title: Spin states in graphene quantum dots.
abstract: We investigate ground and excited state transport through small (d≈70  nm) graphene quantum dots. The successive spin filling of orbital states is detected by measuring the difference between ground-state energies as a function of a magnetic field. For a magnetic field in-plane of the quantum dot the Zeeman splitting of spin states is measured. The results are compatible with a g factor of 2, and we detect a spin-filling sequence for a series of states which is reasonable given the strength of exchange interaction effects expected by comparing Coulomb interaction energy and kinetic energy of charge carriers in graphene.
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland. guettinj@phys.ethz.ch
authors.forename: J
authors.initials: J
authors.lastname: Güttinger
authors.forename: T
authors.initials: T
authors.lastname: Frey
authors.forename: C
authors.initials: C
authors.lastname: Stampfer
authors.forename: T
authors.initials: T
authors.lastname: Ihn
authors.forename: K
authors.initials: K
authors.lastname: Ensslin