1. Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
2. Department of Materials Science and Engineering, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Boston, Massachusetts 02139, United States
3. Department of Civil and Environmental Engineering, George Washington University, Washington, D.C. 20052, United States
4. Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States