Observation of excited states in a graphene quantum dot
arXiv:0807.2710 · doi:10.1063/1.3064128
Abstract
We demonstrate that excited states in single-layer graphene quantum dots can be detected via direct transport experiments. Coulomb diamond measurements show distinct features of sequential tunneling through an excited state. Moreover, the onset of inelastic cotunneling in the diamond region could be detected. For low magnetic fields, the positions of the single-particle energy levels fluctuate on the scale of a flux quantum penetrating the dot area. For higher magnetic fields, the transition to the formation of Landau levels is observed. Estimates based on the linear energy-momentum relation of graphene give carrier numbers of the order of 10 for our device.
3 pages, 3 figures
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- Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots
- Inner and outer edge states in graphene rings: A numerical investigation
- Boundary problems for Dirac electrons and edge-assisted Raman scattering in graphene
- Time-resolved charge detection in graphene quantum dots
- Transition to Landau Levels in Graphene Quantum Dots
- Artifical atoms in interacting graphene quantum dots
- Transport through a strongly coupled graphene quantum dot in perpendicular magnetic field
- Signatures of Wigner molecule formation in interacting Dirac fermion quantum dots