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Strongly correlated materials possess a complex energy landscape and hostmany interesting physical phenomena, including charge density waves (CDWs).CDWs have been observed and extensively studied in many materials since theirfirst discovery in 1972. Yet, they present ample opportunities for discovery.Here, we report a large tunability in the optical response of a quasi-2D CDWmaterial, 1T-TaS$_2$, upon incoherent light illumination at room temperature.We show that the observed tunability is a consequence of light-inducedrearrangement of CDW stacking across the layers of 1T-TaS$_2$. Our model, basedon this hypothesis, agrees reasonably well with experiments suggesting that theinterdomain CDW interaction is a vital knob to control the phase of stronglycorrelated materials.

Large optical tunability from charge density waves in 1T-TaS$_2$ under incoherent illumination