Quantum destruction of spiral order in two-dimensional frustrated magnets

Bhattacharjee, Subhro (2011) Quantum destruction of spiral order in two-dimensional frustrated magnets. In: Physical Review B: Condensed Matter and Materials Physics, 84 (10).

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Abstract

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 Z(2) character. Previous works established that a nontrivial quantum spin-liquid phase results when the spiral is disordered without proliferating the Z(2) 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.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 Sep 2011 11:34
Last Modified:	29 Sep 2011 11:34
URI:	http://eprints.iisc.ac.in/id/eprint/41005

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