Corpus ID: 220487077

Insulator-pseudogap crossover in the Lieb lattice

  title={Insulator-pseudogap crossover in the Lieb lattice},
  author={Kukka-Emilia Huhtinen and P. Torma},
  journal={arXiv: Strongly Correlated Electrons},
We study the attractive Hubbard model in the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynamical mean-field theory to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster. At interaction strengths lower than the hopping amplitude, we find that the normal state on the flat band is an insulator. The insulating behavior stems from the localization properties of the… Expand
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Electron-Phonon Interactions in Flat Band Systems
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