Who: Ignacio Piquero-Zulaica, Technical University of Munich, Garching, Germany
Place: Online Seminar, Donostia International Physics Center
Date: Friday, 23 April 2021, 12:00
Recently, exciting theoretical predictions for single layer two-dimensional metal organic frameworks (2D-MOFs) such as organic topological insulators (OTIs), quantum anomalous Hall effect, ferromagnetism and superconductivity have been proposed [1,2]. These set the grounds for building next generation 2D organic quantum materials.
In this line, another fascinating example are the so-called nanoporous graphene structures (NPGs). Theoretical studies have predicted that the insertion of nanosize pores into graphene can turn it into a semiconductor and from being impermeable into a very efficient molecular-sieve membrane .
Such 2D-MOFs and NPGs can be successfully grown on surfaces by molecular self-assembly and via the lateral fusion of bottom-up synthesized graphene nanoribbons [4,5].In this talk, I will show that the DCA-Cu 2D-MOF, a predicted OTI, can be grown on Cu(111) (A). Despite developing a kagome multi-band, the expected topological edge-states are absent . In this line, I will also explore the Dirac and flat bands that develop for the Ext-TEB-Ag 2D organometallic polymer grown on Ag(111) (B). Finally, I will present the on-surface synthesis of an electronically isotropic NPG structure (C).
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 Piquero-Zulaica, I. et al. Phys. Rev. Lett. 123, 266805 (2019)
 Moreno, C. et al. Science 360, 199?203 (2018) Hernández-López, L., Piquero-Zulaica, I. et al. Nanoscale 13, 5216 (2021)