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[交流] 并五苯分子中单个自旋的自旋力矩驱动的电子顺磁共振

并五苯分子中单个自旋的自旋力矩驱动的电子顺磁共振

▲ 作者:STEPAN KOVARIK, RICHARD SCHLITZ, AISHWARYA VISHWAKARMA, DOMINIC RUCKERT, PIETRO GAMBARDELLA AND SEBASTIAN STEPANOW

▲ 链接:

https://www.science.org/doi/10.1126/science.adh4753

▲ 摘要:

对量子系统的调控通常由与时间相关的电场或磁场来实现。另外,电子自旋可通过自旋极化电流来控制。

研究组演示了从扫描隧道显微镜尖端注入射频自旋极化电流至有机分子中的单个自旋相干驱动。在电子顺磁共振激发下,利用局域电流通过自旋力矩建立了单个自旋的动态控制。

此外,该工作强调了自旋转移力矩的耗散作用,这与基于受控退相干操纵单个自旋的磁场非耗散作用迥然不同。

▲ Abstract:

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.
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