Kavli Affiliate: Kimberly See
| First 5 Authors: Kim H. Pham, Kim H. Pham, , ,

| Summary:
Ionic conduction in solids that exceeds 1 mS/cm is predicted to involve collective phonon-ion interactions in the crystal lattice. Here, we use theory and experiment to measure the possible contribution of collective phonon-ion modes to Li+ migration in Li0.5La0.5TiO3 (LLTO). The ab initio calculations predict that the targeted excitation of individual TiO6 rocking modes can lead to a three order of magnitude increase in the Li+ jump rate as compared to the excitation of single vibrational modes in the lattice associated with heating. Experimentally, coherently driving the TiO6 rocking via terahertz (THz) illumination leads to a ten-fold decrease in the normalized impedance compared to the excitation of acoustic and optical phonons that are associated with heating. These findings provide new insights into phonon-coupled ion migration mechanisms and material design rules for ion conductors and opto-ionic materials.
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