Valence-bond theory of highly disordered quantum antiferromagnets

Details Valence-bond theory of highly disordered quantum antiferromagnets Valence-bond theory of highly disordered quantum antiferromagnets

2008-10-17

arxiv.org/abs/0810.3043v2

Europhys. Lett. 87, 27003 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 eps figures

Scientific paper

10.1209/0295-5075/87/27003

We present a large-N variational approach to describe the magnetism of insulating doped semiconductors based on a disorder-generalization of the resonating-valence-bond theory for quantum antiferromagnets. This method captures all the qualitative and even quantitative predictions of the strong-disorder renormalization group approach over the entire experimentally relevant temperature range. Finally, by mapping the problem on a hard-sphere fluid, we could provide an essentially exact analytic solution without any adjustable parameters.

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