Nonlocal Unitary Transformation and Haldane State in S =1/2 Antiferromagnetic Ladder Model

Satoshi Takada, Hiroshi Watanabe

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

The Haldane state is investigated in the 5=1/2 antiferromagnetic (AF) ladder model for open chains with the help of a nonlocal unitary transformation. It is shown that the transformation works well, as in the case of 5=1 AF models, so that it transforms the model into a ferromagnetic model with Z2 × Z2 symmetry, and four degenerate Haldane states are obtained by a variational calculation in a molecular field approximation. The 5=1/2 edge states are examined in these Haldane states.

Original languageEnglish
Pages (from-to)39-42
Number of pages4
JournalJournal of the Physical Society of Japan
Volume61
Issue number1
DOIs
StatePublished - 1 Jan 1992

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