摘要
理论研究了势垒对量子线中电子弹道输运性质的影响 .我们采用了转移矩阵方法和截断近似技术 .计算结果表明 ,当不存在势垒时 ,量子线的电导呈现出台阶的性质 .电导的每一台阶对应于一横向能级被占据 .当量子线的一边存在势垒时 ,电导的台阶特征仍能保持 .但当量子线的两边都存在势垒时 ,电导的台阶特征被破坏了 .
The influence of potential barrier on the ballistic transport properties of electrons in quantum wires is studied.The transfer matrix method and the truncation technique are employed.The numerical results indicate that the conductance of quantum wires without potential barrier inside shows plateau-typed.Each plateau corresponds to one transverse energy level occupied.When a potential barrier exists in one side of quantum wire,the shape of conductance plateaus can still be holden.However,when potential barriers appear in two sides of the quantum wire,the conductance plateaus are destroyed.
出处
《山东师范大学学报（自然科学版）》
CAS
2001年第3期268-271,共4页
Journal of Shandong Normal University(Natural Science)
关键词
电导
转移矩阵方法
弹道输运
量子线
conductance
transfer matrix method
ballistic transport
quantum wire
