Phase diagram of the two-chain Hubbard model

Details Phase diagram of the two-chain Hubbard model Phase diagram of the two-chain Hubbard model

1998-11-19

arxiv.org/abs/cond-mat/9811280v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures, to appear in PRB

Scientific paper

10.1103/PhysRevB.59.2587

We have calculated the charge gap and spin gap for the two-chain Hubbard model as a function of the on-site Coulomb interaction and the interchain hopping amplitude. We used the density matrix renormalization group method and developed a method to calculate separately the gaps numerically for the symmetric and antisymmetric modes with respect to the exchange of the chain indices. We have found very different behaviors for the weak and strong interaction cases. Our calculated phase diagram is compared to the one obtained by Balents and Fisher using the weak coupling renormalization group technique.

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