HIGH T-C SUPERCONDUCTIVITY IN A SUPERLATTICE OF QUANTUM STRIPES

The superconducting gap for 2D electron gas in a superlattice of quant um stripes with a finite 1D periodic potential barrier is calculated. The resonant enhancement of the superconducting gap is found when the Fermi level is tuned near the bottom of the nth superlattice subband w ith n greater than or equal to 2. The critical charge density rho(c) f or maximum T-c at the n = 2 resonance is mainly determined by the stri pe width L and vice versa, while it is nearly independent on the ampli tude of the potential barrier. The width of the resonance is determine d by the interaction cutoff (h) over bar omega(0) and its shape by the ratio Delta E(n perpendicular to)/(h) over bar omega(0), where Delta E(n perpendicular to) is the transversal energy dispersion of the n su bband due to the transverse hopping between stripes. (C) 1997 Elsevier Science Ltd.