Zero energy Majorana modes in spin ladders and a possible realization of the Kitaev model

Details Zero energy Majorana modes in spin ladders and a possible realization of the Kitaev model Zero energy Majorana modes in spin ladders and a possible realization of the Kitaev model

2011-05-29

arxiv.org/abs/1105.5835v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

We show that in double-chain Mott insulators (ladders), disordered alternating ionic potentials may locally destroy coherence of magnetic excitations and lead to the appearance of spontaneously dimerized islands inside the Haldane spin-liquid phase. We argue that a boundary between the dimerized and Haldane phases of a spin-1/2 ladder supports a localized zero-energy Majorana fermion mode. Based on these findings we suggest a realization of a generalized Kitaev model where Majorana fermions can propagate in more than one dimension.

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