中国物理B ›› 2008, Vol. 17 ›› Issue (11): 4268-4272.doi: 10.1088/1674-1056/17/11/051
胡新广, 唐 翌
Hu Xin-Guang (胡新广), Tang Yi (唐 翌)
摘要: This paper studies the two-vibron bound states in the $\beta $--Fermi--Pasta--Ulam model by means of the number conserving approximation combined with the number state method. The results indicate that on-site, adjacent-site and mixed two-vibron bound states may exist in the model. Specially, wave number has a significant effect on such bound states, which may be considered as the quantum effects of the localized states in quantum systems.
中图分类号: (Phonon states and bands, normal modes, and phonon dispersion)