Phase diagram of the two-chain Hubbard model

Abstract

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.

4 pages, 6 figures, to appear in PRB

References in corpus (2)

• The N-chain Hubbard Model in Weak Coupling
• Enhanced d_{x^2-y^2} pairing correlations in the two-leg Hubbard ladder

Cited by in corpus (7)

• New Trends in Density Matrix Renormalization
• Numerical Studies of the two-leg Hubbard ladder
• Orbital current patterns in doped two-leg Cu-O Hubbard ladders
• Renormalization Group calculations with k|| dependent couplings in a ladder
• Possible phases of two coupled n-component fermionic chains
• Charge density plateaux and insulating phases in the $t-J$ model with ladder geometry
• Charge and spin dynamics of the Hubbard chains