A Graphene Quantum Dot with a Single Electron Transistor as Integrated Charge Sensor

Details A Graphene Quantum Dot with a Single Electron Transistor as Integrated Charge Sensor A Graphene Quantum Dot with a Single Electron Transistor as Integrated Charge Sensor

2010-08-28

arxiv.org/abs/1008.4868v1

Applied. Phys. Letters 97, 262113 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 4 figures

Scientific paper

We have developed an etching process to fabricate a quantum dot and a nearby single electron transistor as a charge detector in a single layer graphene. The high charge sensitivity of the detector is used to probe Coulomb diamonds as well as excited spectrum in the dot, even in the regime where the current through the quantum dot is too small to be measured by conventional transport means. The graphene based quantum dot and integrated charge sensor serve as an essential building block to form a solid-state qubit in a nuclear-spin-free quantum world.

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