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MON: Monday Contributed Sessions

MON 20: Quantum Sensing and Decoherence: Contributed Session to Symposium II

MON 20.5: Talk

Monday, September 8, 2025, 17:30–17:45, ZHG009

Phonon Dynamics and Quasi-Particle Interactions in Proximitized 2D Systems — •Zamin Mamiyev, Narmina O.Balayeva, Dietrich R.T. Zahn, and Christoph Tegenkamp — Institut für Physik, Technische Universität Chemnitz

Understanding and controlling phonon behavior in two-dimensional (2D) materials is crucial for tailoring their electronic, optical, thermal, and mechanical properties. In this context, confinement epitaxy serves as a versatile approach to create chemically protected, atomically thin 2D materials while enabling the study of proximity interactions in stacked structures [1]. In this work, we investigate phonon dynamics in epitaxial graphene (EG) intercalated with H, Sn, and In, using a combination of variable-wavelength and temperature-dependent Raman spectroscopy, complemented by electron energy loss spectroscopy. Our results demonstrate that intercalation is not merely a doping mechanism but an effective route to tune vibrational properties in EG via proximity effects [2]. Detailed analysis reveals that the primary mechanism influencing phonon behavior is the modification of electron-phonon coupling (EPC), governed by charge transfer or the strength and nature of interfacial interactions. While band filling and strain induce rigid phonon shifts, altered EPC impacts phonon group velocity. Furthermore, we show that beyond atomic-scale effects, interface engineering also significantly influences the thermal conductivity of EG.
[1] Z. Mamiyev et al., 2D Materials. 11 (2024) 025013
[2] Z. Mamiyev et al, Carbon 234 (2025) 120002

Keywords: 2D systems; Proximity interactions; Quasi-particles; Plasmonics; Confinement epitaxy