Role of a parallel magnetic field in two dimensional disordered clusters containing a few correlated electrons
Franck Selva, Jean-Louis Pichard
Abstract
An ensemble of 2d disordered clusters with a few electrons 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 interaction induced delocalization of the ground state takes place which is suppressed when the spins are aligned by a parallel magnetic field. Our results confirm the existence of an intermediate regime where the Wigner antiferromagnetism defavors the Stoner ferromagnetism and where the enhancement of the Lande g factor observed in dilute electron systems is reproduced.
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