Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-05-09
New J. Phys. 13 (2011) 103017
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Published version
Scientific paper
We investigate theoretically the electromechanical properties of freely suspended nanowires that are in tunnelling contact with the tip of a scanning tunnelling microscope (STM) and two supporting metallic leads. The aim of our analysis is to characterize the fluctuations of the dynamical variables of the nanowire when a temperature drop is mantained between the STM tip and the leads, which are all assumed to be electrically grounded. By solving a quantum master equation that describes the coupled dynamics of electronic and mechanical degrees of freedom we find that the stationary state of the mechanical oscillator has a Gaussian character, but that the amplitude of its root-mean square center-of-mass fluctuations is smaller than would be expected if the system were coupled only to the leads at thermal equilibrium.
Gorelik Leonid Y.
Jonson Mats
Santandrea Fabio
Shekhter Robert I.
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