Quantum Destruction of Spiral Order in Two Dimensional Frustrated Magnets

Details Quantum Destruction of Spiral Order in Two Dimensional Frustrated Magnets Quantum Destruction of Spiral Order in Two Dimensional Frustrated Magnets

2010-11-22

arxiv.org/abs/1011.4827v2

Phys Rev B, 84, 104430 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages (Extended and appendix added)

Scientific paper

10.1103/PhysRevB.84.104430

We study the fate of spin-1/2 spiral-ordered two-dimensional quantum antiferromagnets that are disordered by quantum fluctuations. A crucial role is played by the topological point defects of the spiral phase, which are known to have a Z2 character. Previous works established that a nontrivial quantum spin-liquid phase results when the spiral is disordered without proliferating the Z2 vortices. Here, we show that when the spiral is disordered by proliferating and condensing these vortices, valence-bond solid ordering occurs due to quantum Berry phase effects. We develop a general theory for this latter phase transition and apply it to a lattice model. This transition potentially provides a new example of a Landau-forbidden deconfined quantum critical point.

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