1. Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA
2. Department of Physics Ohio State University Columbus OH 43210 USA
3. UES Inc. 4401 Dayton‐Xenia Rd Dayton OH 45432 USA
4. Department of Material Science and Engineering University of Michigan Ann Arbor MI 48109 USA
5. Department of Mechanical Engineering and Materials Science Yale University New Haven CT 06516 USA