Structure-dependent metal–insulator transition in one-dimensional Hubbard superlattice*
Zhang Liang-Liang†a), Huang Jina), Duan Cheng-Bob), Wang Wei-Zhonga)
       
Spin correlation S ( i , i + r ) between the nearest neighboring repulsive sites as a function of U for (a) even L 0 and (b) odd L 0. The dashed lines correspond to the spin correlation between (a) the nearest neighboring sites and (b) the next nearest neighboring sites in the 1D Hubbard model. ε = −U/2.