Two Step Restoration of SU(2) Symmetry in a Frustrated Ring-Exchange Magnet

Details Two Step Restoration of SU(2) Symmetry in a Frustrated Ring-Exchange Magnet Two Step Restoration of SU(2) Symmetry in a Frustrated Ring-Exchange Magnet

2004-12-01

arxiv.org/abs/cond-mat/0412035v2

Phys. Rev. Lett. 95, 137206 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.95.137206

We demonstrate the existence of a spin-nematic, moment-free phase in a quantum four-spin ring exchange model on the square lattice. This unusual quantum state is created by the interplay of frustration and quantum fluctuations which lead to a partial restoration of SU(2) symmetry when going from a four-sublattice orthogonal biaxial Neel order to this exotic uniaxial magnet. A further increase of frustration drives a transition to a fully gapped SU(2) symmetric valence bond crystal.

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