Department of Chemistry, Centre of Theoretical and Computational Physics, The University of Hong Kong, China.
Nanoscale. 2013 Jan 7;5(1):169-73. doi: 10.1039/c2nr32343e. Epub 2012 Nov 22.
The transient current through an array of as many as 1000 quantum dots is simulated with two newly developed quantum mechanical methods. To our surprise, upon switching on the bias voltage, the current increases linearly with time before reaching its steady state value. And the time required for the current to reach its steady state value is proportional to the length of the array, and more interestingly, is exactly the time for a conducting electron to travel through the array at the Fermi velocity. These quantum phenomena can be understood by a simple analysis on the energetics of an equivalent classical circuit. An experimental design is proposed to confirm the numerical findings.
使用两种新开发的量子力学方法对多达 1000 个量子点的阵列的瞬态电流进行了模拟。令我们惊讶的是，在施加偏置电压后，电流在达到稳定状态值之前会随时间线性增加。而电流达到稳定状态值所需的时间与阵列的长度成正比，更有趣的是，它恰好是费米速度下通过阵列的传导电子所需的时间。这些量子现象可以通过对等效经典电路的能量学的简单分析来理解。提出了一个实验设计来证实数值结果。
