RASHBA AND DRESSELHAUS SPIN ORBIT EFFECTS ON THE MAGNETIZATION AND MAGNETIC SUSCEPTIBILITY OF INAS- QUANTUM WIRE
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Date
2022-09-25
Authors
Wafa Haj Mohammad
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Abstract
Abstract
Background: Nanomaterials play an important role in our life due to their potential in a wide range of device applications. Nano-materials are classified, according to their dimensions, into four types: Bulk, quantum well (QW), quantum well wire (QWW) and quantum dot (QD). A lot of research has been conducted on the properties of InAs QW and QWW material in the presence of an electric field. This study has looked at the magnetic properties of InAS QWW material under Rashba, Dresselhaus and the magnetic field effects. Transverse confinement potential was also taken into account.
Methodology: Magnetic properties, like magnetization and susceptibility for InAs quantum well wire (QWW) material, have been studied theoretically under applied external magnetic field, with spin orbital interactions (SOI) like Rashba and Dresselhaus effects. The Hamiltonian of a single electron, confined in a QWW, has been solved by exact diagonalization method to obtain the eigenvalues and eigenfunctions of energy states as a function of QWW physical parameters. The researcher computed the average energy and the eigenstates of energy sub-bands that split under external magnetic field, using Rashba effect and Dresselhaus effect. Magnetization and susceptibility were studied and the oscillating behavior of the curves were observed as a result of mixing energy sub-bands of QWW spectra.
Transverse conferment potential was taken into account. The average energy was studied under three effects with an external magnetic field. The magnetic properties were studied as well.
Results: The calculations showed clearly that the Rashba parameter was an important and effective factor in controlling the magnetic properties of QWW material type. Dresselhaus parameter was also an effective factor but was weaker than Rashba effect. The Transverse confinement potential had a marginal effect on magnetic properties of InAs-QWW material. However, the temperature showed a significant effect on the magnetic properties of the conceded QWW. When T increased, the average energy would increase, too. Therefore, magnetization M and susceptibility χ behaviors would accordingly change.
Conclusion: Rashba parameter is an important and effective factor that can control the magnetic properties of InAs QWW material. Dresselhaus parameter can also control the magnetic properties, but it is weaker than Rashba parameter. The Transverse confining potential has a marginal effect on magnetization and susceptibility of InAs-QWW material.
Keywords: InAs QWW, Rashba, Dresselhaus, magnetic field, magnetization, susceptibility.