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- W4311532718 abstract "We investigate the local moment formation in the half-filled $mathrm{SU}(N$) Hubbard model under a staggered ionic potential. As the Hubbard $U$ increases, the charge fluctuations are suppressed and eventually frozen when $U$ is above a critical value ${U}_{c}$, marking the development of well-defined local moment with integer $m$ fermions on the A sublattice and $(Nensuremath{-}m)$ fermions on the B sublattice, respectively. We obtain an analytical solution for ${U}_{c}$ for the paramagnetic ground state within the variational Gutzwiller approximation and renormalized mean field theory. For large $N$, ${U}_{c}$ is found to depend on $N$ linearly with fixed $m/N$, but sublinearly with fixed $m$. The local moment formation is accompanied by a peculiar phase transition from the band insulator to the Mott insulator, where the ionic potential and quasiparticle weight are renormalized to zero simultaneously. Inside the Mott phase, the low-energy physics is described by the $mathrm{SU}(N$) Heisenberg model with conjugate representations, which is widely studied in the literature." @default.
- W4311532718 created "2022-12-26" @default.
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- W4311532718 date "2022-12-09" @default.
- W4311532718 modified "2023-10-18" @default.
- W4311532718 title "Transition from band insulator to Mott insulator and formation of local moment in the half-filled ionic <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mi>N</mml:mi><mml:mo>)</mml:mo></mml:math> Hubbard model" @default.
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- W4311532718 doi "https://doi.org/10.1103/physrevb.106.245113" @default.
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