EurekAlert  July 2, 2024 Control over quantum systems is typically achieved by time-dependent electric or magnetic fields. Alternatively, electronic spins can be controlled by spin-polarized currents. Researchers in Switzerland demonstrated 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, they established dynamic control of single spins by spin torque using a local electric current. Their work highlighted the dissipative action of the spin-transfer torque, in contrast to the nondissipative action of the magnetic field, which allowed for the […]