Smet, Jurgen H. (Dr.)Geurs, Johannes2021-09-102021-09-1020211770002219http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-116862http://elib.uni-stuttgart.de/handle/11682/11686http://dx.doi.org/10.18419/opus-11669This dissertation studies electronic transport in graphene at high and low carrier density. At very high carrier densities, the band structure of graphene features a Van Hove singularity. Magnetotransport measurements suggest that below 110K, a pseudogap opens in graphene, combined with a Lifshitz transition. At low carrier density, it is possible to treat the electron liquid in graphene by electron hydrodynamics. A graphene Tesla valve is presented, a device that works as an electron viscometer.eninfo:eu-repo/semantics/openAccess530doctoralThesis