Electron spin spectroscopy of single TEMPO dimers coupled via interfering tunneling currents

Yishay Manassen, Moamen Jbara, Michael Averbukh, Zion Hazan, Carsten Henkel, Baruch Horovitz

Research output: Working paper/PreprintPreprint

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Abstract

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 tunnelling microscope (ESR-STM method). The multi-peak power spectra, distinct from macroscopic data, are assigned to dimers having exchange and Dzyaloshinskii-Moriya interactions in 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.
Original languageEnglish
StatePublished - 1 Jan 2022

Keywords

  • Condensed Matter - Mesoscale and Nanoscale Physics
  • Physics - Chemical Physics

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