Symmetry breaking driven by petahertz electron acceleration in a centrosymmetric organic superconductor
Abstract
Charge acceleration during an intense light field application to solids attracts much attention as elementary processes in high-harmonic generation and photoelectron emission [1-7]. For manipulating such attosecond dynamics of charge, carrier-envelope-phase (CEP:relative phase between carrier oscillation of light field and its envelope function) control has been employed in insulators, nanometal and graphene [8-10]. In superconducting materials, collective control of charge motion is expected because of its strongly coherent nature of quasi-particles. Here, in a layered organic superconductor, second harmonic generation (SHG) is observed by using a single-cycle 6 femtosecond near infrared pulse, which is in contrast to the common belief that even harmonics are forbidden in the centrosymmetric system. The SHG shows a CEP sensitive nature and an enhancement near the superconducting temperature. The result and its quantum many-body analysis indicate that a polarized current is induced by non-dissipative acceleration of charge, which is amplified by superconducting fluctuations. This will lead to petahertz functions of superconductors and of strongly correlated systems.
Keywords
Cite
@article{arxiv.2007.10762,
title = {Symmetry breaking driven by petahertz electron acceleration in a centrosymmetric organic superconductor},
author = {Y. Kawakami and T. Amano and H. Ohashi and H. Itoh and Y. Nakamura and H. Kishida and T. Sasaki and G. Kawaguchi and H. M. Yamamoto and K. Yamamoto and S. Ishihara and K. Yonemitsu and S. Iwai},
journal= {arXiv preprint arXiv:2007.10762},
year = {2020}
}
Comments
Anotherversion hase been accepted in Nature communications