Effect of a Symmetry-Breaking Field on the Ground State of the Spin-1/2 Antiferromagnetic Linear Chain

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概要

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• We investigate the ground-state property of the one-dimensional spin-1/2 antiferromagnetic XXZ chain in a symmetry-breaking field, by means of numerical diagonalization method for finite-size spin systems combined with the phenomenological renormalization group method. It is found that, with increasing field, there occurs the ground-state phase transition from an ordered phase to a disordered phase, whose critical property belongs to the universality class of the transverse Ising model. The ground-state phase diagram is determined in two parameter regions ; (i) an Ising-like region and (ii) an XY-like region. Our inspection of the field dependence of the energy gap and the static spin structure factors reveals that the ordered phase in both regions exhibits the characteristics of Neel order. Quantum nature of the ground state is also briefly discussed.

• 社団法人日本物理学会の論文
• 1995-09-15

著者

• Harada I

  Okayama Univ. Okayama

• Harada Isao

  Department Of Physics Faculty Of Science Okayama University

• Harada Isao

  Institute For Solid State Physics University Of Tokyo

• Harada Isao

  Department Of Physics Faculty Of Science Kobe University

• Kim J‐j

  Korea Res. Inst. Standards And Sci. Taejon Kor

• Kim Jong-jae

  Department Of Physics Catholic University Of Taegu-hyosung:department Of Physics Faculty Of Science

• MORI Shigeyoshi

  Department of Physics,Fukuyama University

• Mori Shigeyoshi

  Department Of Physics Faculty Of Science Okayama University:department Of Physics Fukuyama Universit

• Mori Shigeyoshi

  Department Of Physics Faculty Of Science Okayama University

• Kim Jong-jae

  Department Of Physics Catholic University Of Taegu-hyosung

• HARADA Isao

  Department of Physics, Kobe University : Department of Physics, Okayama University

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