Raman spectroscopy of self-assembled Ge islands on Si T. R. Yang, M. M. Dvoynenko, Z. C. Feng and H. H. Cheng Eur. Phys. J. B, 31 1 (2003) 41-45 Published online: 27 January 2003 DOI: 10.1140/epjb/e2003-00006-x