1. Laboratoire des Solides Irradiés, CNRS UMR 7642, CEA-DSM-IRAMIS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau cedex, France
2. Center for Energy Harvesting Materials and Systems (CEHMS), Bio-Inspired Materials and Devices Laboratory (BMDL), Virginia Tech, Blacksburg, Virginia 24061, USA
3. Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA