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Theory of graphene–insulator–graphene tunnel junctions

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3 Author(s)
de la Barrera, Sergio C. ; Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 ; Gao, Qin ; Feenstra, Randall M.

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Graphene–insulator–graphene vertical tunneling structures are discussed from a theoretical perspective. Momentum conservation in such devices leads to highly nonlinear current–voltage characteristics, which with gates on the tunnel junction form potentially useful transistor structures. Two prior theoretical treatments of such devices are discussed; the treatments are shown to be formally equivalent, although some differences in their implementations are identified. The limit of zero momentum conservation in the theory is explicitly considered, with a formula involving the density-of-states of the graphene electrodes recovered in this limit. Various predictions of the theory are compared to experiment.

Published in:

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:32 ,  Issue: 4 )