Quantum destruction of spiral order in two-dimensional frustrated magnets


Autoria(s): Bhattacharjee, Subhro
Data(s)

15/09/2011

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/41005/1/prb_84_2011_104430.pdf

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

Publicador

The American Physical Society

Relação

http://prb.aps.org/abstract/PRB/v84/i10/e104430

http://eprints.iisc.ernet.in/41005/

Palavras-Chave #Physics
Tipo

Journal Article

PeerReviewed