論文

査読有り
2015年11月3日

Magnetization plateaus of an easy-axis kagome antiferromagnet with extended interactions

Physical Review B - Condensed Matter and Materials Physics
  • X. Plat
  • ,
  • F. Alet
  • ,
  • S. Capponi
  • ,
  • K. Totsuka

92
17
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.92.174402
出版者・発行元
American Physical Society

We investigate the properties in finite magnetic field of an extended anisotropic XXZ spin-1/2 model on the kagome lattice, originally introduced by Balents, Fisher, and Girvin [Phys. Rev. B 65, 224412 (2002)PRBMDO0163-182910.1103/PhysRevB.65.224412]. The magnetization curve displays plateaus at magnetization m=1/6 and 1/3 when the anisotropy is large. Using low-energy effective constrained models (quantum loop and quantum dimer models), we discuss the nature of the plateau phases, found to be crystals that break discrete rotation and/or translation symmetries. Large-scale quantum Monte Carlo simulations were carried out in particular for the m=1/6 plateau. We first map out the phase diagram of the effective quantum loop model with an additional loop-loop interaction to find stripe order around the point relevant for the original model as well as a topological Z2 spin liquid. The existence of a stripe crystalline phase is further evidenced by measuring both standard structure factor and entanglement entropy of the original microscopic model.

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.92.174402
ID情報
  • DOI : 10.1103/PhysRevB.92.174402
  • ISSN : 1550-235X
  • ISSN : 1098-0121
  • SCOPUS ID : 84948471406

エクスポート
BibTeX RIS