D. M. Engebretson,1 W. A. A. Macedo,2,* Ivan K. Schuller,2 P. A Crowell,1 and C. Leighton3 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA 2Department of Physics, University of California-San Diego, La Jolla, California 92093, USA 3Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA sRe...
