Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Plasmonics and nanooptics: Light-matter interaction, spectroscopy III

O 79.6: Vortrag

Donnerstag, 12. März 2026, 11:45–12:00, HSZ/0403

Raman Studies of Proximity Effects in Epitaxial Graphene: Emphasis on Strong Light-Matter Coupling — •Zamin Mamiyev, Narmina O.Balayeva, Dietrich R.T. Zahn, and Christoph Tegenkamp — Institut für Physik, Technische Universität Chemnitz

Proximity engineering provides a route to tailor the electronic and vibrational properties of epitaxial graphene without introducing structural disorder. Because phonons and electronic states in graphene are strongly coupled, Raman spectroscopy provides a reliable approach to studying the quasiparticle dynamics and their modification in graphene.

In this work, we investigate how Sn and In intercalation, their nanoscale distributions, and the resulting interfacial reconstructions modify the phonon dynamics of quasi-free monolayer graphene on SiC(0001), particularly focusing on the plasmonically enhanced light-matter interaction regimes, such as in surface- (SERS) and tip- (TERS) enhanced Raman spectroscopies. Using resonance µ-Raman and TERS, we map the charge doping, electron-phonon coupling, and anharmonicities with high spectral and spatial resolution. Combined with electron diffraction, scanning tunneling microscopy (STM), and atomic force microscopy (AFM), our measurements allow us to study the optical fingerprints of strain, charge transfer, and symmetry-breaking that originate from distinct metal-intercalated interfaces and confined 2D metallic layers [1-2]. [1] Z. Mamiyev et.al., Adv. Optical. Mat. e00979 (2025); [2] Z. Mamiyev et.al., Carbon 234, 120002 (2025)

Keywords: Raman spectroscopy; Light-matter interaction; Proximity interactions; Epitaxial graphene; Intercalation