https://doi.org/10.1140/epjb/e2004-00092-2
Strain induced correlation gaps in carbon nanotubes
Institut de théorie des phénomènes physiques,
École Polytechnique Fédérale de Lausanne,
BSP, 1015 Lausanne, Switzerland
Corresponding author: a t.gloor@epfl.ch
Received:
13
October
2003
Revised:
29
December
2003
Published online:
20
April
2004
We calculate the change in the correlation gap of armchair carbon
nanotubes with uniaxial elastic strain. We predict that such a stretching
will enlarge the correlation gap for all carbon nanotubes by a change
that could be as large as several 
per percent of
applied strain, in contrast
with pure band structure calculations where no change
for armchair carbon nanotubes is predicted. The correlation effects
are considered within a self-consistent Hartree-Fock approximation
to the Hubbard model with on-site repulsion only.
PACS: 62.25.+g – Mechanical properties of nanoscale materials / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 71.20.Tx – Fullerenes and related materials; intercalation compounds
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
