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Chaotic behavior of open quantum dots and other nanostructure

Mahir Saleh Hussein

Published Jan 1, 2013• 0 citations
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Abstract In this letter, we investigated the behaviors of the absorptive–dispersive properties of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, Schrödinger and Poisson equations must be solved self consistently for carriers (here electrons) in quantum dots. The enhanced refractive index with amplification can be obtained via adjusting the corresponding controllable parameters such as intensity, detuning and relative phase of the applied fields. Our proposed scheme provides a realistic model for controlling the index of refraction in a quantum dot nanostructure.
The dispersion behaviors of weak probe light in an InGaN/GaN quantum dot (QD) nanostructure driven by a coherent coupling field is investigated. InGaN/GaN QD nanostructure is designed numerically by solving the Schrödinger–Poisson coupled equations. By specific values of QD radius, an appropriate four-level QD nanostructure which is suitable for interaction by a weak probe light and a coherent coupling field is designed. It is shown that switching from normal to anomalous dispersion can be achieved by the intensity of coupling field. Therefore, fast light propagation in this model can be obtained by reduced absorption.
In this paper, we propose a model for controlling the optical bistability in four-level [Formula: see text] quantum dot nanostructure which is embedded in a unidirectional ring cavity. [Formula: see text] quantum dot nanostructure is based on our recent paper [S. H. Asadpour, Z. Golsanamlou and H. R. Soleimani, Physica E 54 (2013) 45]. It is found that intensity threshold of optical bistability can be manipulated by signal intensity of applied fields. Moreover, we find that phase variation of terahertz signal field can also affect the behaviors of optical bistability and hysteresis loop.