Joaquín Fernández-Rossier
International Iberian Nanotechnology Laboratory, Braga (Portugal)
Departamento de Física Aplicada, Universidad de Alicante (Spain)

In this talk I will discuss the emergence of non-trivial quantum states and electronic phases in artificial lattices made by covalent assembly of nanographenes synthetized on surfaces. After a brief review of the one-dimensional case [1,2], I will focus on the case of two-dimensional lattices made with triangulenes [3,4,5], aza-triangulenes [6] and widget-spinner [7]. The electronic structure of these crystals feature finite-energy flat-bands, akin to magic-angle twisted bilayer graphene, whose origin I will discuss. I will then address the different types of magnetic phases that we predict for these crystals, including broken symmetry phases (antiferromagnetic [5], ferrimagnetic [5], half-metallic [6]) and quantum disorded states such as the valence bond crystal [7]). Experimental consequences will be also discussed.

References:
[1] Shantanu Mishra, Gonçalo Catarina, et al., Nature 598, 287 (2021).
[2] Chenxiao Zhao, Gonçalo Catarina, Jin-Jiang Zhang, et al., arXiv:2402.13590
[3] R Ortiz, G. Catarina, J. Fernández-Rossier, 2D Mater. 10, 015015 (2022).
[4] A. Delgado et al., arxiv.2301.06171
[5 ] G. Catarina, J. C. G. Henriques, A. Molina-Sánchez, A. T. Costa, and J. Fernández-Rossier, Phys. Rev. Research 5, 043226 (2023).
[6] J. C. G. Henriques, D. Jacob, A. Molina-Sánchez, G. Catarina, A. T. Costa, J. Fernández-Rossier, arXiv:2312.04938
[7] João Henriques, Mar Ferri-Cortés, Joaquín Fernández-Rossier, Nano Lett. 24, 3355 (2024).