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O: Fachverband Oberflächenphysik

O 44: Mini-Symposium: Manipulation and control of spins on functional surfaces II

O 44.3: Invited Talk

Tuesday, March 2, 2021, 14:15–14:45, R2

Quantum sensing and operation of single molecules on the surface — •Xue Zhang — Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — Ewha Womans University, Seoul 03760, Republic of Korea

Scaling down information devices to atom-scale has brought the interest of using individual spins as basic unit for data storage. Scanning tunneling microscopy (STM) combined with fast electric pulse and electron spin resonance (ESR) technique has been proved a powerful tool to access and coherently control individual spins in atomic scale.

Here, we investigated the spin properties and dynamics of artificially built Fe-tetracyanoethylene (TCNE) complexes by using electronic spin pump-probe spectroscopy. Further, we spatially imaged the location of the spin center within the complex [J. Phys. Chem. Lett., 2020, 11, 14, 5618]. This work highlights that the combination of STM with electronic spin relaxometry can provide highly valuable clues for investigating magnetic metal-organic nanostructures. While current ESR-STM studies have focused on atom spins, we achieved driving ESR on single molecules (metal phthalocyanine) on a bilayer magnesium oxide (MgO) surface atop Ag(100) [under review]. We probed and differentiated the exchange and dipole interaction between molecular dimers. This work demonstrates the feasibility of employing single molecules in atom-scale quantum control studies and shed light on intriguing magnetic interactions between molecular spins, which is crucial for developing molecule-based spintronic devices.