(Charla) Quantum-dot based nanomotors with strong Coulomb interactions

HERNAN L. CALVO

Trieste

Conferencia; Quantum Dynamics of Disordered Interacting Systems; 2018

ICTP

In recent years there has been increasing excitement regarding nanoelectromechanical systems (NEMS) and particularly current-drivennanomotors. Despite the broad variety of stimulating results found, theregime of strong Coulomb interactions has not been fully explored for thisapplication. In this talk, we consider NEMS composed of a set of coupledquantum dots interacting with mechanical degrees of freedom taken in the adiabatic limit and weakly coupled to electronic reservoirs. A real-time diagrammatic approach is used to derive general expressions for the current-induced forces, friction coefficients, and zero-frequency forcenoise in the Coulomb blockade regime of transport. We show our expressions obey Onsager?s reciprocity relations and the fluctuation-dissipation theorem for the energy dissipation of the mechanical modes. The obtained results are illustrated with a nanomotor consisting of adouble quantum dot capacitively coupled to rotating charges. We analyzethe dynamics and performance of the motor as a function of the appliedvoltage and loading force for trajectories encircling different triple points in the charge stability diagram.