Affiliation: | 1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA 2. Institut für Physik and Institut für Mikro- und Nanotechnologien, Technische Universit?t Ilmenau, Ilmenau, 98684, Germany 3. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA 4. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA
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