2003/04/04 by Tsutomu Momoi, Toshiya Hikihara, Masaaki Nakamura +1
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced NMR Techniques and Applications #Physics of Superconductivity and Magnetism #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.67.174410
published as Phys. Rev. B 67, 174410 (2003) · 8 pages, 2 figures, to appear in Phys. Rev. B
arxiv created 2003/04/04 · openalex publication_date 2003/05/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that scalar chiral order can be induced by four-spin exchanges in the two-leg spin ladder, using the spin-chirality duality transformation and matrix-product ansatz. Scalar-chiral-ordered states are found to be exact ground states in a family of spin ladder models. In this scalar chiral phase, there is a finite energy gap above the doubly degenerate ground states and a Z2\ifmmode×\else\texttimes\fiZ2\ifmmode×\else\texttimes\fiZ2 symmetry is fully broken. It is also shown that the SU(4)-symmetric model, which is self-dual under the duality transformation, is on a multicritical point surrounded by the staggered dimer phase, the staggered scalar chiral phase, and the gapless phase.