Regular Article

Controllable double tunneling induced optical soliton storage in linear triple quantum dot molecules

Department of Physics & Institute for Nanophysics and Rare-earth Luminescence, Xiangtan University, Xiangtan, 411105 Hunan, P.R. China

^a e-mail: jwding@xtu.edu.cn
^b e-mail: dlwang@xtu.edu.cn

Received: 29 October 2019
Accepted: 6 August 2020 Received in final form: 9 May 2020

Published online: 22 September 2020

Abstract

We propose an asymmetric linear triple quantum dot molecule model for a recent experimental device with a double neighboring dot-dot tunneling coupling, of which the linear and nonlinear dynamical properties are analytically studied by using an amplitude variable approach combined with multi-scale method. It is shown that double transparency windows are formed by the double tunneling coupling. Both dark and bright optical solitons are then obtained, of which both the types and the propagating velocity can be controlled by the two tunneling coupling strengths. Interestingly, the propagating velocity of the solitons can approach to zero at certain tunneling coupling strengths, the motionless optical solitons appearing there. The results indicate potential applications of the semiconductor quantum devices for optical soliton storage.