Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal Co$_3$Sn$_2$S$_2$
Abstract
Weyl semimetals can emerge from Dirac semimetals when the time-reversal or spatial-inversion symmetries are broken. Recently, it has been proposed based on the Floquet theory that Dirac semimetals can be converted into Weyl semimetals even by shining circularly polarized light (CPL). Here we have investigated the possibility of such a Dirac-Weyl conversion by measuring the CPL-induced anomalous Hall conductivity (AHC) in a massive 3D Dirac semimetal CoSnS in the paramagnetic phase using ultrafast mid-infrared pump-terahertz Faraday rotation probe spectroscopy. We find that the field-strength and driving frequency dependence of the observed AHC is well accounted for by CPL-induced nonzero Berry curvature associated with the splitting of the Dirac bands as predicted by the Floquet theory. The estimated splitting of the Dirac bands reaches about 60 % of the mass gap and the calculated CPL-induced AHC quantitatively reproduces the experimental observation, demonstrating a promising route toward the realization of Floquet-Weyl states from massive Dirac semimetals.
Keywords
Cite
@article{arxiv.2209.11932,
title = {Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal Co$_3$Sn$_2$S$_2$},
author = {Naotaka Yoshikawa and Shun Okumura and Yoshua Hirai and Kazuma Ogawa and Kohei Fujiwara and Junya Ikeda and Akihiro Ozawa and Takashi Koretsune and Ryotaro Arita and Aditi Mitra and Atsushi Tsukazaki and Takashi Oka and Ryo Shimano},
journal= {arXiv preprint arXiv:2209.11932},
year = {2025}
}