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We systematically studied in-plane optical conductivity ofFeSe$_{1-x}$Te$_{x}$ thin films fabricated on CaF$_{2}$ substrates for $x$ = 0,0.1, 0.2, and 0.4. This system shows a large enhancement of superconductingtransition temperature $T_{\mathrm{c}}$ at $x \sim$ 0.2 and a gentle decreasein $T_{\mathrm{c}}$ with further increasing $x$. The low-energy opticalconductivity spectrum is described by the sum of narrow and broad Drudecomponents, associated with coherent and incoherent charge dynamics,respectively. With increasing Te content, the spectral weight of the narrowDrude component decreases, while the total weight of the two Drude componentsincreases. As a consequence, the fraction of the narrow Drude weightsignificantly decreases, indicating that Te substitution leads to strongerelectronic correlations. Below the nematic transition temperature, the narrowDrude weight decreases with decreasing temperature. This indicates thereduction of the coherent carrier density, resulting from the Fermi-surfacemodification induced by the development of the orbital order. The reduction ofthe narrow Drude weight with temperature stopped at $x \sim$ 0.2, correspondingto the disappearance of the nematic transition. Our result suggests that theincrease in the coherent carrier density induced by the suppression of thenematic transition gives rise to the enhancement of $T_{\mathrm{c}}$. Thedecrease in $T_{\mathrm{c}}$ with further Te substitution likely arises fromtoo strong electronic correlations, which are not favorable forsuperconductivity.

Evolution of charge dynamics in FeSe$_{1-x}$Te$_{x}$: Effects of electronic correlations and nematicity