Two-dimensional charge order stabilized in clean polytype heterostructures

Suk Hyun Sung, Noah Schnitzer, Steve Novakov, Ismail El Baggari, Xiangpeng Luo, Jiseok Gim, Nguyen M. Vu, Zidong Li, Todd H. Brintlinger, Yu Liu, Wenjian Lu, Yuping Sun, Parag B. Deotare, Kai Sun, Liuyan Zhao, Lena F. Kourkoutis, John T. Heron and Robert Hovden ()
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Suk Hyun Sung: University of Michigan
Noah Schnitzer: Cornell University
Steve Novakov: University of Michigan
Ismail El Baggari: Cornell University
Xiangpeng Luo: University of Michigan
Jiseok Gim: University of Michigan
Nguyen M. Vu: University of Michigan
Zidong Li: University of Michigan
Todd H. Brintlinger: U.S. Naval Research Laboratory
Yu Liu: Chinese Academy of Sciences
Wenjian Lu: Chinese Academy of Sciences
Yuping Sun: Chinese Academy of Sciences
Parag B. Deotare: University of Michigan
Kai Sun: University of Michigan
Liuyan Zhao: University of Michigan
Lena F. Kourkoutis: Kavli Institute at Cornell for Nanoscale Science
John T. Heron: University of Michigan
Robert Hovden: University of Michigan

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Compelling evidence suggests distinct correlated electron behavior may exist only in clean 2D materials such as 1T-TaS2. Unfortunately, experiment and theory suggest that extrinsic disorder in free standing 2D layers disrupts correlation-driven quantum behavior. Here we demonstrate a route to realizing fragile 2D quantum states through endotaxial polytype engineering of van der Waals materials. The true isolation of 2D charge density waves (CDWs) between metallic layers stabilizes commensurate long-range order and lifts the coupling between neighboring CDW layers to restore mirror symmetries via interlayer CDW twinning. The twinned-commensurate charge density wave (tC-CDW) reported herein has a single metal–insulator phase transition at ~350 K as measured structurally and electronically. Fast in-situ transmission electron microscopy and scanned nanobeam diffraction map the formation of tC-CDWs. This work introduces endotaxial polytype engineering of van der Waals materials to access latent 2D ground states distinct from conventional 2D fabrication.

Date: 2022
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DOI: 10.1038/s41467-021-27947-5

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