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We performed optical spectroscopy measurement on single crystal of CeTe$_3$,a rare-earth element tri-telluride charge density wave (CDW) compound. Theoptical spectra are found to display very strong temperature dependence.Besides a large and pronounced CDW energy gap being present already at roomtemperature as observed in earlier studies, the present measurement revealedthe formation of another energy gap at smaller energy scale at low temperature.The second CDW gap removes the electrons near E$_F$ which undergo strongerscattering. The study yields evidence for the presence of multiple CDW ordersor strong fluctuations in the light rare-earth element tri-telluride.

Optical spectroscopy study on CeTe$_3$: evidence for multiple charge-density-wave orders