2-DIMENSIONAL ELECTRON LIQUID IN A WEAK MAGNETIC-FIELD

We present a theory describing the low-energy properties of an interac ting two-dimensional electron gas in a magnetic field at large non-int eger filling factors nu much greater than 1. For a moderate interactio n strength, r(s)<1, we find two energy scales controlling the electron dynamics at energies less than HBAR omega(c). The first energy scale, (HBAR omega(c)/nu)ln(nu r(s)), appears in the one electron spectral d ensity as the width of a pseudogap. The second and larger scale, r(s)H BAR omega(c), characterizes the exchange-enhanced spin splitting and t he thermodynamic density of states.