Resonant optical excitation of certain molecular vibrations in κ-(BEDT-TTF)2Cu[N(CN)2]Br has been shown to induce transient superconducting-like optical properties at temperatures far above equilibrium Tc. Here, we report experiments across the bandwidth-tuned phase diagram of this class of materials, and study the Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl and the metallic compound κ-(BEDT-TTF)2Cu(NCS)2. We find non-equilibrium photoinduced superconductivity only in κ-(BEDT-TTF)2Cu[N(CN)2]Br, indicating that the proximity to the Mott insulating phase and possibly the presence of preexisting superconducting fluctuations are pre-requisites for this effect.
@article{arxiv.2106.14244,
title = {A phase diagram for light-induced superconductivity in $\kappa$-(ET)$_2$-X},
author = {M. Buzzi and D. Nicoletti and S. Fava and G. Jotzu and K. Miyagawa and K. Kanoda and A. Henderson and T. Siegrist and J. A. Schlueter and M. -S. Nam and A. Ardavan and A. Cavalleri},
journal= {arXiv preprint arXiv:2106.14244},
year = {2021}
}