Interaction effects in the mesoscopic regime: A quantum Monte Carlo study of irregular quantum dots

Journal Article

We address the issue of accurately treating interaction effects in the mesoscopic regime by investigating the ground-state properties of isolated irregular quantum dots. Quantum Monte Carlo techniques are used to calculate the distributions of ground-state spin and addition energy. We find a reduced probability of high spin and a somewhat larger even/odd alternation in the addition energy from quantum Monte Carlo than in local spin-density-functional theory. In both approaches, the even/odd effect gets smaller with increasing number of electrons, contrary to the theoretical understanding of large dots. We argue that the local spin-density approximation overpredicts the effects of interactions in quantum dots. © 2005 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Ghosal, A; Umrigar, CJ; Jiang, H; Ullmo, D; Baranger, HU

Published Date

  • June 15, 2005

Published In

Volume / Issue

  • 71 / 24

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

International Standard Serial Number (ISSN)

  • 1098-0121

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.71.241306

Citation Source

  • Scopus