Current instability and diamagnetism in small-diameter carbon nanotubes

Details Current instability and diamagnetism in small-diameter carbon nanotubes Current instability and diamagnetism in small-diameter carbon nanotubes

2004-09-14

arxiv.org/abs/cond-mat/0409347v1

Phys. Rev. B 72, 073403 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, submitted to PRL

Scientific paper

10.1103/PhysRevB.72.073403

We investigate the electronic instabilities in carbon nanotubes of short radius, looking for the breakdown of the Luttinger liquid regime from the singular behavior of the charge stiffnesses at low energies. We show that such a breakdown is realized in the undoped (3,3) nanotubes through the onset of phase separation into regions with opposite electronic current. The phenomenology derived from this regime is consistent with the formation of a pseudogap in the single-particle spectrum as well as with a divergent diamagnetic susceptibility, as observed in the experiments carried out in carbon nanotubes of small diameter.

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