Electronic and magnetic properties of a two-electron Gaussian GaAs quantum dot with spin-Zeeman term: A study by numerical diagonalization
| Autor: | Ashok Chatterjee, Hemant Kumar Sharma, Aalu Boda, Bahadir Boyacioglu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Physics Zeeman effect Condensed matter physics Magnetic moment 02 engineering and technology Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetic susceptibility Electronic Optical and Magnetic Materials Magnetic field symbols.namesake Quantum dot 0103 physical sciences symbols Diamagnetism 0210 nano-technology Spin-½ |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 469:171-177 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2018.07.070 |
| Popis: | The problem of two interacting electrons moving in a two-dimensional semiconductor quantum dot with Gaussian confining potential under the influence of an external magnetic field is studied by numerical diagonalization of the Hamiltonian matrix. The energy spectrum, the magnetic moment and the susceptibility are calculated as a function of the magnetic field and the quantum dot parameters. The magnetic moment and the magnetic susceptibility are shown to have zero-temperature diamagnetic peaks due to the exchange-induced singlet-triplet oscillations. The position and the number of these peaks depend on the size of the quantum dot and also the strength of the electron-electron interaction. The addition energies of the two low-lying states are also obtained by directly calculating the chemical potential. Besides, the electric capacitance is calculated as well. The theory is applied to a GaAs quantum dot. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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