Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-06-10
Phys. Rev. B 67, 100409(R) (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 6 figures, REVTeX 4, published version
Scientific paper
10.1103/PhysRevB.67.100409
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.
Laeuchli Andreas
Schmid Gerhard
Troyer Matthias
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