用非线性薛定谔方程讨论超晶格中畴的运动

THE FORMATION AND PROPAGATION OF DOMAINS IN SUPERLATTICES DISCUSSED WITH NONLINEAR SCHR¨ODINGER EQUATION

用非线性薛定谔方程讨论超晶格畴的形成和漂移，得到具有负微分电导特性的超晶格中畴的波函数是 Ｂｌｏｃｈ 函数的一个孤子型包络函数，它在外电场作用下做漂移运动．

The formation and propagation of domains in superlattices are discussed using a nonlinear Schrdinger equation.Negative differential conductivity in superlattices leads to the growth of inevitable spatial fluctuations,and a propagating electron accumulation\|layer domain is formed.It is shown that envelopes of the wave functions are governed by the nonlinear Schrdinger equation which has soliton solutions. PACC: 7220H; 7230; 0560; 0365