Thermodynamic magnetization of a strongly interacting two-dimensional system

Magnetic properties of the strongly-interacting electron gas have long been a subject of intensive theoretical and experimental investigations. The Coulomb interaction, as reflected by the exchange term, favors parallel spins, and therefore leads to ferromagnetism, whenever it is strong enough. The strength of the interaction is determined by the ratio between the typical Coulomb and kinetic energies, and is customarily characterized by a dimensionless parameter rs = �/aB, aB being the Bohr radius in the material, and � � n −1/d is the effective distance between electrons in d dimensions; in two dimen.