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Rare-earth tri-tellurium RTe$_3$ is a typical quasi-two dimensional systemwhich exhibits obvious charge density wave (CDW) orders. So far, RTe$_3$ withheavier R ions (Dy, Ho, Er and Tm) are believed to experience two CDW phasetransitions, while the lighter ones only hold one. TbTe$_3$ is claimed tobelong to the latter. However in this work we present evidences that TbTe$_3$also possesses more than one CDW order. Aside from the one at 336 K, which wasextensively studied and reported to be driven by imperfect Fermi surfacenesting with a wave vector $q=(2/7 c^*)$, a new CDW energy gap (260 meV)develops at around 165 K, revealed by both infrared reflectivity spectroscopyand ultrafast pump-probe spectroscopy. More intriguingly, the origin of thisenergy gap is different from the second CDW order in the heavier R ions-basedcompounds RTe$_3$ (R=Dy, Ho, Er and Tm).

Revealing a new charge density wave order in TbTe$_3$ by optical conductivity and ultrafast pump-probe experiments