Laser light and external magnetic field control of polaron in asymmetric quantum dot

Abstract

The possibility of controlling a polaron in an asymmetric quantum dot with external magnetic field and laser light is examined in this paper. Analytical studies are done using a modified Lee-Low-Pines method. We calculate the fundamental and first state energies which form a single qubit and further determine the probability density and the Shannon's entropy. These quantities as well as the mobility are influenced by the laser parameters, the size of the system and the magnetic field. The results performed show that the energy increases with the cyclotron frequency and the confinement strength of the potential. The analytical results highlight the fact that the application of the magnetic fields and laser enhances the possibility of finding discrete electronic states in quantum dots. The decoherence process is found to be greatly affected by the high-frequency laser field considered. Furthermore, it is reduced when particles are more confined in the nanostructure. It is established that a strong magnetic field and a low laser frequency enable the trapping and cooling of the polaron.