ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Castelldefels, Barcelona , Spain.
Centre de Nanosciences et de Nanotechnologies, CNRS , University of Paris-Sud, University of Paris-Saclay, C2N Marcoussis, 91460 Marcoussis , France.
Nano Lett. 2018 Aug 8;18(8):5324-5328. doi: 10.1021/acs.nanolett.8b02437. Epub 2018 Jul 31.
Mechanical resonators based on a single carbon nanotube are exceptional sensors of mass and force. The force sensitivity in these ultralight resonators is often limited by the noise in the detection of the vibrations. Here, we report on an ultrasensitive scheme based on a RLC resonator and a low-temperature amplifier to detect nanotube vibrations. We also show a new fabrication process of electromechanical nanotube resonators to reduce the separation between the suspended nanotube and the gate electrode down to ∼150 nm. These advances in detection and fabrication allow us to reach [Formula: see text] displacement sensitivity. Thermal vibrations cooled cryogenically at 300 mK are detected with a signal-to-noise ratio as high as 17 dB. We demonstrate [Formula: see text] force sensitivity, which is the best force sensitivity achieved thus far with a mechanical resonator. Our work is an important step toward imaging individual nuclear spins and studying the coupling between mechanical vibrations and electrons in different quantum electron transport regimes.
基于单根碳纳米管的机械谐振器是质量和力的出色传感器。在这些超轻谐振器中，力灵敏度通常受到振动检测噪声的限制。在这里，我们报告了一种基于 RLC 谐振器和低温放大器的超灵敏方案，用于检测纳米管振动。我们还展示了一种新的机电纳米管谐振器制造工艺，将悬浮纳米管和栅极电极之间的分离减小到约 150nm。这些在检测和制造方面的进步使我们能够达到[公式：见正文]的位移灵敏度。在 300mK 低温下冷却的热振动的检测信噪比高达 17dB。我们证明了[公式：见正文]的力灵敏度，这是迄今为止使用机械谐振器实现的最佳力灵敏度。我们的工作朝着对单个核自旋成像和研究机械振动与不同量子电子输运模式下电子之间的耦合迈出了重要一步。
