The One-Dimensional Hubbard Model for Large or Infinite-U

摘要: The magnetic properties of the one-dimensional Hubbard model with a hardcore interaction on ring (periodic boundary conditions) are investigated. At finite temperatures it is shown to behave up exponentially small corrections as pure paramagnet. An explicit expression for ground-state degeneracies derived. eigenstates this used perform perlurbational treatment large but interactions. In first order inU1 an effective Hamiltonian It Hcisenberg antiferromagnetic couplings between nearest neighbor spins. asymptotic expansion energy given. results valid arbitrary densities electrons.