Polarization resolved magneto-Raman scattering of graphene-like domains on natural graphite

TL;DR

This study investigates the polarization-resolved magneto-Raman scattering of graphene-like domains on natural graphite, revealing electronic excitations, Landau level splitting, and phonon-electron interactions at high magnetic fields and varying temperatures.

Contribution

It provides new insights into the electronic and vibrational properties of graphene-like regions on natural graphite using polarization-resolved magneto-Raman spectroscopy.

Findings

Observation of distinct electronic excitation series

Splitting of inter-Landau level signals

Interaction between phonons and electronic excitations

Abstract

The micro-Raman scattering response of a graphene-like location on the surface of bulk natural graphite is investigated both at $T=\unit{4.2}{K}$ and at room temperature in magnetic fields up to 29 T. Two different polarization configurations, co-circular and crossed-circular, are employed in order to determine the Raman scattering selection rules. Several distinct series of electronic excitations are observed and we discuss their characteristic shapes and amplitudes. In particular, we report a clear splitting of the signals associated with the inter-Landau level excitations $-n\rightarrow+n$. Furthermore, we observe the pronounced interaction of the zone-center E$_{\text{2g}}$-phonon with three different sets of electronic excitations. Possible origins for these graphene-like inclusions on the surface of bulk graphite are discussed.