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O: Fachverband Oberflächenphysik

O 62: Graphene: Electronic structure, excitations, etc. (joint session O/TT)

O 62.3: Vortrag

Mittwoch, 11. März 2026, 15:30–15:45, HSZ/0204

Quasiparticle Interferences in 30^∘-twisted graphene quasicrystal — •Jean-Maxime Schlachter¹, Ahmed El Alouani², Vincent S Renard², Abhishek Karn¹, Ileana Florea², Stéphane Vézian², Adrien Michon², Clemens B Winkelmann¹, and Vincent T Renard¹ — ¹Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, 38000 Grenoble, France — ²CNRS-CRHEA, Université Côte d’Azur, rue B. Grégory, 06560 Valbonne, France

Quasicrystals are materials that have clean diffraction pattern but no translational symmetry. The advent of van der Waals stacking has opened the possibility to engineer quasicrystals. For example, the moiré pattern in 30^∘-twisted graphene bilayers has 12-fold rotational symmetry which is not compatible with translation symmetry in 2D, hence it is a quasicrystal (1). Studying this system gives insight into the behavior of Dirac fermions in 2D quasicrystals. ARPES experiments (2) demonstrated the existence of multiple Dirac cone replicas, originating from the incommensurate interlayer coupling. The goal of this study is to determine to what extend these Dirac cone replicas influence the electronic properties of the Dirac fermions. Our low temperature scanning tunneling microscope (STM) experiments evidence the replicated Dirac cones by specific patterns in the local density of states patterns associated with scattering between them, contrary to previous STM experiments (3).

(1) P. Moon et al., Phys. Rev. B, 99, 16, :165430 (2019) ; (2) S. J. Ahn et al., Science, 361, 6404, :782-786 (2018) ; (3) C. Yan et al., 2D Mater., 6, 4, :045041 (2019)

Keywords: Graphene; Quasicrystal; Dirac cones; Interlayer diffusion