Abstract
The crossover from weak to strong correlations in parabolic quantum dots at zero magnetic field is studied by numerically exact path-integral Monte Carlo simulations for up to eight electrons. By the use of a multilevel blocking algorithm, the simulations are carried out free of the fermion sign problem. We obtain a universal crossover governed only by the density parameter . For , the data are consistent with a Wigner molecule description, while, for , Fermi liquid behavior is recovered. The crossover value is surprisingly small.
- Received 11 November 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.3320
©1999 American Physical Society