1. Department of Chemistry Presidency University Kolkata 700073 India
2. Center for Phononics and Thermal Energy Science Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai 200092 China
3. Dipartimento di Fisica, Università di Camerino I-62032 Camerino
4. Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Wako-shi Saitama 351-0198 Japan.
5. Physics Department University of Michigan Ann Arbor Michigan 48109-1040 USA.