Optical Spectroscopy of Graphite and Graphene under Megagauss Magnetic Field
type: Dataset
description: Since its experimental discovery in 2004, graphene (a single layer of graphite) has attracted a lot of attention. It also leads to a renewed interest in graphite. Subsequently, both these materials have extensively been studied using different experimental techniques. In this thesis we demonstrate that transmission measurements performed in extremely high magnetic field (> 1 million times the earth's magnetic field) are a very useful tool to investigate the electronic structure of graphene and graphite. In particular, we will demonstrate that electron-hole asymmetry in graphite is caused by the often neglected free-electron kinetic energy term. This term is also present in the Hamiltonian describing electronic properties of graphene, hence it will lead to an asymmetry in graphene. Additionally, using near-infrared and visible sources from 200meV to 2eV we observe strong series of interband transitions in graphite between the four interlayer split bands (E3+, E3-, E1 and E2) up to 150 T at room temperature. The K-point electron resonances can be described well using an effective bilayer graphene model and the H-point transitions correspond to monolayer graphene. It is demonstrated that this can be reduced to a single measurement of the dispersion relation which is described by the relativistic formula where E2=m02v4 + p2v2 with v the Fermi velocity and a single particle rest energy m0v² of 385 meV for the K-point electrons and zero as expected for the H-point.
landing page: https://theses.hal.science/tel-00777855
keyword: asymetrie-electron-trou
keyword: asymmetry
keyword: champ-magnetique
keyword: dirac-fermions
keyword: electron-hole
keyword: fermions-de-dirac
keyword: graphene
keyword: graphite
keyword: infoeu-reposemanticsdoctoralthesis
keyword: magnetic-field
keyword: megagauss
keyword: optical-spectroscopy
keyword: physcondgasphysics-physicscondensed-matter-cond-matquantum-gases-cond-matquant-gas
keyword: relativite
keyword: relativity
keyword: spectroscopie-optique
keyword: theses
issued: 2026-05-15T04:43:32.497150
modified: 2026-05-15T04:43:32.497155
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Optical Spectroscopy of Graphite and Graphene under Megagauss Magnetic Field
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00777855
issued: 2026-05-15T04:43:32.506040
modified: 2026-05-15T04:43:32.460136