Superconductivity, pseudogap, and phase separation in topological flat bands
2020
Can superconductivity exist even if the electron kinetic energy is completely quenched, as in a flat band? This is fundamentally a nonperturbative problem, since the interaction strength is the only relevant energy scale. Here, the authors study a two-dimensional model of an isolated Chern band at partial filling with local attractive interactions. Their quantum Monte Carlo calculations demonstrate unambiguously that the ground state is a superconductor, emerging from an incoherent Cooper-pair liquid at temperatures above a critical temperature. Strikingly, the latter scales almost linearly with the interaction strength.
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