1. CSIR‐National Physical Laboratory Dr. K.S. Krishnan Marg New Delhi 110012 India
2. Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
3. Department of Physics Indian Institute of Technology Roorkee Roorkee Uttarakhand 247667 India
4. Functional Materials and Microsystems Research Group and the Micro Nano Research Facility RMIT University Melbourne VIC 3001 Australia
5. Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai 400076 India