Staggered dimer order and criticality in an S=1/2 quantum spin ladder system with four-spin exchange

Keigo Hijii, Shaojin Qin, Kiyohide Nomura

研究成果: Contribution to journalArticle査読

23 被引用数 (Scopus)

抄録

We study an S=1/2 quantum-spin ladder system with four-spin cyclic exchange, using the density matrix renormalization group (DMRG) and exact diagonalization methods. Recently, the phase transition and its universality class in this system have been studied. However, controversies remain on whether the phase transition is second-order type or another type and on the nature of critical phenomena. In addition, there are several arguments concerning where the transition point is. Analyzing DMRG data, we use an approach to determine the ordered phase which appears after the phase transition. We find that the edge state appears under the open boundary condition by investigating excitation energies of states with higher magnetizations. We also estimate the correlation length and discuss the critical behavior.

本文言語英語
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
68
13
DOI
出版ステータス出版済み - 2003

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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