Endotaxial Stabilization of 2D Charge Density Waves with Long-range Order

Abstract

Charge density waves are emergent quantum states that spontaneously reduce crystal symmetry, drive metal-insulator transitions, and precede superconductivity. In low-dimensions, distinct quantum states arise, however, thermal fluctuations and external disorder destroy long-range order. Here we stabilize ordered two-dimensional (2D) charge density waves through endotaxial synthesis of confined monolayers of 1T-TaS${}_2$. Specifically, an ordered incommensurate charge density wave (oIC-CDW) is realized in 2D with dramatically enhanced amplitude and resistivity. By enhancing CDW order, the hexatic nature of charge density waves becomes observable. Upon heating via in-situ TEM, the CDW continuously melts in a reversible hexatic process wherein topological defects form in the charge density wave. From these results, new regimes of the CDW phase diagram for 1T-TaS${}_2$ are derived and consistent with the predicted emergence of vestigial quantum order.

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Cited by in corpus (2)

• Delayed 1T to 2H Phase Transition Upon Electrochemical Delithiation of LiMoS2
• Spatial correlations of charge density wave order across the transition in 2H-NbSe2