量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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The magnetization process of the S = 1 antiferromagnetic chain with the
biquadratic interaction is investigated using the numerical
diagonalization. As a result, it is found that the quantum spin nematic
liquid phase appears below the saturation magnetization for sufficiently
large negative biquadratic interaction. The ground state phase diagram
is also presented. This result is consistent with the previous density
matrix renormalization group study. In addition the present study
confirms that the two magnon excitation is gapless, while the single
magnon one is gapped in the spin nematic liquid phase.
Quantum spin nematic liquid in the S=1 antiferromagnetic chain with the biquadratic interaction
