Fermi Surface Evolution Across Multiple CDW Transitions in RTe$_{3}$

The Fermi surface (FS) evolution across multiple charge density wave (CDW) transitions is investigated using angle-resolved photoemission spectroscopy. Low temperature measurements reveal two incommensurate CDW gaps created by perpendicular FS nesting vectors. A larger gap ($\sim $250 meV) arising from a CDW with q$_{CDW}\sim $0.7c* is in good agreement with the expected trend determined from light rare earth members of the bi-layer family of rare earth tritelluride compounds (RTe$_{3})$. A second, smaller gap ($\sim $50 meV) is due to a second CDW with q$_{CDW}\sim $0.7a* never before seen in other RTe$_{3}$ compounds. The temperature dependence of the FS and the two CDW gaps is characterized.