| Institution: | 1. Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China), Fax: (+86)?551‐559‐1434;2. Department of Mechanical & Industrial Engineering, Northeastern University, Boston, MA 02115 (USA);3. Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180 (USA);4. Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77005 (USA) |
