ESR-STM on single molecules and molecule-based buildings — ScienceDaily


Cutting down info units to the atomic scale has introduced the curiosity of utilizing particular person spins as a fundamental unit for knowledge storage. This requires exact detection and management of spin states and a greater understanding of spin-spin interactions.

For the primary time ever, scientists on the IBS Middle for Quantum Nanoscience at Ewha Womans College (QNS) have imaged the spin of a person molecule utilizing electron spin resonance in a scanning tunneling microscope. This achievement, revealed this month in Nature Chemistry, harnessed the facility of artificial chemistry to manage the electron spin of a molecule.

A scanning tunneling microscope (STM) has the flexibility to see actual atomic buildings, atom by atom, at a stage that’s not potential with different methods. This research makes use of an electrical microwave utilized to the STM tip to drive electron spin resonance (ESR) on single molecules and examine the magnetic interplay between two molecules utilizing this system.

“Using single molecules in atomic-scale quantum-control research is at all times of excessive curiosity and significance. This work sheds gentle on some intriguing magnetic interactions between non-localized spins, which is essential for growing molecule-based spintronic units,” says the paper’s first creator, Dr. Xue Zhang.

Fe, Ti atoms, and FePc molecules had been co-deposited on the floor of a skinny magnesium oxide movie grown on a silver substrate. They had been then imaged and probed utilizing an STM geared up with ESR capabilities. This work has prolonged the ESR experimental platform from single atoms to a wider class of matter — magnetic molecules, which brings many extra prospects to carry out quantum management on single magnetic molecules.

Electron spin resonance is extensively employed in biology and chemistry to find out the construction of unknown molecules and to measure the dynamic properties of spins in these molecules. ESR is a cousin of magnetic resonance imaging (MRI) that most individuals are acquainted with from hospital visits. ESR can also be a necessary device within the rising analysis discipline of quantum-coherent nanoscience, the place the quantum properties of spins are utilized for quantum computation and quantum info science.

“It’s spectacular to see that the intermolecular interplay could be investigated with an vitality decision within the nano-electron volt precision. Definitely, we must always discover extra unknowns with this incredible ESR-STM approach,” says Yu Wang of QNS.

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