Bandgap modulation of narrow-gap carbon nanotubes in a transverse electric field D. Gunlycke, C. J. Lambert, S. W. D. Bailey, D. G. Pettifor, G. A. D. Briggs and J. H. Jefferson Europhys. Lett., 73 5 (2006) 759-764 Published online: 18 January 2006 DOI: 10.1209/epl/i2005-10446-x