title: Radio frequency scanning tunneling spectroscopy for single-molecule spin resonance.
abstract: We probe nuclear and electron spins in a single molecule even beyond the electromagnetic dipole selection rules, at readily accessible magnetic fields (few mT) and temperatures (5 K) by resonant radio-frequency current from a scanning tunneling microscope. We achieve subnanometer spatial resolution combined with single-spin sensitivity, representing a 10 orders of magnitude improvement compared to existing magnetic resonance techniques. We demonstrate the successful resonant spectroscopy of the complete manifold of nuclear and electronic magnetic transitions of up to ΔI(z)=±3 and ΔJ(z)=±12 of single quantum spins in a single molecule. Our method of resonant radio-frequency scanning tunneling spectroscopy offers, atom-by-atom, unprecedented analytical power and spin control with an impact on diverse fields of nanoscience and nanotechnology.
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Müllegger
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Stefano
authors.initials: S
authors.lastname: Tebi
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Amal K
authors.initials: AK
authors.lastname: Das
authors.affiliation: Institute of Organic Chemistry, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schöfberger
authors.affiliation: Institute of Organic Chemistry, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Felix
authors.initials: F
authors.lastname: Faschinger
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, 4040 Linz, Austria.
authors.forename: Reinhold
authors.initials: R
authors.lastname: Koch
mesh_terms: D055590:Electromagnetic Phenomena; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011846:Radio Waves