Growth of Si on Si(1 1 1)-7 × 7 at room temperature under laser substrate excitation Ibrahim El-Kholy and Hani E. Elsayed-Ali Eur. Phys. J. Appl. Phys., 69 1 (2015) 10301 Published online: 14 January 2015 DOI: 10.1051/epjap/2014140126