Model for electron spin resonance in STM noise

Alvaro Caso, Baruch Horovitz, Liliana Arrachea

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We propose a model to account for the observed ESR-like signal at the Larmor frequency in the current noise scanning tunnel microscope (STM) experiments identifying spin centers on various substrates. The theoretical understanding of this phenomenon, which allows for single spin detection on surfaces at room temperature, is not settled for the experimentally relevant case that the tip and substrate are not spin polarized. Our model is based on a direct tip-substrate tunneling in parallel with a current flowing via the spin states. We find a sharp signal at the Larmor frequency even at high temperatures, in good agreement with experimental data. We also evaluate the noise in presence of an ac field near resonance and predict splitting of the signal into a Mollow triplet.

Original languageEnglish
Article number075412
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number7
DOIs
StatePublished - 12 Feb 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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