A novel $\sqrt{19}\times \sqrt{19}$ superstructure in epitaxially grown 1T-TaTe${}_2$

Abstract

The spontaneous formation of electronic orders is a crucial element for understanding complex quantum states and engineering heterostructures in two-dimensional materials. We report a novel $\sqrt{19}\times \sqrt{19}$ charge order in few-layer thick 1T-TaTe${}_2$ transition metal dichalcogenide films grown by molecular beam epitaxy, which has not been realized. Our photoemission and scanning probe measurements demonstrate that monolayer 1T-TaTe${}_2$ exhibits a variety of metastable charge density wave orders, including the $\sqrt{19}\times \sqrt{19}$ superstructure, which can be selectively stabilized by controlling the post-growth annealing temperature. Moreover, we find that only the $\sqrt{19}\times \sqrt{19}$ order persists in 1T-TaTe${}_2$ films thicker than a monolayer, up to 8 layers. Our findings identify the previously unrealized novel electronic order in a much-studied transition metal dichalcogenide and provide a viable route to control it within the epitaxial growth process.

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Cited by in corpus (7)

• Realization of multiple charge density waves in NbTe2 at the monolayer limit
• Metastable polymorphic phases in monolayer TaTe2
• Unusual ferromagnetic band evolution and high Curie temperature in monolayer 1T-CrTe2 on bilayer graphene
• Unveiling the orbital-selective electronic band reconstruction through the structural phase transition in TaTe${}_2$
• Femtosecond trimer quench cycled at megahertz rates in the unconventional charge-density wave material $1\text{T’}-{\text{TaTe}}_2$
• 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