Suppression of thermal fluctuations of nanomechanical resonator (ground state cooling) by thermally activated electronic flow. Leonid Gorelik Department of Applied Physics Chalmers University of Technology Gothenburg, Sweden

We consider a doubly clamped suspended metallic carbon nanotube in which extra charge is injected from the tipof a scanning tunneling microscopy (STM). Our analysis shows that the quantum superposition between the different inelastic electronic tunneling paths can be controlled by the bias voltage. In particular, we find that below Coulomb blockade threshold the vibron emission induced by thermally activated electron transportation can be significantly reduced in comparison to the vibron absorption. As a consequence a net suppression of the thermal fluctuations (“cooling”) of the vibrational degrees of freedom can be achieved.