Contractor-Renormalization approach to frustrated magnets in magnetic field

Abstract

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.

13 pages, 20 figures; published version with minor changes

References in corpus (4)

• Supersolids versus phase separation in two-dimensional lattice bosons
• Magnetization plateaus in frustrated antiferromagnetic quantum spin models
• Quantum and thermal transitions out of the supersolid phase of a 2D quantum antiferromagnet
• Numerical Contractor Renormalization Method for Quantum Spin Models

Cited by in corpus (2)

• Mechanisms for Spin-Supersolidity in S=1/2 Spin-Dimer Antiferromagnets
• Engineering exotic phases for topologically-protected quantum computation by emulating quantum dimer models