Role of a parallel magnetic field in two dimensional disordered clusters containing a few correlated electrons

Abstract

An ensemble of 2d disordered clusters with a few electrons 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 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.

4 pages, 3 figures

References in corpus (1)

• No indications of metal-insulator transition for systems of interacting electrons in two dimensions

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