1. Department of Mathematics Birla Institute of Technology and Science‐Pilani Hyderabad Campus Hyderabad 500078 India
2. Departamento de Física Facultad de Ciencias Básicas Universidad de Antofagasta Casilla 170 Antofagasta Chile
3. Department of Physics Indira Gandhi Institute of Technology Sarang Dhenkanal Odisha 759146 India