@article{9563a09ffffe4f7786506a0ab11d3c1a,
title = "Petahertz charge dynamics in a correlated organic superconductor",
abstract = "We report an observation of stimulated emission induced by a nearly single-cycle 6 fs near infrared electric field of 10 MV cm−1 in an organic superconductor (κ-(h-ET)2Cu[N(CN)2]Br). The stimulated emission is attributed to a non-linear synchronized coherent charge oscillation. We also report that, in the same organic superconductor, a light-induced current before the scattering time shows up as carrier-envelope phase (CEP)-sensitive second harmonic generation (SHG). This unconventional SHG in the centrosymmetric compound is regarded as a light induced spatial symmetry breaking. These ultrafast optical non-linearities induced by petahertz charge oscillations show anomalous enhancements around the superconducting transition temperature (11.6 K). These results indicate that the microscopic mechanism of superconducting fluctuations is closely related to the Coulomb repulsive interaction in this compound.",
author = "Shinichiro Iwai and Yohei Kawakami and Hirotake Itoh and Kenji Yonemitsu",
note = "Funding Information: The authors thank Professor T. Sasaki (Institute for Materials Research, Tohoku University) and Professor H. M. Yamamoto (Institute for Molecular Science) for providing the single crystals and a thin film of κ-(h-ET)2Cu[N(CN)2]Br. The authors also thank Professor H. Kishida (Nagoya University) for measuring and analyzing the steady state optical spectra. This work was supported by JST CREST (JPMJCR1901), MEXT Q-LEAP (JPMXS0118067426). Funding Information: The authors thank Professor T. Sasaki (Institute for Materials Research, Tohoku University) and Professor H. M. Yamamoto (Institute for Molecular Science) for providing the single crystals and a thin film of κ-(h-ET)Cu[N(CN)]Br. The authors also thank Professor H. Kishida (Nagoya University) for measuring and analyzing the steady state optical spectra. This work was supported by JST CREST (JPMJCR1901), MEXT Q-LEAP (JPMXS0118067426). 2 2 Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry.",
year = "2022",
month = feb,
day = "8",
doi = "10.1039/d2fd00004k",
language = "English",
volume = "237",
pages = "353--367",
journal = "Faraday Discussions",
issn = "1364-5498",
publisher = "Royal Society of Chemistry",
}