Gordon Godfrey Theoretical Seminar 2006
Spin
Nematic Phases in 2D Quantum Magnets
Dr.
Andreas Lauchli,
IRRMA
- EPF Lausanne - Switzerland
Date
12 pm, Tuesday, 9 May, 2006
School of Physics,
Room 5
Abstract:
In this talk I will review some recent numerical work on the search
of spin nematic phases in two dimensional quantum antiferromagnets with
ring exchange or biquadratic exchange interactions. The first model
consists of competing Heisenberg and ring exchange interactions and
sustains a phase with ordered spin currents, in the absence of an ordered
magnetic moment. The second system consists of interacting S=1 spins
on a triangular lattice with biquadratic exchange. Here we find spin
quadrupolar phases of different spatial structure. The possible relevance
of this model to the magnetism of NiGa2S4 will
be explored.
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