Observation of excited states in a graphene double quantum dot
Solid State Physics Laboratory, ETH Zurich - 8093 Zurich, Switzerland
Corresponding author: email@example.com
Accepted: 10 March 2010
We study a graphene double quantum dot in different coupling regimes. Despite the strong capacitive coupling between the dots, the tunnel coupling is below the experimental resolution. We observe additional structures inside the finite-bias triangles, part of which can be attributed to electronic excited dot states, while others are probably due to modulations of the transmission of the tunnel barriers connecting the system to source and drain leads.
PACS: 73.63.Kv – Quantum dots / 73.23.Hk – Coulomb blockade; single-electron tunneling / 73.22.Pr – Electronic structure of graphene
© EPLA, 2010