Metallic monoclinic phase in VO2 induced by electrochemical gating: In situ Raman study Satyendra Nath Gupta, Anand Pal, D. V. S. Muthu, P. S. Anil Kumar and A. K. Sood EPL, 115 1 (2016) 17001 Published online: 20 July 2016 DOI: 10.1209/0295-5075/115/17001