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 N=2 and N=4 components. We derive a mean-field scaling relation between the results for different values of N, and study its breakdown due to beyond mean-field effects. The predicted signatures occur at temperatures above the Néel temperature and persists even in the presence of a trapping potential, thus they are observable in current ultracold gas experiments.
Original languageEnglish
Article numberL031301
Pages (from-to)1-7
Number of pages7
JournalPhysical Review A
Volume103
Issue number3
DOIs
Publication statusPublished - 3 Mar 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Condensed Matter - Quantum Gases

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  • Flat bands and disorder: Flat bands and disorder

    Peotta, S. (Principal investigator)

    01/09/202031/08/2025

    Project: RCF Academy Research Fellow (new)

  • Peotta Sebastiano AT-kulut

    Peotta, S. (Principal investigator)

    01/09/202031/08/2023

    Project: RCF Academy Research Fellow: Research costs

  • Long-range coherence in nanosystems

    Törmä, P. (Principal investigator)

    01/01/202031/12/2021

    Project: Academy of Finland: Other research funding

  • Science-IT

    Hakala, M. (Manager)

    School of Science

    Facility/equipment: Facility

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