Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions
Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions
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DOI：
10.1103/physreva.103.l031301
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发表时间：
2020-05
影响因子：
2.9
通讯作者：
Pramod Kumar;S. Peotta;Y. Takasu;Y. Takahashi;P. Törmä
中科院分区：
文献类型：
--
作者：
Pramod Kumar;S. Peotta;Y. Takasu;Y. Takahashi;P. Törmä
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 N\'eel temperature and persists even in the presence of a trapping potential, thus they are observable in current ultracold gas experiments.
