Ym. Malozovsky et Jd. Fan, THE METAL-INSULATOR PHASE-TRANSITION, QUASI-PARTICLE DAMPING AND SUPERCONDUCTIVITY IN A LAYERED FERMI GAS, Superconductor science and technology, 9(8), 1996, pp. 622-638
By means of the Fermi-liquid approach, the effects of exchange and cor
relations are considered in a layered two-dimensional electron gas. A
graphical derivative technique is introduced to obtain the contributio
ns to the interparticle interactions from different channels. It is sh
own that the interaction in the particle-hole channel can induce the m
etal-insulator phase transition when the Fermi momentum is comparable
with the inverse interlayer spacing, p(F) approximate to 1/c. It is al
so shown that the Cooper-like scattering processes give rise to the sc
aling of the Fermi liquid response as chi similar to omega/T, which le
ads to the linear temperature dependence of the quasiparticle damping.
The possibility of superconductivity in the region between the insula
tor and normal metal phases, accounting for the particle-hole excitati
ons, is discussed. The effect of the spin fluctuations on the supercon
ductivity due to the particle-hole excitations is also considered.