The magnetization of 2d mesoscopic disordered clusters is studied as a function of the Coulomb energy to kinetic energy ratio r(s). Between the Fermi system ( small r(s)) and the Wigner molecule (large r(s)), 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 Lande g factor observed in macroscopic systems is reproduced by those mesoscopic systems for similar ratios r(s). [References: 23]
展开▼
