Fig. 4: Properties of a quarter-filled SSHH model with OBC.
From: Topological phases of a dimerized Fermi–Hubbard model for semiconductor nano-lattices
a Eigenenergy spectrum in the strongly correlated regime (U = 10), colored according to the spin ∣Sz∣ of the eigenstates. For each value of Sz the 40 lowest energies are shown. b An illustration of the particle occupation at each site and the long-range AFM correlation between the electron’s spins in the non-trivial phase. Each dimer in the middle of the chain is occupied by an electron, and the two edges are shared by one electron. c Spin correlation \(\left\langle {S}_{z,j}{S}_{z,k}\right\rangle\) in the non-trivial phase (Δt = 0.5). The abscissa and ordinate are the “effective sites” j and k defined as illustrated in b: The first and the last value refers to the two edges, while each value in between refers to each bulk dimer which is occupied by a single electron; d same as c for Δt = 0; and e same as d for Δt = −0.5. The long-range AFM correlation persists for all values of Δt.
