Experimental Evidence of Stable 2$H$ Phase on the Surface of Layered 1$T'$-TaTe$_2$

Indrani Kar; Kapildeb Dolui; Luminita Harnagea; Y. Kushnirenko; G. Shipunov; N. C. Plumb; M. Shi; B. Büchner; S. Thirupathaiah

doi:10.1021/acs.jpcc.0c10517

paper

Experimental Evidence of Stable 2 $H$ Phase on the Surface of Layered 1 $T^{'}$ -TaTe $_{2}$

arXiv:2009.00987 · doi:10.1021/acs.jpcc.0c10517

Abstract

We report on the low-energy electronic structure of Tantalum ditelluride (1 $T^{'}$ -TaTe $_{2}$ ), one of the charge density wave (CDW) materials from the group V transition metal dichalcogenides using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). We find that the Fermi surface topology of TaTe $_{2}$ is quite complicated compared to its isovalent compounds such as TaS $_{2}$ , TaSe $_{2}$ , and isostructural compound NbTe $_{2}$ . More importantly, we discover that the surface electronic structure of 1 $T^{'}$ -TaTe $_{2}$ has more resemblance to the 2 $H$ -TaTe $_{2}$ , while the bulk electronic structure has more resemblance to the hypothetical 1 $T$ -TaTe $_{2}$ . These experimental observations are thoroughly compared with our DFT calculations performed on 1 $T$ -, 2 $H$ - and 2 $H$ (monolayer)/1 $T$ - TaTe $_{2}$ . We further notice that the Fermi surface topology is temperature independent up to 180 K, confirming that the 2 $H$ phase on the surface is stable up to 180 K and the CDW order is not due to the Fermi surface nesting.

5 figures, 22 pages, Accepted for publication in JPCC

Experimental Evidence of Stable 2 $H$ Phase on the Surface of Layered 1 $T^{'}$ -TaTe $_{2}$

Abstract

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Experimental Evidence of Stable 2H Phase on the Surface of Layered 1T′-TaTe2​

Abstract

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Cited by in corpus (4)

Experimental Evidence of Stable 2 $H$ Phase on the Surface of Layered 1 $T^{'}$ -TaTe $_{2}$