Anomalous pressure behavior of tangential modes in single-wall carbon nanotubes

Details Anomalous pressure behavior of tangential modes in single-wall carbon nanotubes Anomalous pressure behavior of tangential modes in single-wall carbon nanotubes

2007-04-07

arxiv.org/abs/0704.0977v1

Phys. Rev. B. 76, 033402 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 3 pages, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.033402

Using the molecular dynamics simulations and the force constant model we have studied the Raman-active tangential modes (TMs) of a (10, 0) single-wall carbon nanotube (SWNT) under hydrostatic pressure. With increasing pressure, the atomic motions in the three TMs present obvious diversities. The pressure derivative of E1g, A1g, and E2g mode frequency shows an increased value (), a constant value (), and a negative value () above 5.3 GPa, respectively. The intrinsic characteristics of TMs consumedly help to understand the essence of the experimental T band of CNT. The anomalous pressure behavior of the TMs frequencies may be originated from the tube symmetry alteration from D10h to D2h then to C2h.

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