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We report on the Tomonaga-Luttinger liquid (TLL) behavior in fully degenerate1D Dirac fermions. A ternary van der Waals material Nb$_9$Si$_4$Te$_{18}$incorporates in-plane NbTe$_2$ chains, which produce a 1D Dirac band crossingFermi energy. Tunneling conductance of electrons confined within NbTe2 chainsis found to be substantially suppressed at Fermi energy, which follows a powerlaw with a universal temperature scaling, hallmarking a TLL state. The obtainedLuttinger parameter of ~0.15 indicates strong electron-electron interaction.The TLL behavior is found to be robust against atomic-scale defects, whichmight be related to the Dirac electron nature. These findings, as combined withthe tunability of the compound and the merit of a van der Waals material, offera robust, tunable, and integrable platform to exploit non-Fermi liquid physics.

Robust Luttinger liquid state of 1D Dirac fermions in a van der Waals system Nb$_9$Si$_4$Te$_{18}$