Nanomechanical pump-probe measurements of insulating electronic states in a carbon nanotube
Nanomechanical pump-probe measurements of insulating electronic states in a carbon nanotube
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DOI：
10.1038/s41565-018-0341-6
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发表时间：
2019-02-01
影响因子：
38.3
通讯作者：
Ilani, Shahal
中科院分区：
文献类型：
--
作者：
Khivrich, Ilya;Clerk, Aashish A.;Ilani, Shahal
输运测量一直是研究物质导电态的一个不可或缺的工具。然而，存在大量有趣的绝缘状态，通常是由于电子相互作用或拓扑结构，并且难以通过传输探测。通过对碳纳米管的实验，我们提出了一种新的方法，可以通过碳纳米管对纳米机械运动的反向作用来测量绝缘电子态。我们使用机械泵-探针方案，允许在整个绝缘系统中检测机械振动模式的频率和耗散率的变化。作为一个例子，我们使用这种方法来探测双量子点的非导电构型，使我们能够观察到理论预测的由相干隧穿电子引起的纳米力学反作用的特征。该技术为测量一维和二维系统中越来越多的绝缘状态的内部电子结构开辟了一条新途径。
Transport measurements have been an indispensable tool in studying conducting states of matter. However, there exists a large set of interesting states that are insulating, often due to electronic interactions or topology, and are difficult to probe via transport. Here, through an experiment on carbon nanotubes, we present a new approach capable of measuring insulating electronic states through their back action on nanomechanical motion. We use a mechanical pump-probe scheme, allowing the detection of shifts in both frequency and dissipation rate of mechanical vibrational modes, in an overall insulating system. As an example, we use this method to probe the non-conducting configurations of a double quantum dot, allowing us to observe the theoretically predicted signature of nanomechanical back action resulting from a coherently tunnelling electron. The technique opens a new way for measuring the internal electronic structure of a growing variety of insulating states in one-and two-dimensional systems.