Phase diagram of a spin ladder with cyclic four-spin exchange

2002/06/30 by Andreas M. Läuchli, A. Laeuchli, G. Schmid +3 · 9 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum many-body systems #Theoretical and Computational Physics #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.67.100409

published as Phys. Rev. B 67, 100409(R) (2003) · 4 pages, 6 figures, REVTeX 4, published version

openalex publication_date 2003/03/31 · arxiv created 2003/04/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present the phase diagram of the S=1/2 Heisenberg model on the two leg ladder with cyclic four-spin exchange, determined by a combination of exact diagonalization and density-matrix renormalization group techniques. We find six different phases and regimes: the rung singlet phase, a ferromagnetic phase, two symmetry broken phases with staggered dimers and staggered scalar chiralities, and a gapped region with dominant vector chirality, or collinear spin correlations. We localize the phase transitions and investigate their nature.

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