Tc amplication and pseudogap at a shape resonance in a superlattice of quantum stripes
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- Valletta, A., Bardelloni, G., Brunelli, M. et al. J Supercond (1997) 10: 383. doi:10.1007/BF02765723
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The shape resonance of the superconducting gap for a 2D electron gas in a superlattice of quantum stripes with a finite 1 D periodic potential barrier is studied when the Fermi level is tuned near the bottom of the third superlattice subband. The maximumTc. appears at a critical charge densityTc. Forp > pc (in the underdoped regime) the chemical potential is tuned in a pseudogap region characterized by a decrease of the density of states and an opening of the partial gap at the Fermi surface. The pseudogap is closed forp< pc (in the overdoped regime).