paper

Symmetry protection of topological order in one-dimensional quantum spin systems

arXiv:0909.4059 · doi:10.1103/PhysRevB.85.075125

Abstract

We discuss the characterization and stability of the Haldane phase in integer spin chains on the basis of simple, physical arguments. We find that an odd- Haldane phase is a topologically non-trivial phase which is protected by any one of the following three global symmetries: (i) the dihedral group of -rotations about and axes; (ii) time-reversal symmetry ; (iii) link inversion symmetry (reflection about a bond center), consistently with previous results [Phys. Rev. B \textbf{81}, 064439 (2010)]. On the other hand, an even- Haldane phase is not topologically protected (i.e., it is indistinct from a trivial, site-factorizable phase). We show some numerical evidence that supports these claims, using concrete examples.

9 pages, 6 figures, extended version: several new examples and numerical results added. Journal reference added

References in corpus (18)

Cited by in corpus (593)