Exotic gapless spectrum induced by frustration in quantum antiferromagnets

Details Exotic gapless spectrum induced by frustration in quantum antiferromagnets Exotic gapless spectrum induced by frustration in quantum antiferromagnets

2007-01-26

arxiv.org/abs/cond-mat/0701658v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages and 4 figures

Scientific paper

10.1103/PhysRevB.76.060401

We show strong numerical evidence in favor of an unexpected virtually gapless spectrum, with edge states localized at the boundaries, in frustrated spin-1/2 antiferromagnetic ladders with an odd number of legs. These features can be accurately reproduced by using a projected BCS wave function with a non-trivial pairing, that mixes even and odd reflection symmetries. This approach gives the correct classification of the excitations and provides a simple and very appealing picture of an unconventional spin-liquid phase stabilized by frustration.

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