Long-wavelength, confined optical phonons in InAs nanowires probed by Raman spectroscopyM. Cantoro, A. V. Klekachev, A. Nourbakhsh, B. Sorée, M. M. Heyns and S. De GendtEur. Phys. J. B, 79 4 (2011) 423-428DOI: https://doi.org/10.1140/epjb/e2011-10705-2