Electrostatic confinement of electrons in graphene nano-ribbons

Abstract

Coulomb blockade is observed in a graphene nanoribbon device with a top gate. When two pn junctions are formed via the back gate and the local top gate, electrons are confined between the pn junctions which act as the barriers. When no pn junctions are induced by the gate voltages, electrons are still confined, as a result of strong disorder, but in a larger area. Measurements on five other devices with different dimensions yield consistent results.

4 figures, 1 table, 4.4pages

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• Graphene-based charge sensors
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• Equilibration in closed quantum systems: Application to spin qubits
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• Electric control of tunneling energy in graphene double dots
• Insulating state in low-disorder graphene nanoribbons
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• Charging graphene nanoribbon quantum dots