1. Department of Physics, University of North Texas, Denton, Texas 76203, United States
2. Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, CDMX 04510, Mexico
3. Department of Chemistry and Biochemistry, Texas Christian University, TCU Box 298860, Fort Worth, Texas 76129, United States