Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 21: Graphene: Electronic Structure and Excitations (joint session O/HL)

HL 21.7: Talk

Tuesday, March 18, 2025, 12:00–12:15, H6

Enhanced light-matter interactions via Sn nanoislands on epitaxial graphene — •Zamin Mamiyev, Narmina Balayeva, Dietrich R.T. Zahn, and Christoph Tegenkamp — Institut für Physik, Technische Universität Chemnitz

Surface-enhanced Raman scattering (SERS) is an advanced technique for coupling light into quasiparticle excitations in low-dimensional materials, offering promising applications in trace detection, enhanced light-matter interactions, photonic energy harvesting, and catalytic processes. Recent studies in this field have focused on integrating noble metal nanostructures with graphene.

In this study, we investigate a novel SERS platform utilizing tin (Sn) nanoislands to enhance graphene Raman signals by up to two orders of magnitude. We examine the SERS performance on Sn-intercalated charge-neutral and intrinsically doped epitaxial monolayer graphene (MLG) on SiC(0001). The increase in the Raman cross-section and enhanced intensity is accompanied by spectral shifts, which may be correlated with the localized surface plasmons (LSPs) of Sn nanoislands as well as dynamic charge transfer between the Sn particles and graphene. This dynamic charge redistribution, primarily determined by the doping concentration and interface interactions, enables control over the SERS response. Additionally, plasmonic and thermalization-induced carrier density propagation across µm ranges indicates efficient coupling between localized and propagating plasmons.

[1] Z. Mamiyev and C. Tegenkamp, 2D Materials. 11, 025013 (2024)

[2] Z. Mamiyev and C. Tegenkamp, Surf. & Int. 34, 102304 (2022)

Keywords: SERS; Plasmonics; Epitaxial graphene; Proximity interaction