1. Department of Physics and Electronics, University of Puerto Rico-Humacao, 100 Road 908 CUH Station, Humacao, PR 00791, Institute for Functional Nanomaterials, University of Puerto Rico-Rio Piedras, Facundo Bueso Building, Rio Piedras, PR 00931, Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, P.O. Box 880111, Lincoln, Nebraska 68588-0111, Department of Engineering Mechanics, W306 Nebraska Hall, University of Nebraska, Lincoln,...