Endotaxial stabilization of 2D charge density waves with long-range order

Suk Hyun Sung, Nishkarsh Agarwal, Ismail El Baggari, Patrick Kezer, Yin Min Goh, Noah Schnitzer, Jeremy M. Shen, Tony Chiang, Yu Liu, Wenjian Lu, Yuping Sun, Lena F. Kourkoutis, John T. Heron, Kai Sun and Robert Hovden ()
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Suk Hyun Sung: University of Michigan
Nishkarsh Agarwal: University of Michigan
Ismail El Baggari: Rowland Institute at Harvard
Patrick Kezer: University of Michigan
Yin Min Goh: Harvard University
Noah Schnitzer: Cornell University
Jeremy M. Shen: University of Michigan
Tony Chiang: University of Michigan
Yu Liu: Chinese Academy of Sciences
Wenjian Lu: Chinese Academy of Sciences
Yuping Sun: Chinese Academy of Sciences
Lena F. Kourkoutis: Kavli Institute at Cornell for Nanoscale Science
John T. Heron: University of Michigan
Kai Sun: University of Michigan
Robert Hovden: University of Michigan

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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-TaS2. 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-TaS2 are derived and consistent with the predicted emergence of vestigial quantum order.

Date: 2024
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DOI: 10.1038/s41467-024-45711-3

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