Two Types of Self-Trapped States for Excitons in One Dimension
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概要
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When excitons (or electrons) have only one-dimensional freedom of motion on a discrete lattice, free states are always unstable, irrespective of the strength of the exciton-phonon (short-ranged) interaction. Excitons spontaneously relax into self-trapped (S) states, distorting the lattice. Two types of S states are realized : One is a large-radius type associated with a spatially extended lattice distortion, while another is a small-radius type associated with a spatially contracted distortion. As the interaction strength increases, the lowest S state changes its character abruptly, although continuously, from the former to the latter. This result is rigorous within the adiabatic approximation, calculated with a method presented previously by the present authors [H. Sumi and S. Higai, J. Phys. Soc. Jpn. 62 (1993) 1500].
- 社団法人日本物理学会の論文
- 1994-12-15
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