Скачать или смотреть Unlocking the Secrets of Twisted 1T′-Tungsten

Unlock the secrets of twisted 1T'-Tungsten Telluride (1T'-WTe2) - a new frontier in moire physics! Discover how the low symmetry and anisotropic lattice of this material can give rise to exotic electronic states in twisted bilayers. Witness the remarkable sensitivity to small strains, triggering the formation of a powerful confining potential wave that disrupts the electronic band structure. Explore the hidden potential of materials beyond the familiar hexagonal symmetries and get ready to witness the future of two-dimensional materials!

Research Paper: https://arxiv.org/pdf/2404.10557.pdf

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Citation:
Magorrian, S. J., & Hine, N. D. (2023). [Strain-dependent one-dimensional confinement channels in twisted bilayer 1T'-WTe2](https://arxiv.org/pdf/2404.10557.pdf). arXiv preprint arXiv:2404.10557.

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The study presents a combination of plane-wave and linear-scaling density functional theory calculations to investigate the electronic properties of twisted bilayer 1T′-Tungsten Telluride (1T′-WTe2), a material with low symmetry and an anisotropic lattice.


The reduced symmetry of the 1T′ phase of Tungsten Telluride (WTe2) leads to a rectangular moire pattern in the twisted bilayer, in contrast to the hexagonal patterns typically observed in twisted bilayers of materials with hexagonal symmetry.

The researchers find that for a small change (1%) in the lattice parameters of the constituent 1T′-Tungsten Telluride (1T′-WTe2) monolayers, a substantial moire-induced striped electrostatic potential landscape emerges in the twisted bilayer, with a peak-to-trough magnitude exceeding 200 millielectronvolts.

The unfolded spectral functions of the twisted bilayer reveal significant disruptions to the band structure due to the confining potential wave in the strained case, including the detachment of electron pocket minima from their bands and the splitting of a particularly flat valence band into a standing wave-like structure.

Calculations of band structures and Fermi surfaces for aligned bilayers with different local stacking environments show notable changes in electronic topology, both with changes in local stacking and on the application of a small strain.

The study suggests that the one-dimensional, striped nature of the moire pattern in twisted 1T′-Tungsten Telluride (1T′-WTe2) leads to an instability to the formation of a confining potential wave upon the application of a small strain, with significant consequences for the electronic properties.

The emergence of a strong, strain-induced confining potential wave in the twisted bilayer, with a magnitude exceeding 200 millielectronvolts, highlights the sensitivity of the electronic properties of 1T′-Tungsten Telluride (1T′-WTe2) to small structural changes. This could be exploited for the engineering of novel electronic states and functionalities.

The notable changes in electronic topology observed in the aligned bilayer calculations as a function of local stacking environment and strain suggest that the twisted bilayer may host a rich variety of correlated electronic phases that depend sensitively on the local atomic registry.

The computational results provide important theoretical support for the experimental observations of strongly anisotropic transport properties and Luttinger liquid behavior in twisted 1T′-Tungsten Telluride (1T′-WTe2) systems, stemming from the one-dimensional, striped nature of the moire pattern.

The findings suggest that materials isostructural to 1T′-Tungsten Telluride (1T′-WTe2), such as the quasi-one-dimensional tellurides Tantalum Osmium Telluride (Ta1.2Os0.8Te4) and Tantalum Iridium Telluride (TaIrTe4), may also exhibit similar phenomena arising from their low symmetry and anisotropic lattices.

The study highlights the importance of going beyond the traditional focus on twisted bilayers with hexagonal symmetry, and exploring the novel physics that can emerge in twisted systems with lower-symmetry constituents, such as the 1T′ phase of transition metal dichalcogenides.

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