Light-induced chiral gauge field in 3D Dirac electrons in condensed matter

The chiral gauge field (CGF) plays a crucial role in condensed matter physics, particularly in materials known as Dirac and Weyl semimetals. Weyl semimetals arise from the breaking of time-reversal or spatial-inversion symmetries in Dirac semimetals. Recently, there has been a growing interest in manipulating these topological states by utilizing CGF through the application of light on materials. Using the framework of Floquet engineering, the impact of a circularly polarized laser on 3D Dirac electrons can be understood as the emergence of an effective CGF. In this presentation, we will discuss the latest theoretical and experimental efforts aimed at demonstrating laser-induced CGF and its implications in the field of ultrafast topological electronics.

JST CREST (Grant No. JPMJCR19T3).