1. Department of Chemical Engineering, University of New Hampshire, Durham, New Hampshire 03824, Condensed Matter Physics and Materials Science Department, Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, Department of Physics, Yeshiva University, New York, New York 10016, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, and Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794