Suppression of the stochastic fluctuations of suspended nanowires by temperature-induced single-electron tunneling

F. Santandrea, L. Y. Gorelik, R. I. Shekhter, M. Jonson

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We theoretically investigate the electromechanical properties of freely suspended nanowires that are in tunneling contact with the tip of a scanning tunneling 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 maintained 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 found 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.

Original languageEnglish
Article number103017
Number of pages12
JournalNew Journal of Physics
Publication statusPublished - 14 Oct 2011

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