engleski

Spin-polaronic effects in electric shuttling in a single molecule transistor with magnetic leads

Current–voltage characteristics of a spintromechanical device, in which spin-polarized electrons tunnel between magnetic leads with anti-parallel magnetization through a single-level movable quantum dot, are calculated. New exchange- and electromechanical coupling-induced (spin-polaronic) effects that determine strongly nonlinear current–voltage characteristics were found. In the low-voltage regime of electron transport the voltage-dependent and exchange field-induced displacement of the quantum dot towards the source electrode leads to a nonmonotonic behavior of the differential conductance, which demonstrates the lifting of spin-polaronic effects by an electric field. At high voltages the onset of electron shuttling results in a drop of the current and a negative differential conductance, caused by a mechanically induced increase of the tunnel resistances and an exchange field-induced suppression of spin-flips caused by an external magnetic field. The dependence of these predicted spin effects on the oscillation frequency of the dot and the strength of electron–electron correlations is discussed.

NEMS, shuttle

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