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Volumn 82, Issue 4, 2010, Pages

Hot electron transport in suspended multilayer graphene

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EID: 77956694163     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.045411     Document Type: Article
Times cited : (20)

References (32)
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  • 23
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    • The nominal conductivity per layer for our devices is relatively low considering the nearly ballistic transport in short-channel multilayers (as suggested by frequently observed Fabry-Perot oscillations). This can be attributed to the device geometry with only the bottom layer contacting electrodes. Electrons have to tunnel from the first bottom layer to upper layers in order for the upper layers to contribute to the conduction. In the case of diffusive transport in large scale multilayers, scattering enhances the probability for electrons to leak into upper layers. But for short-channel devices, the probability for interlayer scattering is limited, leading to a low nominal conductivity per layer. On the other hand, for ballistic transport in submicron flakes, it is reasonable to observe overall conductance in the order of e2 /h (∼40μS ) since the energy levels are quantized and only one or a few modes contribute to the conductance.
    • The nominal conductivity per layer for our devices is relatively low considering the nearly ballistic transport in short-channel multilayers (as suggested by frequently observed Fabry-Perot oscillations). This can be attributed to the device geometry with only the bottom layer contacting electrodes. Electrons have to tunnel from the first bottom layer to upper layers in order for the upper layers to contribute to the conduction. In the case of diffusive transport in large scale multilayers, scattering enhances the probability for electrons to leak into upper layers. But for short-channel devices, the probability for interlayer scattering is limited, leading to a low nominal conductivity per layer. On the other hand, for ballistic transport in submicron flakes, it is reasonable to observe overall conductance in the order of e 2 / h (∼ 40 μ S) since the energy levels are quantized and only one or a few modes contribute to the conductance.


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