Parallel carbon nanotube quantum dots and their interactions
Parallel carbon nanotube quantum dots and their interactions
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平行碳纳米管量子点及其相互作用
DOI：
10.1103/physrevb.87.035424
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发表时间：
2012
影响因子：
3.7
通讯作者：
C. Meyer
中科院分区：
文献类型：
--
作者：
K. Goss;M. Leijnse;Sebastian Smerat;M. Wegewijs;C. Schneider;C. Meyer
我们介绍了在碳纳米管绳索中形成的相互作用的平行量子点的量子输运测量。在这个分子量子点系统中，输运由一个量子点主导，而平行边点的附加共振出现，表现出弱的栅极耦合。这种差动门控效应提供了只有一个门电极的量子点系统的可调性，并提供了对携带电流的碳纳米管链的控制。通过将系统调谐到不同的状态，我们使用量子输运作为光谱工具来研究点间耦合，并展示了区分不同边点的路线。通过比较实验数据和主方程计算，我们确定了观察输运光谱中点间耦合的不同表现所需的隧穿速率的条件。
We present quantum transport measurements of interacting parallel quantum dots formed in the strands of a carbon nanotube rope. In this molecular quantum dot system, transport is dominated by one quantum dot, while additional resonances from parallel side dots appear, which exhibit a weak gate coupling. This differential gating effect provides a tunability of the quantum dot system with only one gate electrode and provides control over the carbon nanotube strand that carries the current. By tuning the system to different states we use quantum transport as a spectroscopic tool to investigate the inter-dot coupling and show a route to distinguish between various side dots. By comparing the experimental data with master equation calculations, we identify conditions for the tunneling rates that are required in order to observe different manifestations of the inter-dot coupling in the transport spectra.