Ground-state fidelity and tensor network states for quantum spin tubes

Details Ground-state fidelity and tensor network states for quantum spin tubes Ground-state fidelity and tensor network states for quantum spin tubes

2011-05-16

arxiv.org/abs/1105.3014v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures

Scientific paper

An efficient algorithm is developed for quantum spin tubes in the context of the tensor network representations. It allows to efficiently compute the ground-state fidelity per lattice site, which in turn enables us to identify quantum critical points, at which quantum spin tubes undergo quantum phase transitions. As an illustration, we investigate the isosceles spin 1/2 antiferromagnetic three-leg Heisenberg tube. Our simulation results suggest that two Kosterlitz-Thouless transitions occur as the degree of asymmetry of the rung interaction is tuned, thus offering an alternative route towards a resolution to the conflicting results on this issue arising from the density matrix renormalization group.

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