Significant g-factor values of a two-electron ground state in quantum dots with spin-orbit coupling
| Autor: | Weiss, Yuval, Goldstein, Moshe, Berkovits, Richard |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 78, 195306 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.78.195306 |
| Popis: | The magnetization of semiconductor quantum dots in the presence of spin-orbit coupling and interactions is investigated numerically. When the dot is occupied by two electrons we find that a level crossing between the two lowest many-body eigenstates may occur as a function of the spin-orbit coupling strength. This level crossing is accompanied by a non-vanishing magnetization of the ground-state. Using first order perturbation theory as well as exact numerical diagonalization of small clusters we show that the tendency of interactions to cause Stoner-like instability is enhanced by the SO coupling. The resulting g-factor can have a significant value, and thus may influence g-factor measurements. Finally we propose an experimental method by which the predicted phenomenon can be observed. Comment: 7+ pages, 7 figures |
| Databáze: | arXiv |
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