Abstract
A depletion of the quantum region of a 2D electron fluid in density—temperature space occurs due to Coulomb interaction. This depletion causes the energy to decrease when r s increases. The ground state energy obtained by a noniterative method stays positive and makes it necessary to reexamine the energy evaluated by an iterative method when the latter becomes negative. A 2D characteristic appears in the field dependent Fermi momentum. The effective g factor determined from the paramagnetic susceptibility increases with decreasing density, in agreement with experiment. The effective mass obtained from the finite temperature energy and from the diamagnetic susceptibility shows nonlinear dependences on density and other parameters. In the nonlinear dependences due to the exchange interaction, a remarkable relationship between the thermal and magnetic responses of the electron system is found.
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