We perform momentum mapping of the Raman scattering of individual single-walled carbon nanotubes (SWNTs) or thin ropes of SWNTs enhanced by surface plasmons sustained by either a linear chain of nanoantennas or flower-shaped nanoparticles. The momentum spectroscopy of Raman scattering of the carbon nanotube (CNT) demonstrates the direct verification of momentum selection rules and identifies the characteristic bands of the molecules or the nanomaterials under scrutiny. The characteristic vibrational signatures of the D, G−, and G bands provide an isotropic response in k-space irrespective of the arrangement of the enhancing platform. However, other dispersive or double resonance bands, such as D−, D+, D′, M, and iTOLA bands appear as a dipolar emission oriented towards the long axis of the CNT regardless of the CNT orientation but strongly depend on the patterning of enhancement of the electromagnetic field.
The cylindrically gated (10,0) carbon nanotube field effect transistor having n-i-n device structure has been simulated by using the non-equilibrium Green function method and self-consistent calculations. The gate bias polarity and device temperature have been found to significantly influence the drain current obtained from energy-position resolved current spectrum under ballistic transport limit through simulations. The effect of temperature on drain current is seen to be more pronounced in thermionic emission as compared to band-to-band tunnelling.
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