Quantum phase transition in easy-axis antiferromagnetic integer-spin chains

Details Quantum phase transition in easy-axis antiferromagnetic integer-spin chains Quantum phase transition in easy-axis antiferromagnetic integer-spin chains

2003-07-11

arxiv.org/abs/cond-mat/0307266v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

Antiferromagnetic Heisenberg integer-spin chains are characterized by a spin-liquid ground state with no long-range order, due to the relevance of quantum fluctuations. Spin anisotropy, however, freezes quantum fluctuations, and the system is magnetized in the presence of a sufficiently large easy-axis anisotropy. We numerically investigate the case S=1, by means of the density-matrix renormalization group, and find that the freezing of the spin liquid into a N\'eel spin solid, with increasing easy-axis anisotropy, is a continuous quantum phase transition. Numerical evidence indicates that the transition is not in the two-dimensional Ising universality class.

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