Ground state transitions in vertically coupled three-layer single-electron quantum dots

We study a vertically coupled three-layer single quantum dot under a magnetic field by the exact diagonalization of the Hamiltonian matrix. Effects of the inter-layer separation and the external magnetic field are reported. We find that dot-dot distance and electron-electron interaction strongly affect the low-lying states of the coupled quantum dots. The inter-dot correlation leads to the disappearance of some ground state transitions which are otherwise present in uncoupled dots.