Bilayer graphene double quantum dots tune in for single-electron control


Atomic force microscope image, showing the gate layout of the device. The source (S) and drain (D) contacts are connected to the BLG through etched vias in the hBN. The gate stack contains split gates (SG) with a separation of 50 nm and on top, separated by Al2O3, six parallel finger gates with a gate separation of 50 nm and a width of 100 nm. The gates GL and GR (color coded) are used to control the QDs discussed in this work. Credit: Nano Letters

The first demonstration of graphene double quantum dots in which it is possible to control the number of electrons down to zero has been reported in Nano Letters. Far from an abstract academic stunt, the results could prove key to future implementations of quantum computing based on graphene. “Having exact information and control over the number of electrons in the dots is essential for spin based quantum information technology,” says Luca Banszerus, a researcher at RWTH Aachen…



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