Ensemble Control of Kondo Screening in Molecular Adsorbates

Bret Maughan, Percy Zahl, Peter Sutter, Oliver L A Monti Masel

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Switching the magnetic properties of organic semiconductors on a metal surface has thus far largely been limited to molecule-by-molecule tip-induced transformations in scanned probe experiments. Here we demonstrate with molecular resolution that collective control of activated Kondo screening can be achieved in thin-films of the organic semiconductor titanyl phthalocyanine on Cu(110) to obtain tunable concentrations of Kondo impurities. Using low-temperature scanning tunneling microscopy and spectroscopy, we show that a thermally activated molecular distortion dramatically shifts surface-molecule coupling and enables ensemble-level control of Kondo screening in the interfacial spin system. This is accompanied by the formation of a temperature-dependent Abrikosov-Suhl-Kondo resonance in the local density of states of the activated molecules. This enables coverage-dependent control over activation to the Kondo screening state. Our study thus advances the versatility of molecular switching for Kondo physics and opens new avenues for scalable bottom-up tailoring of the electronic structure and magnetic texture of organic semiconductor interfaces at the nanoscale.

Original languageEnglish (US)
Pages (from-to)1837-1844
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume8
Issue number8
DOIs
StatePublished - Apr 20 2017

ASJC Scopus subject areas

  • Materials Science(all)

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