Manifestations of electron interactions in photogalvanic effect in chiral nanotubes

Details Manifestations of electron interactions in photogalvanic effect in chiral nanotubes Manifestations of electron interactions in photogalvanic effect in chiral nanotubes

2011-12-14

arxiv.org/abs/1112.3154v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

We develop a theory of circular photogalvanic effect in chiral metallic carbon nanotubes at low temperatures, where electron correlations are important. Near the absorption threshold the photovoltage exhibits a power law singularity as a function of radiation frequency. The sign and magnitude of the singularity exponent depend on the electron density and the momentum shift between the bottoms of the unoccupied and the partially occupied subbands. At low densities, when the electrons form a Wigner crystal, we obtain the photovoltage in a wide frequency interval and characterize the singularities which appear above the threshold at intervals of the Debye frequency of the plasmons.

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