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Seminar on Theoretical and Computational Physics:
TitleStudies on graphene moiré superlattices: experiments and atomistic modeling
SpeakerDr. Viet-Hung Nguyen
AffiliationUniversité catholique de Louvain, Belgium
DateFriday, 19-07-2024
Time10:00 AM
LocationRoom 312A, 10 Dao Tan, Ba Dinh, Ha Noi
AbstractAssembly of 2D materials into van der Waals heterostructures has recently been a novel technique to deterministically manipulate electronic structures and, thereby, to achieve new properties and states of matter [1,2]. In these heterostructures, it is possible to design the novel band structure by mixing materials and then further controlling it by the modification of interlayer spacing [3-5] and layer rotation [6-9]. In particular, layer rotation has been demonstrated to strongly affect the band structure of graphene, both, on hexagonal boron nitride and in twisted multilayer graphene structures. In spite of the large body of research devoted to the electronic properties of these graphene moiré superlattices, little is known on the interplay between their mechanical and electronic properties. In our recent studies [10-16], such the interplay has been explored and investigated thoroughly by both experiments and atomistic calculations. On the one hand, the atomic reconstruction effects have been shown to play important roles in large moiré superlattices (usually, obtained with small rotations between layers) and are mandatory to be taken into account in electronic calculations. On the other hand, these effects are foundations to explore novel electronic features in the considered graphene moiré systems. These studies thus present important contributions, which shed light on the properties of graphene based moiré superlattices and can motivate exploration of novel features in van der Waals systems of other 2D materials.

References: [1] Nature 499, 419-425 (2013); [2] Science 353, aac9439 (2016); [3] Phys. Rev. B 98, 085144 (2018); [4] Science 363, eaav1910 (2019); [5] Nature 557, 404-408 (2018); [6] PNAS 108, 12233-12237 (2011); [7] Nature 556, 43-50 (2018); [8] Nat. Mater. 19, 1265-1275 (2020); [9] Nat. Phys. 8, 382-386 (2012); [10] 2D Mater. 8, 035046 (2021); [11] Nature 590, 405-409 (2021); [12] J. Phys. Mater. 5, 034003 (2022); [13] Nat. Commun. 14, 8178 (2023); [15] Nano Lett. 22, 6069-6074 (2022); [15] 2D Mater. 11, 025023 (2024); [16] arXiv.2401.08265
Host personTrịnh Xuân Hoàng