The analysis of renormalization group shows that only one is instability which is in critical state of phase tran si ton and will change with a little perturbation.

• 采用重正化群的分析方法分析发现,其中有一种是不稳定的,处于相变临界状态,稍有微小干扰,即可发生状态的变化,其变化的方向取决于微扰的初始条件。