Electronic excited states in bilayer graphene double quantum dots

Details Electronic excited states in bilayer graphene double quantum dots Electronic excited states in bilayer graphene double quantum dots

2011-05-10

arxiv.org/abs/1105.1912v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We report tunneling spectroscopy experiments on a bilayer graphene double quantum dot device which can be tuned by all-graphene lateral gates. The diameter of the two quantum dots are around 50 nm and the constrictions acting as tunneling barriers are 30 nm in width. The double quantum dot features addition energies on the order of 20 meV. Charge stability diagrams allow us to study the tunable inter-dot coupling energy as well as the spectrum of the electronic excited states on a number of individual triple points over a large energy range. The obtained constant level spacing of 1.75 meV is in good agreement with the expected single-particle energy spacing in bilayer graphene quantum dots. Finally, we investigate the evolution of the electronic excited states in a parallel magnetic field.

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