L. Swierkowski et Ah. Macdonald, TRANSVERSE PSEUDOSPIN SUSCEPTIBILITY AND TUNNELING PARAMETERS OF DOUBLE-LAYER ELECTRON-GAS SYSTEMS, Physical review. B, Condensed matter, 55(24), 1997, pp. 16017-16020
The subbands of weakly coupled double-layer two-dimensional-electron-g
as systems consist of narrowly spaced pairs whose corresponding wave f
unctions are symmetric and antisymmetric combinations of isolated laye
r subband wave functions. The energetic spacing within a pair is 2t, w
here t is the interlayer tunneling amplitude. t is an important parame
ter in modeling these systems and, if interactions could be neglected,
it would be proportional to beating frequencies seen in weak-field ma
gnetic oscillations experiments and therefore readily measurable. We p
oint out that interactions alter the beating frequency. We discuss sim
ilarities and differences between this effect and exchange-correlation
-enhanced spin splitting.