Charge and spin dynamics of the Hubbard chains

Details Charge and spin dynamics of the Hubbard chains Charge and spin dynamics of the Hubbard chains

1999-07-27

arxiv.org/abs/cond-mat/9907420v1

Physics

Condensed Matter

Strongly Correlated Electrons

19 latex pages, 9 figures

Scientific paper

10.1016/S0921-4534(99)00522-5

We calculate the local correlation functions of charge and spin for the one-chain and two-chain Hubbard model using the density matrix renormalization group method and the recursion technique. Keeping only finite number of states we get good accuracy for the low energy excitations. We study the charge and spin gaps, bandwidths and weights of the spectra for various values of the on-site Coulomb interaction U and the electron filling. In the low energy part, the local correlation functions are different for the charge and spin. The bandwidths are proportional to t for the charge and J for the spin, respectively.

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