"Exploring Quantum Properties in 2D Organic Materials"

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 [3]. 

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 [6]. 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).

References:

[1] Zhang, L. Z. et al. Nano Lett. 16, 2072?2075 (2016)

[2] Zhang, X., et al. Nano Lett. 17, 6166?6170 (2017)

[3] Jiang, D., et al. Nano Lett. 9, 4019?4024 (2009)

[4] Piquero-Zulaica, I. et al. Phys. Rev. Lett. 123, 266805 (2019)

[5] Moreno, C. et al. Science 360, 199?203 (2018)

[6] Hernández-López, L., Piquero-Zulaica, I. et al. Nanoscale 135216 (2021)

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