Mollow triplet in Two-Impurity dumbbell quantum dot

Abstract

The current study uses various computational methods to determine the eigenvalues and eigenvectors of a specific system—namely, a two-impurity, two-electron system within a dumbbell-shaped quantum dot. Initially, the single-electron, single-impurity problem is resolved using the effective mass approximation and the finite element method. Subsequently, a technique similar to the linear combination of atomic orbitals is applied to derive singlet–triplet states. The research work deeply investigates the key characteristics of the mentioned states, with a particular focus on their energy splitting and exchange times. Additionally, it highlights the dynamic evolution of the singlet–triplet two-level system, illustrating its manipulation through detuning and Rabi frequency. The Mollow triplet spectrum is also calculated and analyzed under various initial conditions. The findings of this research have significant implications across multiple domains, including the advancement of quantum information processing, the enhancement of optoelectronic device performance, and the development of innovative sensing and communication technologies.

Keywords

• Two-impurities
• Dumbbell quantum dot
• Exchange interactions
• Mollow triplet