Fermion systems with flat bands can boost superconductivity by enhancing the density of states at the Fermi level. We use quasiexact numerical methods to show that repulsive interactions between spinless fermions in a one-dimensional (1D) flat-band system, the Creutz ladder, give a finite pairing energy that increases with repulsion, though charge quasiorder remains dominant. Adding an attractive component shifts the balance in favor of superconductivity and the interplay of two flat bands further yields a remarkable enhancement of superconductivity, well outside of known paradigms for 1D fermions.

中文翻译：

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平带系统中费米子排斥相互作用的超导配对

具有平带的费米子系统可以通过提高费米能级的态密度来提高超导性。我们使用准精确数值方法来证明一维 (1D) 平带系统 Creutz 梯子中无自旋费米子之间的排斥相互作用给出了一个有限的配对能量，该能量随着排斥而增加，尽管电荷准序仍然占主导地位。添加一个有吸引力的组件改变了有利于超导性的平衡，两个平坦带的相互作用进一步产生了超导性的显着增强，远远超出了已知的一维费米子范式。