Control over quantum systems is typically achieved by time-dependent electric or magnetic fields. Alternatively, electronic spins can be controlled by spin-polarized currents. Here, we demonstrate coherent driving of a single spin by a radiofrequency spin-polarized current injected from the tip of a scanning tunneling microscope into an organic molecule. With the excitation of electron paramagnetic resonance, we established dynamic control of single spins by spin torque using a local electric current. In addition, our work highlights the dissipative action of the spin-transfer torque, in contrast to the nondissipative action of the magnetic field, which allows for the manipulation of individual spins based on controlled decoherence.

中文翻译：

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并五苯分子中单自旋的自旋力矩驱动的电子顺磁共振


对量子系统的控制通常是通过时间相关的电场或磁场来实现的。或者，电子自旋可以通过自旋极化电流来控制。在这里，我们展示了从扫描隧道显微镜尖端注入有机分子的射频自旋极化电流对单自旋的相干驱动。通过电子顺磁共振的激发，我们利用局部电流建立了通过自旋扭矩对单自旋的动态控制。此外，我们的工作强调了自旋转移力矩的耗散作用，与磁场的非耗散作用相反，磁场的非耗散作用允许基于受控退相干来操纵单个自旋。