Robust Luttinger Liquid State of 1D Dirac Fermions in a Van der Waals System Nb<sub>9</sub>Si<sub>4</sub>Te<sub>18</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 37624091.
- Also identified by DOI 10.1021/acs.nanolett.3c01789.
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Abstract
We report on the Tomonaga-Luttinger liquid (TLL) behavior in fully degenerate 1D Dirac Fermions. A ternary van der Waals material Nb<sub>9</sub>Si<sub>4</sub>Te<sub>18</sub> incorporates in-plane NbTe<sub>2</sub> chains, which produce a 1D Dirac band crossing Fermi energy. Tunneling conductance of electrons confined within NbTe<sub>2</sub> chains is found to be substantially suppressed at Fermi energy, which follows a power law with a universal temperature scaling, hallmarking a TLL state. The obtained Luttinger parameter of ∼0.15 indicates a strong electron-electron interaction. The TLL behavior is found to be robust against atomic-scale defects, which might be related to the Dirac electron nature. These findings, combined with the tunability of the compound and the merit of a van der Waals material, offer a robust, tunable, and integrable platform to exploit non-Fermi liquid physics.