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cond-mat.str-el2002
On the correllation effect in Peierls-Hubbard chains
J. Malek, S. -L. Drechsler, S. Flach +2
We reexamine the dimerization, the charge and the spin gaps of a half-filled Peierls-Hubbard chain by means of the incremental expansion technique. Our numerical findings are in si…
cond-mat.str-el1999
On some upper bounds for spin velocity and instability of gapless state of 1-d Heisenberg chains
Konstantin Kladko
We derive upper bounds for spin velocity in half-integer-spin Heisenberg antiferromagnetic chains. We relate these upper bounds to the instability of the gapless state, which is ob…