Flat band induced non-Fermi liquid behavior of multicomponent fermions

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

doi:10.1103/PhysRevA.103.L031301

Flat band induced non-Fermi liquid behavior of multicomponent fermions

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

Research output: Contribution to journal › Article › Scientific › peer-review

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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 language	English
Article number	L031301
Pages (from-to)	1-7
Number of pages	7
Journal	Physical Review A
Volume	103
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.103.L031301
Publication status	Published - 3 Mar 2021
MoE publication type	A1 Journal article-refereed

Keywords

Condensed Matter - Quantum Gases

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10.1103/PhysRevA.103.L031301

PhysRevA.103.L031301-7Final published version, 954 KB

1 Active
5 Finished

Flat bands and disorder: Flat bands and disorder
Peotta, S. (Principal investigator)
01/09/2020 → 31/08/2025
Project: RCF Academy Research Fellow (new)
Peotta Sebastiano AT-kulut
Peotta, S. (Principal investigator)
01/09/2020 → 31/08/2023
Project: RCF Academy Research Fellow: Research costs
Long-range coherence in nanosystems
Törmä, P. (Principal investigator)
01/01/2020 → 31/12/2021
Project: Academy of Finland: Other research funding

Science-IT
Hakala, M. (Manager)
School of Science
Facility/equipment: Facility

Cite this

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title = "Flat band induced non-Fermi liquid behavior of multicomponent fermions",

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 N{\'e}el temperature and persists even in the presence of a trapping potential, thus they are observable in current ultracold gas experiments.",

keywords = "Condensed Matter - Quantum Gases",

author = "Pramod Kumar and Sebastiano Peotta and Yosuke Takasu and Yoshiro Takahashi and P{\"a}ivi T{\"o}rm{\"a}",

year = "2021",

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doi = "10.1103/PhysRevA.103.L031301",

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AU - Kumar, Pramod

AU - Peotta, Sebastiano

AU - Takasu, Yosuke

AU - Takahashi, Yoshiro

AU - Törmä, Päivi

PY - 2021/3/3

Y1 - 2021/3/3

N2 - 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.

AB - 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.

KW - Condensed Matter - Quantum Gases

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DO - 10.1103/PhysRevA.103.L031301

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EP - 7

JO - Physical Review A

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Flat band induced non-Fermi liquid behavior of multicomponent fermions

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Flat bands and disorder: Flat bands and disorder

Peotta Sebastiano AT-kulut

Long-range coherence in nanosystems

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Science-IT

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