1. Materials Science Centre, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India
2. Condensed Matter Theory and Computational Lab, Department of Physics, IIT Madras, Chennai 600036, India
3. Center for Atomistic Modeling and Materials Design, IIT Madras, Chennai 600036, India
4. Department of Electrical and Computer Engineering, University of Alberta, Edmonton AB T6G 1H9, Canada