Direct Visualization of Trimerized States in 1T'-TaTe${}_2$

Abstract

Transition-metal dichalcogenides containing tellurium anions show remarkable charge-lattice modulated structures and prominent interlayer character. Using cryogenic scanning transmission electron microscopy (STEM), we map the atomic-scale structures of the high temperature (HT) and low temperature (LT) modulated phases in 1T'-TaTe${}_2$. At HT, we directly show in-plane metal distortions which form trimerized clusters and staggered, three-layer stacking. In the LT phase at 93 K, we visualize an additional trimerization of Ta sites and subtle distortions of Te sites by extracting structural information from contrast modulations in plan-view STEM data. Coupled with density functional theory calculations and image simulations, this approach opens the door for atomic-scale visualizations of low temperature phase transitions and complex displacements in a variety of layered systems.

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Cited by in corpus (12)

• A novel $\sqrt{19}\times \sqrt{19}$ superstructure in epitaxially grown 1T-TaTe${}_2$
• Metastable polymorphic phases in monolayer TaTe2
• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• Unveiling the orbital-selective electronic band reconstruction through the structural phase transition in TaTe${}_2$
• Atomic-scale tracking of topological defect motion and incommensurate charge order melting
• Real-space Visualization of Charge Density Wave Induced Local Inversion-Symmetry Breaking in a Skyrmion Magnet
• Broken symmetries associated with a Kagome chiral charge order
• Megahertz cycling of ultrafast structural dynamics enabled by nanosecond thermal dissipation
• Femtosecond trimer quench cycled at megahertz rates in the unconventional charge-density wave material $1\text{T’}-{\text{TaTe}}_2$
• Quantitative approaches for multi-scale structural analysis with atomic resolution electron microscopy
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
• The rich structural, electronic and bonding landscape of 1$T$-type TaTe${}_2$ single-layers