Electronic conductance of one-dimensional chains with phonon dephasing disorder
Electronic conductance of one-dimensional chains with phonon dephasing disorder
复制标题
具有声子相移无序的一维链的电子电导
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
G. Pastori Parravicini
中科院分区：
文献类型：
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作者：
A. Cresti;G. Grosso;G. Pastori Parravicini
在本文中，我们分析了如何通过链的有限链中活跃的声子相移机制来改变通过一维链的电子传输。该处理基于非平衡凯尔迪什·格林函数和自洽的第一玻恩近似，以及电子态的紧密约束描述。计算的电导曲线的一个最显着的特征是小长度出现指数下降，然后是与链长度成反比的缓慢渐近下降。这种不同的短程和长程电导行为的起源以及其他观察到的缩放特征可以通过对移相机制的一些直观理解来解释。
In this paper we analyse how electron transport through a one-dimensional chain is modified by the presence of phonon dephasing mechanisms active in a limited strand of the chain. The treatment is based on the nonequilibrium Keldysh Green’s function and the self-consistent first Born approximation, with a tight-binding description of the electronic states. A most remarkable feature of the calculated conductance curves is the occurrence of an exponential decrease for small lengths, followed by a slow asymptotic decrease inversely proportional to the strand length. The origin of such a different short-range and long-range behaviour of the conductance, and other observed scaling features, are interpreted with some intuitive understanding of the dephasing mechanisms.