Circular dichroism in Floquet Chern insulator via high-order harmonics spectroscopy

Jeail Kim; Dasol Kim; Dong Eon Kim; Alexis Chacón

doi:10.1088/1361-648X/ad0015

Circular dichroism in Floquet Chern insulator via high-order harmonics spectroscopy

J Phys Condens Matter. 2023 Oct 20;36(3). doi: 10.1088/1361-648X/ad0015.

Authors

Jeail Kim^{1

2}, Dasol Kim^{1

2}, Dong Eon Kim^{1

2}, Alexis Chacón^{1

2}

Affiliations

¹ Department of Physics and Center for Attosecond Science and Technology, POSTECH, 77, Pohang 37673, Republic of Korea.
² Max Planck POSTECH/KOREA Research Initiative, Pohang 37673, Republic of Korea.

PMID: 37860915
DOI: 10.1088/1361-648X/ad0015

Abstract

High-order harmonics (HOHs) spectroscopy is attracting the attention of the condensed matter community, mostly because the HOHs spectrum encode the material property. Topological materials are of interest for both basic research and advanced technologies because of their robust properties against dissipation and perturbations. Floquet engineering technique have been demonstrated to be a unique tool to manipulate topological phase. In this paper, we apply HOH spectroscopy to characterize the Floquet state via the circular dichroism (CD). We find that the CD of the co-rotating harmonics is sensitive to Floquet topological states.

Keywords: Floquet; high order harmonics; topological insulator; ultrafast dynamics.