XY ring-exchange model on the triangular lattice

Details XY ring-exchange model on the triangular lattice XY ring-exchange model on the triangular lattice

2002-12-24

arxiv.org/abs/cond-mat/0212589v2

Phys. Rev. B 67, 133427 (2003)

Physics

Condensed Matter

Superconductivity

9 pgs (RevTeX), 4 figs

Scientific paper

10.1103/PhysRevB.67.134427

We study ring-exchange models for bosons or XY-spins on the triangular lattice. A four-spin exchange leads to a manifold of ground states with gapless excitations and critical power-law correlations. With a nearest-neighbour exchange, fluctuations select a four-fold ferrimagnetically ordered ground state with a small spin/superfluid stiffness which breaks the global U(1) and translational symmetry. We explore consequences for phase transitions at finite temperature and in an in-plane magnetic field.

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