Intersubband Edge Singularity in Metallic Nanotubes

Details Intersubband Edge Singularity in Metallic Nanotubes Intersubband Edge Singularity in Metallic Nanotubes

2011-04-10

arxiv.org/abs/1104.1743v2

Phys. Rev. Lett. 107, 116804 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure (final version, discussion of Sommerfeld factor and Ref. 11 added)

Scientific paper

10.1103/PhysRevLett.107.116804

Tunneling density of states of both the massless and massive (gapped) particles in metallic carbon nanotubes is known to have anomalous energy dependence. This is the result of coupling to multiple low-energy bosonic excitation (plasmons). For both kinds of particles the ensuing effect is the suppression of the density of states by electron-electron interactions. We demonstrate that the optical absorption between gapless and gapped states is affected by the many-body effects in the opposite way. The absorption probability is enhanced compared with the non-interacting value and develops a power-law frequency dependence with the exponent -0.2 for typical nanotubes.

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