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arXiv · 1102.1828

Coherent properties of nano-electromechanical systems

G. Piovano·F. Cavaliere·E. Paladino·M. Sassetti
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Abstract

We study the properties of a nano-electromechanical system in the coherent regime, where the electronic and vibrational time scales are of the same order. Employing a master equation approach, we obtain the stationary reduced density matrix retaining the coherences between vibrational states. Depending on the system parameters, two regimes are identified, characterized by either ($i$) an {\em effective} thermal state with a temperature {\em lower} than that of the environment or ($ii$) strong coherent effects. A marked cooling of the vibrational degree of freedom is observed with a suppression of the vibron Fano factor down to sub-Poissonian values and a reduction of the position and momentum quadratures.

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G. Piovano, F. Cavaliere, E. Paladino, M. Sassetti. 2011-04-18. Coherent properties of nano-electromechanical systems. https://doi.org/10.1103/physrevb.83.245311

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