Ensemble Control of Kondo Screening in Molecular Adsorbates

Area of Science:

• Materials Science
• Condensed Matter Physics
• Surface Science

Background:

• Switching magnetic properties of organic semiconductors on metal surfaces typically requires molecule-by-molecule manipulation.
• Existing methods are limited in scalability and collective control.

Purpose of the Study:

• To demonstrate collective control of activated Kondo screening in organic semiconductor thin-films.
• To achieve tunable concentrations of Kondo impurities through ensemble-level manipulation.
• To explore scalable bottom-up tailoring of electronic structure and magnetic texture.

Main Methods:

• Low-temperature scanning tunneling microscopy and spectroscopy.
• Utilizing thin-films of titanyl phthalocyanine on Cu(110).
• Inducing thermally activated molecular distortion.

Main Results:

• Demonstrated collective control of Kondo screening in titanyl phthalocyanine thin-films.
• Observed a thermally activated molecular distortion that alters surface-molecule coupling.
• Formation of a temperature-dependent Abrikosov-Suhl-Kondo resonance.
• Achieved coverage-dependent control over activation to the Kondo screening state.

Conclusions:

• Collective control of Kondo screening is achievable in organic semiconductor thin-films.
• Thermally activated molecular distortion enables ensemble-level manipulation of interfacial spin systems.
• This approach offers new avenues for scalable nanoscale engineering of electronic and magnetic properties.