Title: Unidirectional flow of composite bright-bright solitons through asymmetric double potential barriers and wells

Abstract

We investigate the dynamics of two component bright-bright (BB) solitons through reflectionless double barrier and double well potentials in the framework of a Manakov system governed by the coupled nonlinear Schrödinger equations. The objective is to achieve unidirectional flow and unidirectional segregation/splitting, which may be used in the design of optical data processing devices. We observe how the propagation of composite BB soliton is affected by the presence of interaction coupling between the two components passing through the asymmetric potentials. We consider Gaussian and Rosen-Morse double potential barriers to achieve the unidirectional flow. Moreover, we observe a novel phenomenon which we name “Polarity Reversal” in the unidirectional flow. In this situation, the polarity of the diode is reversed. To understand the physics underlying these phenomena, we perform a variational calculation where we also achieve unidirectional segregation/splitting using an asymmetric double square potential well. Our comparative study between analytical and numerical analysis lead to an excellent agreement between the two methods.

Biography

Amaria Javed received her master’s degree in Physics from Quaid-i-Azam University (QAU), Islamabad, in 2012. Then she obtained her M.Phil degree in Physics from the same institute in 2015 with thesis research on Quantum entanglement between electronic spin and spatial states in graphene. She earned her Doctorate (PhD) in theoretical physics (nonlinear physics, more precisely) from United Arab Emirates University (UAEU) in 2021, and she became the first PhD graduate in the field of physics from UAEU. She has published her research in many prestigious journals. She has also presented her research at different international forums. She has been awarded the Golden visa (10-year residency) by the UAE government under the special talent category. Her PhD research focused on all-optical data communication through solitons in waveguide arrays. She tackled both fundamental and applied issues. She used different analytical and numerical techniques to solve nonlinear Schrödinger equation (NLSE) and designed waveguide arrays that allow for proper data processing and, ultimately computing. She is also looking at the prospect of soliton scattering for quantum information processing. Right after her PhD defense, she joined a research project on nonlinear dynamics at Khalifa University (KU) Abu Dhabi. Currently, she is a Postdoctoral Associate at New York University Abu Dhabi (NYU Abu Dhabi).