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

Fysiikka

Tutkimustuotos: Kirje › Tieteellinen › vertaisarvioitu

8 Sitaatiot (Scopus)

9 Lataukset (Pure)

Abstrakti

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.

Alkuperäiskieli	Englanti
Artikkeli	L031301
Sivumäärä	7
Julkaisu	Physical Review A
Vuosikerta	103
Numero	3
DOI - pysyväislinkit	https://doi.org/10.1103/PhysRevA.103.L031301
Tila	Julkaistu - maalisk. 2021
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Julkaisufoorumi-taso

Jufo-taso 2

!!ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Pääsy asiakirjaan

10.1103/PhysRevA.103.L031301

Flat-band-induced non-Fermi-liquid
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Final published version, 958 KBLisenssi: Unspecified

https://urn.fi/URN:NBN:fi:tuni-202201211496Lisenssi: Unspecified

Siteeraa tätä

@article{474f568c2bf040b195a432a0f0a9f4e0,

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.",

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

note = "Funding Information: Acknowledgments. We thank T. I. Vanhala for useful discussions. This work was supported by the Academy of Finland under Projects No. 330384, No. 303351, No. 307419, No. 327293, and No. 318987 (QuantERA project RouTe), by the Grant-in-Aid for Scientific Research of the Ministry of Education, Culture Sports, Science, and Technology, Japan Society for the Promotion of Science (MEXT/JSPS KAKENHI, No. JP17H06138, No. JP18H05405, and No. JP18H05228), Japan Science and Technology Agency CREST (No. JPMJCR1673), and by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP, No. JPMXS0118069021). Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = mar,

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

language = "English",

volume = "103",

journal = "Physical Review A",

issn = "2469-9926",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions

AU - Kumar, Pramod

AU - Peotta, Sebastiano

AU - Takasu, Yosuke

AU - Takahashi, Yoshiro

AU - Törmä, Päivi

N1 - Funding Information: Acknowledgments. We thank T. I. Vanhala for useful discussions. This work was supported by the Academy of Finland under Projects No. 330384, No. 303351, No. 307419, No. 327293, and No. 318987 (QuantERA project RouTe), by the Grant-in-Aid for Scientific Research of the Ministry of Education, Culture Sports, Science, and Technology, Japan Society for the Promotion of Science (MEXT/JSPS KAKENHI, No. JP17H06138, No. JP18H05405, and No. JP18H05228), Japan Science and Technology Agency CREST (No. JPMJCR1673), and by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP, No. JPMXS0118069021). Publisher Copyright: © 2021 American Physical Society.

PY - 2021/3

Y1 - 2021/3

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.

U2 - 10.1103/PhysRevA.103.L031301

DO - 10.1103/PhysRevA.103.L031301

M3 - Letter

AN - SCOPUS:85102885773

SN - 2469-9926

VL - 103

JO - Physical Review A

JF - Physical Review A

IS - 3

M1 - L031301

ER -

Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions

Abstrakti

Julkaisufoorumi-taso

!!ASJC Scopus subject areas

Pääsy asiakirjaan

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