Effect of Bound Polaron and Electromagnetic Field on Thermodynamic Properties of GaAs Quadratic Quantum Dot

Abstract

The effect of bound polaron on the thermodynamic properties of GaAs quantum dot (QD) with a quadratic potential in the presence of electromagnetic field is presented. The Schrodinger method as well as the canonical ensemble approach has been used to determine the energy of polaron and the thermodynamic properties such as heat capacity, entropy, and magnetic susceptibility with the help of canonical partition function. We found that the heat capacity increases with a potential confinement angle and also with temperature, and decreases with the increase in the magnetic field. This reduction in the heat capacity shows that our system behaves as a refrigerator. Furthermore, an increasing in magnetic field reduces the disorder in the quantum dot. Indeed, a strong increase in the magnetic field is much better for a good confinement of particles. Moreover, we found that the materials with low coupling constant avoid disorder in the quantum system. The polaron is therefore a good protector of the quantum dot against the external effects. We also found that an increasing temperature increases the speed of electrons and also for very small values of magnetic field, the system stores more energy. It is worthy to mention that our approach is consistent with the characteristic behavior of the diamagnetic materials, well-known as GaAs quantum dots.