Laser Field Effect on the Electronic Properties of a Coupled Quantum Dot System (NM-QD-NM)

Abstract

In this work, a mathematical model is developed to investigate the electronic properties of a system where a laser field is directed at a quantum dot and the dot is placed between two nonmagnetic (NM) leads.  To test the electronic properties of the device and evolve a spin-dependent analytical equations for the occupancy numbers and quantum dot energy levels. The dealings within research are built on the time-independent Anderson-Newns model. All of these formulas have self-consistent solutions by the Fortran program, and the density of states is computed using them in the two regimes ( and ). All the parameters included in our studies can be tuned experimentally. It is found that the electronic properties (density of states) of the system are decreasing, and the energy windows increase as the parameter of laser effect (frequency =0.1,0.2,0.3 eV and broadening due to the laser field ) increase. The peaks of the density of states are shifted to positive energy for the system when the gate voltages  increase.  These findings have significant implications for nanotechnology, and the laser can be employed as a tool to facilitate the movement of electrons throughout the system.