Theoretical Solid State Physics

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Deconfined quantum critical point in SU(3) antiferromagnets on the triangular lattice

Dimitri Pimenov

15.12.2016 at 12:15 

Deconfined criticality is a concept that has emerged in recent years to describe quantum phase transitions outside the Landau-Ginzburg paradigm. In short, continuous transitions between two symmetry broken phases of SU(2) Heisenberg antiferromagnets (Neel and valence bond solid) are driven by condensation of topological defects, which are described by appropriate gauge theories. We try to elevate this concept to SU(3) antiferromagnets on the triangular lattice. We formulate an action derived from the Neel side, and study its critial properties by performing an FRG-study in a large N limit. A critical fixed point is found, suggesting a continuous phase transition. We also comment on the nature of topological defects on the VBS side.

A 450, Theresienstr. 37