  The interaction of light with correlated Weyl semimetals (WSMs) provides a
unique platform for exploring non-equilibrium phases and fundamental properties
such as chirality. Here, we investigate the structural chirality of (TaSe4)2I,
a correlated WSM, under weak optical pumping using Circular Photogalvanic
Effect (CPGE) measurements and Raman spectroscopy. Surprisingly, we find that
there is a loss of chirality in (TaSe4)2I above a threshold light intensity. We
suggest that the loss of chirality is due to an optically driven phase
transition into an achiral structure distinct from the ground state. This
structural transformation is supported by fluence-dependent Raman spectra,
revealing a new peak at low pump fluences that disappears above the threshold
fluence. The loss of chirality even at low optical powers suggests that the
system quickly transitions into a non WSM phase, and also highlights the
importance of considering light-induced structural interactions in
understanding the behavior of correlated systems. These studies showcase that
even low excitation powers can be used to control the properties of correlated
topological systems, opening up new avenues for low power optical devices.
