Possibility of deconfined criticality in SU(N) Heisenberg models at small N

Kenji Harada, Takafumi Suzuki, Tsuyoshi Okubo, Haruhiko Matsuo, Jie Lou, Hiroshi Watanabe, Synge Todo, Naoki Kawashima

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

To examine the validity of the scenario of the deconfined critical phenomena, we carry out a quantum Monte Carlo simulation for the SU(N) generalization of the Heisenberg model with four-body and six-body interactions. The quantum phase transition between the SU(N) Néel and valence-bond solid phases is characterized for N=2, 3, and 4 on the square and honeycomb lattices. While finite-size scaling analysis works well up to the maximum lattice size (L=256) and indicates the continuous nature of the phase transition, a clear systematic change towards the first-order transition is observed in the estimates of the critical exponent y≡1/ν as the system size increases. We also confirm the relevance of a squared valence-bond solid field Ψ2 for the SU(3) model.

Original languageEnglish
Article number220408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number22
DOIs
Publication statusPublished - 2013 Dec 13
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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