Shell Filling and Trigonal Warping in Graphene Quantum Dots
Shell Filling and Trigonal Warping in Graphene Quantum Dots
Transport measurements through a few-electron circular quantum dot in bilayer graphene display bunching of the conductance resonances in groups of four, eight, and twelve. This is in accordance with the spin and valley degeneracies in bilayer graphene and an additional threefold ``minivalley degeneracy'' caused by trigonal warping. For small electron …