Flat band induced non-Fermi liquid behavior of multicomponent fermions

Pramod Kumar, Sebastiano Peotta, Yosuke Takasu, Yoshiro Takahashi, Päivi Törmä

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Abstract

We investigate multicomponent fermions in a flat band and predict experimental signatures of non-Fermi liquid behavior. We use dynamical mean-field theory to obtain the density, double occupancy and entropy in a Lieb lattice for $\mathcal{N} = 2$ and $\mathcal{N} = 4$ components. We derive a mean-field scaling relation between the results for different values of $\mathcal{N}$, and study its breakdown due to beyond-mean field effects. The predicted signatures occur at temperatures above the Néel temperature and persist in presence of a harmonic trapping potential, thus they are observable with current ultracold gas experiments.
Original languageEnglish
JournalarXiv
Publication statusAccepted/In press - 1 May 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Condensed Matter - Quantum Gases

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