On the role of interband surface plasmons in carbon nanotubes |
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Authors: | I V Bondarev L M Woods A Popescu |
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Institution: | 1.Physics Department,North Carolina Central University,Durham,USA;2.Physics Department,University of South Florida,Tampa,USA |
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Abstract: | We review the properties of collective surface excitations—excitons and interband plasmons—in single-walled and double-walled
carbon nanotubes. We show that an electrostatic field applied perpendicular to the nanotube axis can control the exciton-plasmon
coupling in individual small-diameter (≲nm) singlewalled nanotubes, both in the linear excitation regime and in the non-linear
excitation regime with the photoinduced biexcitonic states formation. For double-walled carbon nanotubes, we report a profound
effect of interband surface plasmons on the inter-tube Casimir force at tube separations similar to their equilibrium distances.
Strong overlapping plasmon resonances from both tubes warrant their stronger attraction. Nanotube chiralities possessing such
collective excitation features will result in forming the most favorable innerouter tube combination in double-walled carbon
nanotubes. These findings pave the way for the development of new generation of tunable optoelectronic and nano-electromechanical
device applications with carbon nanotubes. |
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