Affiliation: | 1. Shanghai Institute of Optics &2. Fine Mechanics, Academia Sinica , P.O. Box, 800-211, Shanghai, 201800, P. R. China;3. Department of Physics , Mesoscopic Physics Laboratories, Peking University , Beijing, 100871, P.R. China;4. Fine Mechanics, Academia Sinica , P.O. Box, 800-211, Shanghai, 201800, P. R. China |