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The bistability transition induced by a strong nano-electromechanical coupling

Martes, Noviembre 14, 2017 - 12:00
Place: 
Donostia International Physics Center
Who: 
Fabio Pistolesi (Directeur, Laboratoire Ondes et Matière d'Aquitaine, Univ. Bordeaux & CNRS)
Source Name: 
DIPC

I will discuss the mechanical bistability transition induced in a nano
electromechanical oscillator coupled capacitively to a quantum dot. We
have recently shown that at the transition the mechanical mode becomes
soft, and the mechanical response presents several peculiarities. The
most striking one is an important broadening of the resonance with a
universal quality factor at the transition. These results have been
obtained in the limit of slow classical oscillator with respect to the
tunneling rate of electrons. In this talk I will discuss also the
opposite case, of fast quantum mechanical mode in the tunneling limit,
and show that the displacement correlation function presents also
remarkable features.



References for the published part of the presentation:



G. Micchi, R. Avriller, F.P., Phys. Rev. B, (2016).

G. Micchi, R. Avriller, F.P., Phys. Rev. Lett. (2015).



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