Spin Excitation Assisted by Non-Softening Phonon for Spin-Peierls Model
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概要
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We study spin dynamics of a spin-Peierls chain with nearest-neighbor and next-nearest-neighbor Heisenberg spin exchange interactions together with a gapped and dispersionless phonon. The dynamical spin correlation function and phonon excitation spectrum are calculated at zero temperature by using dynamical density-matrix renormalization-group method. We find a new spin excitation assisted by non-softening phonon. The excitation is located above phonon in energy and shows a dispersive feature with strong intensity near the momentum \pi. The phonon excitation spectrum is also influenced by the spin--phonon interaction. We discuss the possibility of observing the spin--phonon coupled features in inorganic spin-Peierls compound CuGeO3.
- 2012-03-15
著者
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Tohyama Takami
Yukawa Inst. For Theoretical Physics Kyoto Univ.
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Tohyama Takami
Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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SUGIMOTO Takanori
Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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SOTA Shigetoshi
Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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