A schematic phase diagram for organic chain length

• (a) A schematic phase diagram for organic chain length, L=20 chains, at two different temperatures, T=0.001t and T=0.002t.
• (b) The dimerization parameter D as a function of a/t and U/t for the chain length L=10 site chain (at T=0.001t ).

a: the Hubbard repulsion strength
U: the hyperfine exchange
t: the nearest neighbour hopping constant