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Bond operator mean field approach to the magnetization plateaux in quantum antiferromagnets - Application to the S=1/2 coupled dimerized zigzag Heisenberg chains

Authors
Journal
Journal of the Physical Society of Japan
0031-9015
Publisher
Physical Society of Japan
Publication Date
Keywords
  • Zigzag Heisenberg Chain
  • Dimerization
  • Magnetization Plateau
  • Bond Operator Mean Field Approximation

Abstract

The magnetization plateaux in two dimensionally coupled S = 1/2 dimerized zigzag Heisenberg chains are investigated by means of the bond operator mean field approximation. In the absence of the interchain coupling, this model is known to have a plateau at half of the saturation magnetization accompanied by the spontaneous translational symmetry breakdown. The parameter regime in which the plateau appears is reproduced well within the present approximation. In the presence of the interchain coupling, this plateau is shown to be suppressed. This result is also supported by the numerical diagonalization calculation.

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