Journal
PHYSICAL REVIEW B
Volume 103, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L220502
Keywords
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Funding
- Academy of Finland [303351, 307419, 327293]
- Magnus Ehrnrooth Foundation
- Academy of Finland (AKA) [327293, 307419, 303351, 327293, 307419, 303351] Funding Source: Academy of Finland (AKA)
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In the attractive Hubbard model on the Lieb lattice, insulating behavior is observed in the normal state on the flat band at interaction strengths lower than the hopping amplitude, while a flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions. Cluster dynamical mean-field theory was used to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster.
We study the attractive Hubbard model on 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 shows insulating behavior stemming from the localization properties of the flat band. A flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions.
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