Absorption-site specific Kondo resonance observed in single molecule magnet TbPc<sub>2</sub> on Ag(111)
ORAL
Abstract
The single molecule magnet bis(phthalocyaninato)terbium(III) (TbPc2) has attracted steady research attention as an exemplar system for realizing molecule based spin electronics. Lattices of these molecules interact through the π-electrons in their Pc ligands, which manifests itself experimentally as a Kondo resonance in spectroscopy measurements. Understanding these interactions is crucial for their subsequent use in quantum computing schema. We studied TbPc2 molecules evaporated in ultrahigh vacuum onto a single crystal Ag(111) surface, measured at 5K using combined scanning tunneling and non-contact atomic force microscopies (STM/ nc-AFM). Submolecular resolution achieved with a CO- functionalized tip offers unprecedented structural information, specifically regarding the two sub-lattices forming tight-packed TbPc2 islands. Kondo resonances are observed on molecules absorbed as a second layer on the larger TbPc2 islands: the presence or absence of the Kondo signature is exactly correlated with the sub-lattice absorption site. Spectroscopies taken with a CO- terminated tip showed the Kondo resonance shifted to the center of the ligand. The latest efforts to understand the structural origin of this site-specific Kondo resonance will be reported.
–
Presenters
-
John Hellerstedt
- Department of Physics and Astronomy and Centre for Future Low Energy Electronics Technologies, Monash University
- School of Physics and Astronomy, Monash University
- Czech Academy of Sciences Institute of Physics