Binding of holes in one-dimensional Hubbard chains.

摘要: Using the Bethe ansatz, we calculate binding energies of two holes just off half-filling in one-dimensional Hubbard chains. Somewhat surprisingly, find comparable to that seen two-dimensional systems chains have a degeneracy at Fermi level noninteracting ({ital U}=0) limit. The initially IincreasesR with lattice size before beginning slow decay zero thermodynamic We discuss general implications our results for energy and other numerical calculations high-{Tc} models.