Impact of small-angle scattering on ballistic transport in quantum dots.
Impact of small-angle scattering on ballistic transport in quantum dots.
复制标题
小角度散射对量子点弹道输运的影响。
DOI：
10.1103/physrevlett.108.196807
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
A. Micolich
中科院分区：
文献类型：
--
作者：
A. See;I. Pilgrim;B. Scannell;R. Montgomery;O. Klochan;A. Burke;M. Aagesen;P. Lindelof;I. Farrer;D. Ritchie;R. P. Taylor;A. Hamilton;A. Micolich
随着电子设备尺寸的缩小，无序对性能的影响越来越大。用来填充电子的电离掺杂剂尤其有问题，导致量子点等设备每次冷却使用时，其行为都会发生不可预测的变化。我们发现，量子点可以作为无序势变化的高灵敏探测器，通过去除电离掺杂和静电填充量子点，其电子性质在热循环到室温后变得高保真。我们的工作表明，无序势对电子动力学有重要的，甚至是主导的影响，对量子点中的“弹道”输运具有重要的意义。
Disorder increasingly affects performance as electronic devices are reduced in size. The ionized dopants used to populate a device with electrons are particularly problematic, leading to unpredictable changes in the behavior of devices such as quantum dots each time they are cooled for use. We show that a quantum dot can be used as a highly sensitive probe of changes in disorder potential and that, by removing the ionized dopants and populating the dot electrostatically, its electronic properties become reproducible with high fidelity after thermal cycling to room temperature. Our work demonstrates that the disorder potential has a significant, perhaps even dominant, influence on the electron dynamics, with important implications for "ballistic" transport in quantum dots.