Charge Crystals Created By Synthesizing A New Class of Endotaxial 2D Materials

The electrons of the sandwiched 2D TaS2 crystal layer spontaneously clumped together to form an ordered 2D charge crystal, known as a charge density wave—a repeating pattern in the distribution of electrons in a solid material.
Published in Materials and Physics
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Rather than the typical approach of exfoliating and peeling off individual atomic layers to make a 2D material, the researchers grew the 2D material inside of another matrix. The work has dubbed this new class of 2D materials "endotaxial" from the Greek roots "endo", meaning within, and "taxis", meaning in an ordered manner. Moreover, the electrons of the sandwiched 2D TaS2 crystal layer spontaneously clumped together to form their own 2D crystal, known a charge density wave—a repeating pattern in the distribution of electrons in a solid material.

Article Link: https://www.nature.com/articles/s41467-024-45711-3

Moreover, the electrons of the sandwiched 2D TaS2 crystal layer spontaneously clumped together to form their own 2D crystal, known a charge density wave—a repeating pattern in the distribution of electrons in a solid material.

Endotaxial TaS2 synthesized by Hovden et al

More specifically, an ordered incommensurate charge density wave (oIC-CDW) was 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.

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Electronic Materials
Physical Sciences > Chemistry > Materials Chemistry > Electronic Materials
Two-dimensional Materials
Physical Sciences > Physics and Astronomy > Condensed Matter Physics > Two-dimensional Materials
Transmission Electron Microscopy
Physical Sciences > Materials Science > Materials Characterization Technique > Microscopy > Transmission Electron Microscopy
Electron Microscopy
Physical Sciences > Materials Science > Materials Characterization Technique > Microscopy > Electron Microscopy

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