The role of interplay between the potential and the ambient energies on the vibration energy harvesting Somrita Ray, Shrabani Mondal, Bikramaditya Mandal and Bidhan Chandra Bag Eur. Phys. J. B, 89 10 (2016) 224 Published online: 17 October 2016 DOI: 10.1140/epjb/e2016-70271-7