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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology



Wednesday, 28 June 2006
(at 12:15 in room Phy 8.1.09)
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Journal-Club
Negative quantum capacitance of gated carbon nanotubes

Norbert Nemec

Institut für Theoretische Physik
Universität Regensburg
   






(From doi: 10.1103/PhysRevB.72.035455): Atomistic density functional theory (DFT) calculations of the capacitance between a metallic cylindric gate and a carbon nanotube (CNT) are reported. We find that the quantum capacitance of the CNT becomes negative as the CNT carrier density is reduced. This corresponds to an unconventionally high charge accumulation on the CNT, which in turn overscreens the external gate field. The relationship between this behavior and the predominance of the attractive exchange energy contribution is pointed out.



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Invited by G. Cuniberti, C. Strunk (JClub)

Within the Journal Club 52 478

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