Significant g-factor values of a two-electron ground state in quantum dots with spin-orbit coupling

Details Significant g-factor values of a two-electron ground state in quantum dots with spin-orbit coupling Significant g-factor values of a two-electron ground state in quantum dots with spin-orbit coupling

2007-10-15

arxiv.org/abs/0710.2772v2

Phys. Rev. B 78, 195306 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7+ pages, 7 figures

Scientific paper

10.1103/PhysRevB.78.195306

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.

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