Low-lying excitations of the three-leg spin tube using the density-matrix renormalization group method

Details Low-lying excitations of the three-leg spin tube using the density-matrix renormalization group method Low-lying excitations of the three-leg spin tube using the density-matrix renormalization group method

2008-06-15

arxiv.org/abs/0806.2474v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 8 figures

Scientific paper

10.1103/PhysRevB.78.054421

Using the (dynamical) density-matrix renormalization group method, we study the low-energy physics of three-leg antiferromagnetic Heisenberg model where the periodic boundary conditions are applied in the rung direction. We confirm that the spin excitations are always gapped as long as the intra-ring couplings form a regular triangle. From precise finite-size-scaling analyses of the spin gap and dimerization order parameter, we also find that the spin gap is collapsed by very small asymmetric modulation of the intra-ring couplings. Moreover, the dynamical spin structure factors on the intra- and inter-leg correlations are calculated. It is demonstrated that the low-lying structure of the inter-leg spectra is particularly affected by the asymmetric modulation.

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