1. Department of Physics and Engineering Physics, Morgan State University, Baltimore, Maryland 21251, USA
2. U.S. Army Research Laboratory, VTD, 6340 Rodman Road, Aberdeen Proving Ground, Maryland 21005-5069, USA
3. Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
4. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
5. Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29631, USA