MAGNETO-OSCILLATORY PHENOMENA IN DOUBLE-QUANTUM WELLS WITH ASYMMETRICSCATTERING .1. DENSITY-OF-STATES AND THERMODYNAMIC QUANTITIES

The one-particle Green's function, the density of states, and the ther modynamic quantities (susceptibility and specific heat) are evaluated for tunnel-coupled quantum wells with asymmetric scattering in the pre sence of a transverse quasiclassical magnetic field. The oscillations of the susceptibility and of the specific heat have different periods and widths;and depend sensitively on the level splitting between the l eft and right levels. Peculiar characteristics appear in the density o f states when the splitting due to tunneling is comparable to the diff erence in the broadening between wells of equal width. When the tunnel ing splitting is stronger than this difference two sets of peaks arise with the same width. In the opposite case, the peaks have different w idths but are superposed.