Kerr dispersion in a Y-configuration quantum dot system

Abstract

We introduce a Y-configuration model for a double quantum dot (QD) system, which is modeled for Kerr nonlinearity using the density matrix theory. Inhomogeneity in QDs is included in the calculations of the real part (Kerr) and the imaginary part (absorption) of the density matrix, which has not been covered before in Kerr calculations. Five configurations are studied: Y, ladder, Λ, staircase, and weak probe. Frequency detunings, controlling fields, and phases are used to study the structures. Our system shows high controllability as well as a giant Kerr dispersion, propagation without distortion, wide electromagnetic induced transparency, and switching between subluminal to superluminal propagation by tuning its fields.

Spontaneously generated coherence in ladder-plus-Y double quantum dot system

“…Such identical relaxation was used in many works. 20,21,[29][30][31] Figure 2(a) shows linear susceptibility for DQD ladder-plus-Y structure without (i.e. p = 0) and with SGC.…”

“…17 Y-configuration in DQD structure was proposed. 20,21 In the recent article, Al-Nashy et al 22 studies SGC in DQD Y-structure. Since QD structures are multilayered where they are formed by different layers (a two-dimensional wetting layer, WL, and a completely quantized QD layer), 23 thus it is important to include the effect of WL in the simulation of SGC.…”

Terahertz emission in ladder plus Y-configurations in double quantum dot structure

“…This makes the inhomogeneity in the calculation of SONS, which reduced the imaginary part to 1.87 m∕V, i.e., approximately half. Inhomogeneity was also shown to reduce Kerr (third-order) susceptibility to its halfvalue [10,11]. Figure 3(b) shows that SONS reduced by three orders and the wavelength was red shifted to 80 μm when the field strength increased to 100 kV∕cm, providing evidence of the difference between conduction subband energies (see Fig.…”

“…The Y-configuration in a four-level double QD system and the possibility of manipulation of QD subbands to control its linear and nonlinear Kerr have been introduced and predicted [10,11]. Rong et al studied THz generation in the double QD system considering ground conduction and valence QD subbands.…”