Electronic structure of three-dimensional quantum dots in tilted magnetic fields

We investigate the electronic structure of three-dimensional quantum dots with two electrons in high magnetic fields and find that the combined effect of electron-electron interaction and hybrid-magnetoelectric quantization governs the whole energy spectrum. As a result, the spin transitions in the ground state of a quantum-dot disk can be quenched in the three-dimensional dot by relaxing the vertical confinement, or can be reentrant by tilting the magnetic field. We demonstrate that such behavior clearly appears in heat capacity and magnetization at sufficiently low temperatures. © 1994 The American Physical Society.