Related Experiment Video
Updated: Jun 23, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Spin torque-driven electron paramagnetic resonance of a single spin in a pentacene molecule
Stepan Kovarik1, Richard Schlitz1, Aishwarya Vishwakarma1
1Department of Materials, ETH Zurich, CH-8093 Zürich, Switzerland.
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.
Related Concept Videos
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
Spin–Spin Coupling: One-Bond Coupling
NMR Spectroscopy: Spin–Spin Coupling
Atomic Nuclei: Nuclear Spin State Overview
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
The Pauli Exclusion Principle

