The control of non-equilibrium phenomena in complex solids is an important research frontier, encompassing new effects like light induced superconductivity. Here, we show that coherent optical excitation of molecular vibrations in the organic conductor K3C60 can induce a non-equilibrium state with the optical properties of a superconductor. A transient gap in the real part of the optical conductivity and a low-frequency divergence of the imaginary part are measured for base temperatures far above equilibrium Tc=20 K. These findings underscore the role of coherent light fields in inducing emergent order.
@article{arxiv.1505.04529,
title = {An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc},
author = {M. Mitrano and A. Cantaluppi and D. Nicoletti and S. Kaiser and A. Perucchi and S. Lupi and P. Di Pietro and D. Pontiroli and M. Riccò and A. Subedi and S. R. Clark and D. Jaksch and A. Cavalleri},
journal= {arXiv preprint arXiv:1505.04529},
year = {2016}
}