Ground State of a Heisenberg Chain with Next-Nearest-Neighbor Bond Alternation

Details Ground State of a Heisenberg Chain with Next-Nearest-Neighbor Bond Alternation Ground State of a Heisenberg Chain with Next-Nearest-Neighbor Bond Alternation

2003-04-12

arxiv.org/abs/cond-mat/0304302v1

Physics

Condensed Matter

Strongly Correlated Electrons

Four pages, to be published on Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.172404

We investigate the ground-state properties of the spin-half $J_1{-}J_2$ Heisenberg chain with a next-nearest-neighbor spin-Peierls dimerization using conformal field theory and Lanczos exact diagonalizations. In agreement with the results of a recent bosonization analysis by Sarkar and Sen, we find that for small frustration ($J_2/J_1$) the system is in a Luttinger spin-fluid phase, with gapless excitations, and a finite spin-wave velocity. In the regime of strong frustration the ground state is spontaneously dimerized and the bond alternation reduces the triplet gap, leading to a slight enhancement of the critical point separating the Luttinger phase from the gapped one. An accurate determination of the phase boundary is obtained numerically from the study of the excitation spectrum.

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