Terahertz detection mechanism and contact capacitance of individual metallic single-walled carbon nanotubes

Details Terahertz detection mechanism and contact capacitance of individual metallic single-walled carbon nanotubes Terahertz detection mechanism and contact capacitance of individual metallic single-walled carbon nanotubes

2012-03-28

arxiv.org/abs/1203.6290v1

Appl. Phys. Lett. 100, 163503 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 figures, 1 table

Scientific paper

We characterize the terahertz detection mechanism in antenna-coupled metallic single-walled carbon nanotubes. At low temperature, 4.2 K, a peak in the low-frequency differential resistance is observed at zero bias current due to non-Ohmic contacts. This electrical contact nonlinearity gives rise to the measured terahertz response. By modeling each nanotube contact as a nonlinear resistor in parallel with a capacitor, we determine an upper bound for the value of the contact capacitance that is smaller than previous experimental estimates. The small magnitude of this contact capacitance has favorable implications for the use of carbon nanotubes in high-frequency device applications.

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