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We study a one-dimensional SU(N) Hubbard model with an attractive on-siteinteraction and $N>2$ at half-filling on the bipartite lattice usingdensity-matrix renormalization-group method and a perturbation theory. We findthat the ground state of the SU(N) Hubbard model is a charge density wave statewith two-fold degeneracy. All the excitations are found to be gapful, resultingin an insulating ground state, on contrary to that in the SU(2) case. Moreover,the charge gap is equal to the Cooperon gap, which behaves as $-2Nt^2/(N-1)U$in the strong coupling regime. However, the spin gap $\Delta_{s}$ and thequasiparticle gap $\Delta_{1}$ as well open exponentially in the weak couplingregion, while in the strong coupling region, they linearly depend on $U$ suchthat $\Delta_{s}\sim -U(N-1)$ and $\Delta_{1}\sim -U(N-1)/2$.Comment: 7 pages, 7 figure

Insulating Charge Density Wave for a Half-Filled SU(N) Hubbard Model with an Attractive On-Site Interaction in One Dimension