多体系统中的准粒子束缚态

摘要

Two interacting quaslparticles in condense matter may from a boundstate,whether their interaction is small.A universal condition of a boundstate is obtained by Green function,Method Phonoriton-a new quasiparticle was put froward by Birmen in 1990,and yet none have deen seen in eperiments.Thereof a detailed discussion is given.