2008/07/18 by I. Maruyama, Isao Maruyama, T. Hirano +3
Chemistry · Mathematics · Physics and Astronomy · #Advanced NMR Techniques and Applications #Algebraic structures and combinatorial models #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1088/1742-6596/145/1/012052
4 pages, 3 figures
arxiv created 2008/07/18 · openalex publication_date 2009/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
A spin-1/2 frustrated two-leg ladder with four-spin exchange interaction is studied by quantized Berry phases. We found that the Berry phase successfully characterizes the Haldane phase in addition to the rung-singlet phase, and the dominant vector-chirality phase. The Hamiltonian of the Haldane phase is topologically identical to the S=1 antiferromagnetic Heisenberg chain. Decoupled models connected to the dominant vector-chirality phase revealed that the local object identified by the non-trivial (π) Berry phase is the direct product of two diagonal singlets.