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[en] The topological classification of a series of frustration-induced spin-gap phases in the spin-1/2 ferromagnetic–antiferromagnetic alternating Heisenberg chain with next-nearest-neighbour interaction reported in J. Phys. Soc. Jpn. 82, 064703 (2013) is confirmed using two kinds of entanglement spectra defined by different divisions of the whole chain. For the numerical calculation, the iDMRG method is used. The results are consistent with the valence bond solid picture proposed in the previous paper. (author)
Journal
Journal of the Physical Society of Japan; ISSN 0031-9015; 
; v. 85(2); p. 024705.1-024705.3
; v. 85(2); p. 024705.1-024705.3