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arXiv 0911.4017cond-mat.mes-hall
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Kronig-Penney势中的Dirac电子:色散关系和势垒强度的透射周期

Dirac electrons in a Kronig-Penney potential: dispersion relation and transmission periodic in the strength of the barriers

M. Barbier, P. Vasilopoulos, F. M. Peeters

摘要:

本文研究了具有线性能谱的二维费米子通过一个或多个一维δ函数势垒的透射T和电导G。T和G是δ函数势垒V(x,y)/ hbar v_F = P δ(x)的强度P的周期函数。超晶格的Kronig-Penney(KP)模型的色散关系也是P的周期函数,并且对于P = 2 π n和n整数,引起入射电子束的准直。对于一个KP超晶格,势垒的高度符号交替,当P =(n + 1/2)π时,狄拉克点变成狄拉克线。

英文摘要:

The transmission T and conductance G through one or multiple one-dimensional, delta-function barriers of two-dimensional fermions with a linear energy spectrum are studied. T and G are periodic functions of the strength P of the delta-function barrier V(x,y) / hbar v_F = P delta(x). The dispersion relation of a Kronig-Penney (KP) model of a superlattice is also a periodic function of P and causes collimation of an incident electron beam for P = 2 pi n and n integer. For a KP superlattice with alternating sign of the height of the barriers the Dirac point becomes a Dirac line for P = (n + 1/2) pi.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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