Superlattice-induced Minigap in Graphene Band structure Due to Underlying Periodicity

Different ways of functionalization in graphene have been already demonstrated [1-3]. In our recent work, we have investigated the influence of one dimensional periodic nanostructured substrate on graphene electronic band structure. We have shown that graphene is extremely sensitive to periodic arrays, as demonstrated on two different nanostructured substrates, namely Ir(332) and Pt (111)[4]. The observed minigaps in graphene band structure by angle-resolved photoemission spectroscopy (ARPES) is related to the spatial periodicity. In this talk, I will present, the successful preparation of graphene on periodically nanostructed substrates Ir(332) and Pt(111) and associated band gap openings in its electronic structure[5,6].

References
[1] L. Daukiya et al.,Prog. in Surf. Sci 94,1-20 (2019)
[2] M. N. Nair et al., Nano Lett. 17, 2681 (2017)
[3] I. Palacio et al., Nano Lett. 15,182 (2015)
[4] A. Celis et al., Phy. Rev. B 97,195410 (2018)
[5] A. Celis et al., Nanotechnology 31, 285601 (2020)
[6] M. N. Nair et al., (in preparation)