1. Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur 342030, India
2. Department of Physics, Indian Institute of Technology Jodhpur, Jodhpur 342030, India
3. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
5. Anhui Provincial Key Laboratory of Photonic Device and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China