Khivrich Ilya, Clerk Aashish A, Ilani Shahal
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.
Institute for Molecular Engineering, University of Chicago, Chicago, IL, USA.
Nat Nanotechnol. 2019 Feb;14(2):161-167. doi: 10.1038/s41565-018-0341-6. Epub 2019 Jan 14.
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.
输运测量一直是研究物质导电状态不可或缺的工具。然而，存在大量有趣的绝缘态，这些绝缘态通常源于电子相互作用或拓扑结构，难以通过输运来探测。在此，通过对碳纳米管进行的一项实验，我们提出了一种新方法，该方法能够通过绝缘电子态对纳米机械运动的反作用来测量这些绝缘电子态。我们采用一种机械泵浦 - 探测方案，在一个整体绝缘系统中，实现对机械振动模式的频率和耗散率变化的检测。例如，我们用这种方法探测双量子点的非导电构型，从而能够观察到由相干隧穿电子产生的纳米机械反作用的理论预测特征。该技术为测量一维和二维系统中越来越多绝缘态的内部电子结构开辟了一条新途径。
