Contractor-Renormalization approach to frustrated magnets in magnetic field

Details Contractor-Renormalization approach to frustrated magnets in magnetic field Contractor-Renormalization approach to frustrated magnets in magnetic field

2007-03-22

arxiv.org/abs/cond-mat/0703586v2

Phys. Rev. B 76, 064413 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 20 figures; published version with minor changes

Scientific paper

10.1103/PhysRevB.76.064413

We propose to use the Contractor Renormalization (CORE) technique in order to derive effective models for quantum magnets in a magnetic field. CORE is a powerful non-perturbative technique that can reduce the complexity of a given microscopic model by focusing on the low-energy part. We provide a detailed analysis of frustrated spin ladders which have been widely studied in the past: in particular, we discuss how to choose the building block and emphasize the use of their reduced density matrix. With a good choice of basis, CORE is able to reproduce the existence or not of magnetization plateaux in the whole phase diagram contrary to usual perturbation theory. We also address the issue of plateau formation in two-dimensional bilayers and point out the analogy between non-frustrated strongly anisotropic models and frustrated SU(2) ones.

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