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The Weyl semimetal WTe$_{2}$ has shown several correlated electronicbehaviors, such as the quantum spin Hall effect, superconductivity,ferroelectricity, and a possible exciton insulator state, all of which can betuned by various physical and chemical approaches. Here, we discover a newelectronic phase in WTe$_{2}$ induced by lithium intercalation. The new phaseexhibits an increasing resistivity with decreasing temperature and its carrierdensity is almost two orders of magnitude lower than the carrier density of thesemi-metallic T$_{d}$ phase, probed by in situ Hall measurements as a functionof lithium intercalation. Our theoretical calculations predict the newlithiated phase to be a charge density wave (CDW) phase with a bandgap of ~0.14 eV, in good agreement with the in situ transport data. The new phase isstructurally distinct from the initial T$_{d}$ phase, characterized bypolarization angle-dependent Raman spectroscopy, and large lattice distortionsclose to 6 % are predicted in the new phase. Thus, we report the firstexperimental evidence of CDW in T$_{d}$-WTe$_{2}$, projecting WTe$_{2}$ as anew playground for studying the interplay between CDW and superconductivity.Our finding of a new gapped phase in a two-dimensional (2D) semi-metal alsodemonstrates electrochemical intercalation as a powerful tuning knob formodulating electron density and phase stability in 2D materials.

A Gapped Phase in Semimetallic T$_{d}$-WTe$_{2}$ Induced by Lithium Intercalation