1. Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
2. Center for Innovation and Research in Engineering and Technology, and CICFIM−Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, NL 66450, México
3. International Iberian Nanotechnology Laboratory, Avenida Mestre Jose Veiga, Braga 4715, Portugal