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

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [4];  [5];  [2]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. University of Michigan, Ann Arbor, MI (United States); OSTI
  2. University of Michigan, Ann Arbor, MI (United States)
  3. Rowland Institute at Harvard, Cambridge, MA (United States)
  4. Harvard University, Cambridge, MA (United States)
  5. Cornell University, Ithaca, NY (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States)
  6. Chinese Academy of Sciences, Hefei (China)
  7. Chinese Academy of Sciences, Hefei (China); Nanjing University (China); Chinese Academy of Sciences, Hefei (China)
  8. Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States); Cornell University, Ithaca, NY (United States)

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.

Research Organization:
University of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Key R&D Program; National Natural Science Foundation of China
Grant/Contract Number:
SC0024147
OSTI ID:
2472071
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Data for Endotaxial Stabilization of 2D Charge Density Waves with Long-range Order image January 2024