Affiliation: | 1.Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology,Dalian,P.R. China;2.Vinca Institute of Nuclear Sciences, University of Belgrade,Belgrade,Serbia;3.Department of Applied Mathematics,University of Waterloo,Waterloo,Canada;4.Waterloo Institute for Nanotechnology, University of Waterloo,Waterloo,Canada |