Kavli Affiliate: Michael F. Crommie
| First 5 Authors: Jinwoong Hwang, Yeongrok Jin, Canxun Zhang, Tiancong Zhu, Kyoo Kim
| Summary:
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 $sqrt{19}timessqrt{19}$ 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
$sqrt{19}timessqrt{19}$ superstructure, which can be selectively stabilized
by controlling the post-growth annealing temperature. Moreover, we find that
only the $sqrt{19}timessqrt{19}$ 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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