Santiago Galván y García

Artículos en revistas con arbitraje indizadas (Web of Science, JCR, SCOPUS)

1.- Y. Betancur-Ocampo, S. Galván y García, S. Tehuacanero-Nuñez, J. Reyes-Gasga, T. Stegmann and F. Sánchez-Ochoa. Physical Review B 111, 085431 (2025).   The deposition of a two-dimensional material on the surface of a three-dimensional crystal can generate superlattices with electronic properties modified through the proximity spin-orbit effect. In this paper, we found that Kekulé graphene superlattices are obtained by placing graphene on Cd-terminated (001)-(1×1) cadmium sulfide (CdS) surface. From an effective model of Kekulé superlattices, which is corroborated by density functional theory calculations, we identified that the puckered surface of CdS modifies the on-site energies (staggered potential) and C-C bonds, giving rise to two possible √3×√3 hexagonal superlattices, which are known as Kekulé-O graphene and Kekulé-Y with a quadratic band crossing point. Both Kekulé superlattices present spin-orbit coupling due to the interaction of graphene with the CdS surface. To guide the experimental realization of Kekulé superlattices based on graphene/CdS heterostructures, we simulate electron diffraction patterns as well as images from high-resolution transmission electron microscopy and scanning transmission electron microscopy in the mode of high-angle annular dark field. Liga a la publicación

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