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 quantum dot towards the source electrode leads to nonmonotonic behavior of differential conductance that demonstrates the lifting of spin-polaronic effects by electric field. At high voltages the onset of electron shuttling results in the drop of current and negative differential conductance, caused by mechanically-induced increase of tunnel resistivities and exchange field-induced suppression of spin-flips in magnetic field. The dependence of these predicted spin effects on the oscillations frequency of the dot and the strength of electron–electron correlations is discussed.

计算了自旋机械装置的电流-电压特性，其中自旋极化的电子在磁导线之间穿过单级可移动量子点以反平行磁化方式隧穿。发现了新的由交换和机电耦合引起的（自旋极化）效应，这些效应决定了强非线性电流-电压特性。在电子传输的低电压状态下，电压依赖性和交换场引起的量子点向着源电极的位移导致电导差的非单调行为，这证明了电场对自旋极化作用的提升。在高电压下，电子穿梭的开始会导致电流下降和负电导差，由机械感应的隧道电阻率增加和交换场感应的磁场自旋翻转的抑制引起。讨论了这些预测的自旋效应对点振荡频率和电子-电子相关强度的依赖性。