1. Department of Material Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
2. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
3. Sandia National Laboratories, Livermore, California 94550, USA
4. Department of Physics and Astronomy, James Madison University, 901 Carrier Drive, Harrisonburg, Virginia 22807, USA