Experimental Evidence of a Stable 2H Phase on the Surface of Layered 1T′-TaTe2Click to copy article linkArticle link copied!
- Indrani KarIndrani KarDepartment of Condensed Matter Physics and Material Sciences, S N Bose National Centre for Basic Sciences, Kolkata, West Bengal 700106, IndiaMore by Indrani Kar
- Kapildeb DoluiKapildeb DoluiDepartment of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-5600, United StatesMore by Kapildeb Dolui
- Luminita HarnageaLuminita HarnageaIndian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, IndiaMore by Luminita Harnagea
- Yevhen KushnirenkoYevhen KushnirenkoLeibniz-Institute for Solid State and Materials Research Dresden, P.O.Box 270116, D-01171, Dresden 01069, GermanyMore by Yevhen Kushnirenko
- Grigory ShipunovGrigory ShipunovLeibniz-Institute for Solid State and Materials Research Dresden, P.O.Box 270116, D-01171, Dresden 01069, GermanyMore by Grigory Shipunov
- Nicholas C. PlumbNicholas C. PlumbSwiss Light Source, Paul Scherrer Institute, Villigen PSI CH-5232, SwitzerlandMore by Nicholas C. Plumb
- Ming ShiMing ShiSwiss Light Source, Paul Scherrer Institute, Villigen PSI CH-5232, SwitzerlandMore by Ming Shi
- Bernd BüchnerBernd BüchnerLeibniz-Institute for Solid State and Materials Research Dresden, P.O.Box 270116, D-01171, Dresden 01069, GermanyMore by Bernd Büchner
- Setti Thirupathaiah*Setti Thirupathaiah*Email: [email protected]Department of Condensed Matter Physics and Material Sciences, S N Bose National Centre for Basic Sciences, Kolkata, West Bengal 700106, IndiaMore by Setti Thirupathaiah
Abstract
We report on the low-energy electronic structure of tantalum ditelluride (1T′-TaTe2), one of the charge density wave (CDW) materials from the group V transition metal dichalcogenides using angle-resolved photoemission spectroscopy and density functional theory (DFT). We find that the Fermi surface topology of TaTe2 is quite complicated compared to its isovalent compounds such as TaS2, TaSe2, and isostructural compound NbTe2. Most importantly, we discover that the surface electronic structure of 1T′-TaTe2 has more resemblance to the 2H-TaTe2, while the bulk electronic structure has more resemblance to the hypothetical 1T-TaTe2. These experimental observations are thoroughly compared with our DFT calculations performed on 1T-, 2H-, and 2H (monolayer)/1T-TaTe2. We further notice that the Fermi surface topology is temperature independent up to 180 K, confirming that the 2H phase on the surface is stable up to 180 K and the CDW order is not due to the Fermi surface nesting.
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