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Y. Manassen, M. Jbara, M. Averbukh, Z. Hazan, C. Henkel, and B. Horovitz
Tunnel current noise spectra of spins in individual dimers of molecular radicals
Phys. Rev. B 106 (2022) 235438


    We report the detection of electron spin resonance (ESR) in individual dimers of the stable free radical 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO). ESR is measured by the current fluctuations in a scanning tunneling microscope (ESR-STM method). The multipeak power spectra, distinct from macroscopic data, are assigned to dimers having exchange and Dzyaloshinskii-Moriya interactions in the presence of spin-orbit coupling. These interactions are generated in our model by interfering electronic tunneling pathways from tip to sample via the dimer's two molecules. This is the first demonstration that tunneling via two spins is a valid mechanism of the ESR-STM method.

[ arxiv:2201.12154 ] [ DOI ]

file generated: 6 Jul 2022

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