Finite-thickness effects in ground-state transitions of two-electron quantum dots | |
Article | |
关键词: MAGNETIC-FIELD; CAPACITANCE SPECTROSCOPY; ARTIFICIAL ATOMS; | |
DOI : 10.1103/PhysRevB.76.193306 | |
来源: SCIE |
【 摘 要 】
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 [Phys. Rev. B 75, 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.
【 授权许可】
Free