Few-electron quantum dots and disks in zero magnetic field: possible indications on a liquid–solid transition

Exact-diagonalization studies of few-electron quantum dots and disks are performed, with the aim to investigate a Wigner cluster—Fermi liquid crossover in zero magnetic field at varying strength of Coulomb interaction. A clear indication of a transition of a liquid–solid type in the ground state is found in a more adequate quantum-disk model.