CONGRESOS, CURSOS Y CONFERENCIAS
Seminario de Benjamin Lowe, del Instituto de Física de la Academia Checa de Ciencias (Praga): «Strong correlations in organic nanomaterials»
Sala de Conferencias, Edificio I+D+i, Campus Río Ebro
Seminario del INMA: Benjamin Lowe, del Instituto de Física de la Academia Checa de Ciencias (Praga)
Benjamin Lowe, del Instituto de Física de la Academia Checa de Ciencias (Praga, Chequia): «Strong correlations in organic nanomaterials»
Miérc. 16 julio 2025, 12:00
Sala de Conferencias, Edificio I+D+i, Campus Río Ebro
Resumen:
Organic materials offer a promising platform for realising strongly correlated phenomena due to their tuneability. Here, we present scanning probe microscopy (SPM) studies of a strongly correlated 2D kagome metal-organic framework, and of complex magnetic ground states in polyradical nanographenes.
A 2D kagome metal–organic framework (MOF) consisting of 9,10-dicyanoanthracene (DCA) molecules and Cu atoms was recently shown to have local magnetic moments on a metal surface. By growing this MOF on a decoupling monolayer of insulating hexagonal boron nitride, we demonstrate a pronounced energy gap in this material using scanning tunnelling spectroscopy. This finding is in good agreement with dynamical mean-field theory calculations suggesting that the MOF is a Mott insulator. Furthermore, via a combination of the SPM probe and periodic variations in the substrate workfunction we were able to induce small changes in electron population of the kagome bands leading to controllable Mott metal-insulator transitions. This demonstration and control of correlated electronic phases in 2D metal-organic materials is promising for prospective application in nanoelectronics or spintronics.
The recent development of nickelocene (NiCp2)-functionalised measurements has expanded the atomic-scale SPM toolkit for magnetic characterization. By performing NiCp2 inelastic electron tunnelling spectroscopy on isomeric nanographenes, we demonstrate the ability to produce unique fingerprints from distinct magnetic ground states and resolve spin-density with submolecular resolution. These findings pave the way for further magnetic characterisation of strongly correlated magnetic materials with unprecedented spatial resolution
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