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arXiv · 2607.28297

Effects of gold cluster intercalation in graphene: stationary waves and modified QPI features

Cristina Bena·Marion Cranney·Poonam Kumari·Alberto Zobelli·Laurent Simon
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Abstract

Gold intercalation beneath epitaxial graphene on SiC produces a cluster phase with unusual standing waves and quasiparticle-interference (QPI) features concentrated near the graphene M points. We show that this can be explained by Au intercalation below graphene hollow sites, which induces a local scattering potential on the six surrounding carbon atoms. Within a T-matrix treatment, this ring-like scatterer produces elliptical QPI structures centered near M, in agreement with the experimental FT-STS measurements. We further show that these QPI features naturally generate the nearly stationary standing-wave patterns observed in real space. Finally, we compute the local-density-of-states contrast on and off a small cluster and show that its sign and magnitude are strongly energy dependent, consistent with the experimental observations.

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Cristina Bena, Marion Cranney, Poonam Kumari, Alberto Zobelli, Laurent Simon. 2026-07-30. Effects of gold cluster intercalation in graphene: stationary waves and modified QPI features. https://arxiv.org/abs/2607.28297

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