Fiche publication
Date publication
janvier 2025
Journal
ACS nano
Auteurs
Membres identifiés du Cancéropôle Est :
Dr CHERIOUX Frédéric
Tous les auteurs :
Pawlak R, Anindya KN, Chahib O, Liu JC, Hiret P, Marot L, Luzet V, Palmino F, Chérioux F, Rochefort A, Meyer E
Lien Pubmed
Résumé
Flat bands in Kagome graphene might host strong electron correlations and frustrated magnetism upon electronic doping. However, the porous nature of Kagome graphene opens a semiconducting gap due to quantum confinement, preventing its fine-tuning by electrostatic gates. Here we induce zero-energy states into a semiconducting Kagome graphene by inserting π-radicals at selected locations. We utilize the on-surface reaction of tribromotrioxoazatriangulene molecules to synthesize carbonyl-functionalized Kagome graphene on Au(111), thereafter modified by exposure to atomic hydrogen. Atomic force microscopy and tunneling spectroscopy unveil the stepwise chemical transformation of the carbonyl groups into radicals, which creates local magnetic defects of spin state = 1/2 and zero-energy states as confirmed by density functional theory. The ability to imprint local magnetic moments opens up prospects to study the interplay between topology, magnetism, and electron correlation in Kagome graphene.
Mots clés
Kagome graphene, atomic force microscopy, density functional theory, on-surface synthesis, radical spins, scanning tunneling microscopy
Référence
ACS Nano. 2025 01 10;:
