Volume 237, 2022

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.

Graphical abstract: Petahertz charge dynamics in a correlated organic superconductor

Associated articles

Article information

Article type
Paper
Submitted
10 jan 2022
Accepted
07 fev 2022
First published
08 fev 2022

Faraday Discuss., 2022,237, 353-367

Author version available

Petahertz charge dynamics in a correlated organic superconductor

S. Iwai, Y. Kawakami, H. Itoh and K. Yonemitsu, Faraday Discuss., 2022, 237, 353 DOI: 10.1039/D2FD00004K

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