Finite-thickness effects in ground-state transitions of two-electron quantum dots

Details Finite-thickness effects in ground-state transitions of two-electron quantum dots Finite-thickness effects in ground-state transitions of two-electron quantum dots

2007-11-08

arxiv.org/abs/0711.1246v1

Phys. Rev. B76, 193306 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.193306

Using the exactly solvable excitation spectrum of two-electron quantum dots with parabolic potential, we show that the inclusion of the vertical extension of the quantum dot provides a consistent description of the experimental findings of Nishi et al. [Phys.Rev.B75, 121301(R) (2007)]. We found that the second singlet-triplet transition in the ground state is a vanishing function of the lateral confinement in the three-dimensional case, while it always persists in the two-dimensional case. We show that a slight decrease of the lateral confinement leads to a formation of the Wigner molecule at low magnetic fields.

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