Infrared Optical Absorption Spectra in Cuprate Two-Leg Spin-Ladder Systems with a Cyclic Four-Spin Interaction(Low Dimensional Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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On the basis of a resonating valence-bond description, we investigate the excitation spectrum caused by the Raman process in cuprate two-leg spin ladders with a cyclic four-spin interaction. Owing to a cyclic four-spin interaction, the S=0 three-triplet excitation energy is reduced and becomes smaller than the S=0 two-triplet excitation energy around the end of the Brillouin zone. Possible interpretations for the change in the lowest-lying mode are discussed. We show that such a change in the lowest-lying mode yields the shoulder structure at the lower edge in the phonon-assisted optical absorption spectrum.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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Suga Seiichiro
Department of Applied Physics, Osaka University
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Inaba Kensuke
Department Of Applied Physics Osaka University
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Suga Sei-ichiro
Department Of Applied Physics Osaka University
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Suga Seiichiro
Department Of Applied Physics Osaka University
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