Phase structure of Z{sub 2} gauge theories for frustrated antiferromagnets in two dimensions
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Department of Applied Physics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
In this paper, we study phase structure of Z{sub 2} lattice gauge theories that appear as an effective-field theory describing low-energy properties of frustrated antiferromagnets in two dimensions. Spin operators are expressed in terms of Schwinger bosons, and an emergent U(1) gauge symmetry reduces to a Z{sub 2} gauge symmetry as a result of condensation of a bilinear operator of the Schwinger boson describing a short-range spiral order. We investigated the phase structure of the gauge theories by means of the Monte Carlo simulations, and found that there exist three phases, phase with a long-range spiral order, a dimer state, and a spin liquid with deconfined spinons. Detailed phase structure and properties of phase transitions depend on details of the models.
- OSTI ID:
- 21287117
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 80; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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