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 ground state energy as a function of a magnetic field. For a magnetic field in-plane of the quantum dot the Zemann 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 for graphene.
@article{arxiv.1002.3771,
title = {Spin States in Graphene Quantum Dots},
author = {J. Guettinger and T. Frey and C. Stampfer and T. Ihn and K. Ensslin},
journal= {arXiv preprint arXiv:1002.3771},
year = {2010}
}