Addition Spectroscopy of Graphene Nanoribbons*

Graphene nanoribbons (GNRs) have unique electronic properties that can potentially be used to develop electron spin-based qubits.  The LaAlO3/SrTiO3 (LAO/STO) correlated nanoelectronics platform [1] enables single GNRs to be addressed both optically and electrically.  Here we use a LAO/STO-based sketched single electron transistor (SketchSET) [2] to probe the energies at which a single electron is added to a GNR.  This addition energy spectrum [3] is expected to be influenced by local electric fields from proximal sketched gates as well as global magnetic fields which can Zeeman split the energy states.  This information is complementary to other probes, e.g., THz spectroscopy [4] and STM which also provide detailed information about the electronic structures of these GNR-based spin qubit candidates.