Coulomb excitations of few-layer graphene

Abstract

In recent years the two-dimensional structure materials have become many scientists’ objectives of the study due to its unique physical properties Graphene the first two-dimensional condensed matter to be researched theoretically and verified experimentally is the foundation for studying two-dimensional materials In this thesis I will use the tight-binding model to calculate band structures and use the Random Phase Approximation method (RPA) to simulate the Coulomb excitations of monolayer and multilayer doped graphene systems The Coulomb excitations of electrons which obey the momentum and energy conservations and Fermi-Dirac distribution can be classified as electron-hole single particle excitations and plasmon excitations These phenomena would be shown in the excitation spectra The properties of excitation spectra are influenced by the variables such as transferred momentum excitation frequency and Fermi energy Besides for multilayer systems the number of layers and the stacking sequence have an impact on the interlayer atomic and electronic Coulomb interactions and result in the changes in the excitation spectra These predictions can be verified by the inelastic light scattering spectroscopy and the electron energy loss spectroscopy (EELS) and are useful for understanding many-body physics

Date of Award	2017 Aug 15
Original language	English
Supervisor	Min-Fa Lin (Supervisor)