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机译:
Eindhoven Univ Technol, Dept Appl Phys, COBRA Inter Univ Res Inst, NL-5600 MB Eindhoven, Netherlands;
IMEC, B-3001 Louvain, Belgium;
Ioffe Physicotech Inst, St Petersburg 194021, RussiaUniv New Hampshire, Dept Phys, Durham, NH 03824 USAUniv Iowa, Opt Sci & Technol Ctr, Iowa City, IA 52242 USAUniv Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA;