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Tuning Single-Atom Electron Spin Resonance in a Vector Magnetic Field

Willke, Philip; Singha, Aparajita; Zhang, Xue; Esat, Taner; Lutz, Christopher P.; Heinrich, Andreas J.; Choi, Taeyoung

Spin resonance of single spin centers bears great potential for chemical structure analysis, quantum sensing and quantum coherent manipulation. Essential for these experiments is the presence of a two-level spin system whose energy splitting can be chosen by applying a magnetic field. In recent years, a combination of electron spin resonance (ESR) and scanning tunneling microscopy (STM) has been demonstrated as a technique to detect magnetic properties of single atoms on surfaces and to achieve sub-μeV energy resolution. Nevertheless, up to now the role of the required magnetic fields has not been elucidated. Here, we perform single-atom ESR on individual Fe atoms adsorbed on magnesium oxide (MgO), using a 2D vector magnetic field as well as the local field of the magnetic STM tip in a commercially available STM. We show how the ESR amplitude can be greatly improved by optimizing the magnetic fields, revealing in particular an enhanced signal at large in- 2 plane magnetic fields. Moreover, we demonstrate that the stray field from the magnetic STM tip is a versatile tool. We use it here to drive the electron spin more efficiently and to perform ESR measurements at constant frequency by employing tip-field sweeps. ... mehr

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Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 11.2019
Sprache Englisch
Identifikator KITopen-ID: 1000119949
Umfang 16 S.
Vorab online veröffentlicht am 29.10.2019
Schlagwörter Scanning Tunneling Microscopy, Electron Spin Resonance, Vector magnetic field
Nachgewiesen in arXiv
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