Role of a parallel magnetic field upon a few correlated electrons trapped in 2d mesoscopic disordered clusters
CEA, Service de Physique de l'Etat Condensé,
Centre d'Etudes de Saclay F-91191 Gif-sur-Yvette Cedex, France
Accepted: 6 June 2001
The magnetization of 2d mesoscopic disordered clusters is studied as a function of the Coulomb energy to kinetic energy ratio rs. Between the Fermi system (small rs) and the Wigner molecule (large rs), an intermediate regime is observed where the Wigner antiferromagnetism defavors the Stoner ferromagnetism and where an interaction-induced delocalization of the ground state takes place which is suppressed when the spins are aligned by a parallel magnetic field. The enhancement of the Landé g factor observed in macroscopic systems is reproduced by those mesoscopic systems for similar ratios rs.
PACS: 71.10.-w – Theories and models of many-electron systems / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 2001