Quantum Capacitance Effects in Carbon Nanotube Field-Effect Devices

Density functional numerical simulations are reported in which the non-equilibrium coherent transport properties of a coaxially gated carbon nanotube (CNT) are studied. Effects of screening properties of CNT on the channel conductance modulation are shown. Other factors which influence the CNT quant...

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Bibliographic Details
Published in:Journal of computational electronics 2005-04, Vol.4 (1-2), p.51-55
Main Authors: Latessa, L., Pecchia, A., Carlo, A. Di, Lugli, P.
Format: Article
Language:English
Subjects:
Capacitance
Carbon nanotubes
Contact stresses
Current modulation
Density of states
Transport properties
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Summary:Density functional numerical simulations are reported in which the non-equilibrium coherent transport properties of a coaxially gated carbon nanotube (CNT) are studied. Effects of screening properties of CNT on the channel conductance modulation are shown. Other factors which influence the CNT quantum capacitance beyond the density of states (DOS) are pointed out, first of all many-body effects which even cause the CNT to over-screen the gate field. Results stress the importance of a good electrostatic-design of the gate contact to obtain an effective field-effect current modulation, and suggest new interesting operation modes for quasi-one dimensional channel devices.
ISSN:1569-8025
1572-8137
DOI:10.1007/s10825-005-7106-9