Atomic-scale imperfections and fluctuations in the transmission properties of a quantum dot.
Atomic-scale imperfections and fluctuations in the transmission properties of a quantum dot.
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DOI：
10.1103/physrevb.50.10990
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发表时间：
1994-10
期刊：
影响因子：
--
通讯作者：
Kirby;Ting;McGill
中科院分区：
文献类型：
--
作者：
Kirby;Ting;McGill
我们研究了原子尺度缺陷对量子点共振隧穿结构传输特性的影响。为此，我们采用了量子输运的三维模型。我们发现，量子点表面粗糙度的变化导致了传输特性的大幅波动。研究了量子点中的杂质作为杂质强度和位置的函数，发现在量子点中心附近的吸引杂质可以减少由表面粗糙度引起的起伏。然而，不止一个杂质的存在会引起复杂的共振结构，该结构随杂质构型而变化很大。
We examine the effects of atomic-scale imperfections on the transmission properties of a quantum dot resonant tunneling structure. For this purpose, we employ a three-dimensional model of quantum transport. We find that variation in the surface roughness of quantum dots leads to substantial fluctuations in the transmission properties. Impurities in a quantum dot are studied as a function of impurity strength and location, and it is found that an attractive impurity near the center of a dot can reduce fluctuations caused by surface roughness. Nevertheless, the presence of more than a single impurity can give rise to a complex resonance structure that varies substantially with impurity configuration.