Journal
PHYSICAL REVIEW B
Volume 85, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.075125
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Funding
- ARO [W911NF-07-1-0576]
- NSF [DMR-0757145, DMR-0705472]
- MEXT of Japan [20654030, 20102008]
- Grants-in-Aid for Scientific Research [20102008, 20654030] Funding Source: KAKEN
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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-S Haldane phase is a topologically nontrivial phase which is protected by any one of the following three global symmetries: (i) the dihedral group of p rotations about the x, y, and z axes, (ii) time-reversal symmetry S-x,S-y,S-z -> -S-x,S-y,S-z,S- and (iii) link inversion symmetry (reflection about a bond center), consistent with previous results [Phys. Rev. B 81, 064439 (2010)]. On the other hand, an even-S 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.
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