Collective Modes of Incommensurate Spin-Density Wave : Condensed Matter and Statistical Physics
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We investigate collective modes of the incommensurate spin-density wave state for a one-dimensional two-band model within the random phase approximation. For this model, compact expressions of the two-particle Green functions can be obtained. Three types of collective modes are found; an amplitude mode, a phase mode in a real space (a sliding mode) and a phase mode in a spin space (a spin wave mode). The amplitude mode appears in the longitudinal susceptibility and the spin wave mode appears in the transverse susceptibility, but the sliding mode is found to have no contribution to the susceptibilities. The amplitude mode has the same energy with the energy gap of single particle excitations, but if it is coupled with phonons, its frequency is lowered and it makes a mid-gap mode.
- 理論物理学刊行会の論文
- 1984-11-25
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