerospace application: an ab initio study

Otieno, Ochieng Victor; Ongwen, Nicholas; Otieno, Calford (Journal of Physics Communications, 2024-11-04)

Aluminum (Al) and its alloys are popular in the aerospace industry due to their high strength-to-weight ratio, corrosion resistance, and ductility. However, these properties (extreme ductility and malleability) can compromise ...

First principles investigation of elastic, electronic and thermoelectric properties of lead-free Cs–X–I (X= Pb, Gd, Nd, Y) perovskites

Alruqi, Adel Bandar; Ongwen, Nicholas Ogada (Journal of Physics Communications, 2024-10-31)

Perovskites have become the center of recent research for their possible application in perovskite solar cells, owing to their desirable optical and electronic properties, flexibility, tunability, and low–cost fabrication. ...

Synthesis and Characterization of Cadmium Tin Oxide for MEMS Substrates and Its Comparative Computational Study with Silicon and Silicon Carbide

Ongwen, Nicholas (Springer US, 2024-10-22)

The rising demand for semiconductor substrates for printing electronic circuits has been sparked by recent breakthroughs in electronics. The most popular substrate for printing these devices is silicon (Si), which is chosen ...

Gravitation in Flat Euclidean Spacetime Frame: Unified Electrogravity and Magnetogravity Forces

Kibande, Wellingtone; Omolo, Joseph Akeyo; Simiyu, Dismas Wamalwa (European Journal of Applied Physics, 2024-07-15)

An effective description of physics requires an appropriate geometrical frame. Three-dimensional Euclidean space provides the geometrical frame for non-relativistic physics. A derivation of an imaginary temporal axis− icˆq ...

Optical properties of silver-doped zinc oxide thin films: an optimization study

Omina, Betty N; Juma, Albert O; Muiva, Cosmas M; Oduor, Andrew O (Springer US, 2024-07-27)

Silver (Ag), not only alters the electrical and optical properties of ZnO thin films but also has the ability to enhance its ultraviolet (UV) emission. However, the mechanism for the UV emission enhancement has not been ...

Convergence of the Laplace and the alternative multipole expansion approximation series for the Coulomb potential

Jobunga, EO; Wandera, CO; Okeyo, OS (Nature Publishing Group UK, 2023-09-25)

Multipole expansion is a powerful technique used in many-body physics to solve dynamical problems involving correlated interactions between constituent particles. The Laplace multipole expansion series of the Coulomb ...

Characterization of atomic state evolution in the JC and anti-JC models: spin-displaced field modes in the quantum Rabi model

Omolo, Joseph Akeyo (Research gate, 2023-03-20)

In this article, characterization of the atomic state evolution in the Jaynes-Cummings (JC) and anti-Jaynes-Cummings (aJC) models means using the reduced atomic state degree of purity, concurrence and spin excitation number ...

A Comparative Thermodynamic Study of AlF3, ScF3, Al0.5Sc0.5F3, and In0.5Sc0.5F3 for Optical Coatings: A Computational Study

Alruqi, Adel Bandar; Ongwen, O. Nicholas (MDPI, 2023-11-27)

Optical coatings are thin layers of materials applied to optical components in order to modify the transmission, reflection, or polarization properties of light. The common materials used for optical coatings include ...

Structural and Mechanical Properties of NbN Alloyed with Hf, In, and Zr for Orthopedic Applications: A First-Principles Study

Alruqi, Adel Bandar; Ongwen, O. Nicholas (MDPI, 2024-01-17)

The search for biocompatible, non-toxic, and wear-resistant materials for orthopedic implant applications is on the rise. Different materials have been investigated for this purpose, some of which have proved successful. ...

Investigating the Young's modulus of Cu-Al-Be shape memory alloy using a phase diagram, vibration spectroscopy and ultrasonic waves

Benlachemi, Rania; Ogam, Erick; Ongwen, Nicholas; Boudour, Amar; Fellah, Zine El Abiddine (Elsevier, 2024-03-05)

This work presents a method for determining the effective Young’s modulus (Eeffective) and Poisson ratio of small specimens of a ternary shape memory alloy (SMA), Cu-Al-Be. The alloys were synthesized uniformly and ...

Glass photonics meets photovoltaics: general principles and a case study

Otieno, Francis; Airo, Mildred; Quandt, Alex; Wamwangi, Daniel; Erasmus, M. Rudolph (Springer Berlin Heidelberg, 2023-11-01)

In this study, we present a promising combination of glass photonics and photovoltaics to develop more efficient types of solar cells. Following up on earlier suggestions, we demonstrate that fundamental losses due to the ...

The correlation between equatorial electrojet and equatorial ionisation anomaly over the East African region during the solar minimum period 2008-2009

Milimu, Hannington; Omondi, George; Mungufeni, Patrick (East African Journal of Science, Technology and Innovation, 2023-09-29)

This study analyzed the correlation between the equatorial electrojet (EEJ) and the occurrence of equatorial ionisation anomaly (EIA) over the East African region. The study was carried out during both geomagnetically ...

Thermal properties and pressure-dependent elastic constants of cadmium stannate as a substrate for MEMS: An ab initio study

Ongwen, Nicholas; Ogam, Erick; Fellah, Zine El Abiddine; Mageto, Maxwell; Othieno, Herrick; Otunga, Henry (North-Holland, 2023-02-15)

Silicon carbide (SiC) has become a suitable replacement to silicon as a substrate for manufacture of microelectromechanical systems (MEMS) that operate in harsh environmental conditions, owing to its better mechanical ...

Thermal properties and pressure-dependent elastic constants of cadmium stannate as a substrate for MEMS: An ab initio study

Nicholas Ongwen, Henry Otunga; Ogam, Erick; Fellah, Z. E. A; Mageto, Maxwell; Othieno, Herrick (Elsevier, 2023-02-15)

Silicon carbide (SiC) has become a suitable replacement to silicon as a substrate for manufacture of microelectromechanical systems (MEMS) that operate in harsh environmental conditions, owing to its better mechanical ...

Thermal properties and pressure-dependent elastic constants of cadmium stannate as a substrate for MEMS: An ab initio study

Ongwen, Henry Otunga Nicholas; Ogam, Erick; Fellah, Z. E. A; Mageto, Maxwell; Othieno, Herrick (Elsevier, 2023)

Silicon carbide (SiC) has become a suitable replacement to silicon as a substrate for manufacture of microelectromechanical systems (MEMS) that operate in harsh environmental conditions, owing to its better mechanical ...