Interplay of Inter-Dot Tunneling and Quantum Interference under Optical Vortex Beams to Induce Spatially Dependent Optical Effects in Quantum Dot Molecules

Abstract

In this work, we investigate the spatially dependent optical properties of quantum dot (QD) molecules interacting with optical vortex beams. By analyzing the absorption and dispersion profiles of a weak probe field, we uncover the influence of tunneling and quantum interference mechanisms on the system's response. The optical vortex beams, characterized by their orbital angular momentum (OAM), introduce azimuthal dependence in the susceptibility of the QD system. When tunneling alone is present, petal-like patterns emerge in the spatial profiles, with their symmetry determined by the OAM of the signal field. These patterns undergo rotation in the azimuthal plane as the relative phase of the applied fields varies. Similarly, when quantum interference dominates, distinct symmetry-driven features arise, demonstrating phase-sensitive spatial modulation. Notably, when both tunneling and quantum interference are present, the profiles exhibit reduced absorption and gain due to the combined effects of state delocalization and modified decay pathways. Our findings highlight the complex interplay between tunneling and quantum interference, offering pathways for controlling light-matter interactions in QD systems. These results pave the way for innovative applications in structured light technologies, optical switching, and quantum information processing.