Scaling of excitations in dimerized and frustrated spin-1/2 chains

Details Scaling of excitations in dimerized and frustrated spin-1/2 chains Scaling of excitations in dimerized and frustrated spin-1/2 chains

2005-03-22

arxiv.org/abs/cond-mat/0503539v3

Phys. Rev. B 72, 172409 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 eps figures, RevTeX 4 class, same version as in PRB

Scientific paper

10.1103/PhysRevB.72.172409

We study the finite-size behavior of the low-lying excitations of spin-1/2 Heisenberg chains with dimerization and next-to-nearest neighbors interaction, J_2. The numerical analysis, performed using density-matrix renormalization group, confirms previous exact diagonalization results, and shows that, for different values of the dimerization parameter \delta, the elementary triplet and singlet excitations present a clear scaling behavior in a wide range of \ell=L/\xi (where L is the length of the chain and \xi is the correlation length). At J_2=J_2c, where no logarithmic corrections are present, we compare the numerical results with finite-size predictions for the sine-Gordon model obtained using Luscher's theory. For small \delta we find a very good agreement for \ell > 4 or 7 depending on the excitation considered.

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