SU(4) spin-orbit critical state in one dimension

Yasufumi Yamashita, Naokazu Shibata, Kazuo Ueda

研究成果: Article査読

107 被引用数 (Scopus)

抄録

Effect of quantum fluctuations concerned with the orbital degrees of freedom is discussed for the model with SU(4) symmetry in one dimension. An effective Hamiltonian is derived from the orbitally degenerate Hubbard model at quarter filling. This model is equivalent to the Bethe soluble SU(4) exchange model. Quantum numbers of the ground state and the lowest branch of excitations are determined. The spin-spin correlation functions are obtained numerically by the density matrix renormalization group method. It shows a power-law decay with oscillations of the period of four sites. The period originates from the interference between the spin and orbital degrees of freedom. The exponent of the power-law decay estimated from the finite size data is consistent with the prediction by the conformal field theory.

本文言語English
ページ(範囲)9114-9118
ページ数5
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
58
14
DOI
出版ステータスPublished - 1998
外部発表はい

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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