A. Painelli et A. Girlando, ELECTRON-ELECTRON AND ELECTRON-PHONON INTERACTIONS IN 1D HALF-FILLED CHAINS - PHASE-DIAGRAM, Synthetic metals, 57(2-3), 1993, pp. 4543-4548
Diagrammatic valence bond calculations are performed on finite size ex
tended Hubbard rings with alternating on-site or on-bond energies. In
the adiabatic approximation we then draw the phase diagram of the half
-filled Hubbard chain in the presence of both site-diagonal and bond-d
iagonal electron-phonon coupling.