A comparative study on heat capacity, magnetization and magnetic susceptibility for a GaAs quantum dot with asymmetric confinement

• Published in: Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2018-09, Vol.103, p.464-470
• Main Authors: Castaño-Yepes, J.D., Ramirez-Gutierrez, C.F., Correa-Gallego, H., Gómez, Edgar A.
• Format: Article
• Language: English
• Subjects: Gallium arsenide; Magnetic properties; Quantum confinement; Thermal properties
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2018.05.022

In this work, thermal and magnetic properties for an electron with cylindrical confinement in presence of external electric and magnetic fields have been investigated. It was found that the corresponding time-independent Schrödinger equation can be separated into the product of the radially symmetric and an axial equation. Moreover, an approximated expression for the energy spectrum of the system has been obtained in terms of the exact solutions for the radial equation and an approximation up to first order for the axial equation. The well-known thermal and magnetic properties as the heat capacity, magnetization and the magnetic susceptibility have been analyzed via the canonical partition function. It was disclosed that the results for thermal and magnetic properties differ significantly from results previously obtained by others authors. Moreover, these results are in agreement with the diamagnetic properties of GaAs. •A correction on the partition function reported by Gumber et al. is presented.•We find several deviations of the thermodynamic properties reported by Gumber et al.•We include the spin contribution to calculate the magnetic phase diagram which is consistent with previous works.