The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, I-34151 Trieste, Italy.
Phys Rev Lett. 2013 Feb 8;110(6):066804. doi: 10.1103/PhysRevLett.110.066804. Epub 2013 Feb 5.
We consider the electromechanical properties of a single-electronic device consisting of a movable quantum dot attached to a vibrating cantilever, forming a tunnel contact with a nonmovable source electrode. We show that the resonance Kondo tunneling of electrons amplifies exponentially the strength of nanoelectromechanical (NEM) coupling in such a device and make the latter insensitive to mesoscopic fluctuations of electronic levels in a nanodot. It is also shown that the study of a Kondo-NEM phenomenon provides additional (as compared with standard conductance measurements in a nonmechanical device) information on retardation effects in the formation of a many-particle cloud accompanying the Kondo tunneling. A possibility for superhigh tunability of mechanical dissipation as well as supersensitive detection of mechanical displacement is demonstrated.
我们研究了由一个可移动量子点连接到一个振动的悬臂梁组成的单电子器件的机电特性，该量子点与一个不可移动的源电极形成了隧道接触。我们表明，电子的共振库仑隧道效应使这种器件中的纳米机电（NEM）耦合强度呈指数放大，并使后者对纳米点中电子能级的介观涨落不敏感。我们还表明，研究库仑-纳米机电现象提供了关于伴随库仑隧道形成的多粒子云形成的延迟效应的附加信息（与非机械器件中的标准电导测量相比）。我们展示了机械耗散的超高可调性以及对机械位移的超灵敏检测的可能性。
