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  Identification of Topological Surface State in PdTe2 Superconductor by Angle-Resolved Photoemission Spectroscopy

Liu, Y., Zhao, J., Yu, L., Lin, C. T., Liang, A., Hu, C., et al. (2015). Identification of Topological Surface State in PdTe2 Superconductor by Angle-Resolved Photoemission Spectroscopy. Chinese Physics Letters, 32(6): 067303.

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 Creators:
Liu, Y., Author
Zhao, J., Author
Yu, L.1, 2, Author           
Lin, C. T.3, Author           
Liang, A., Author
Hu, C., Author
Ding, Y.4, Author           
Xu, Y.4, Author           
He, S., Author
Zhao, L., Author
Liu, G., Author
Dong, X., Author
Zhang, J.5, 6, Author           
Chen, C.4, 7, Author           
Xu, Z., Author
Weng, H., Author
Dai, X., Author
Fang, Z., Author
Zhou, X.3, Author           
Affiliations:
1Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370497              
2Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370480              
3Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370496              
4Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              
5Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370486              
6Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370481              
7Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370500              

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 Abstract: High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a T-c at 1.7 K. Combined with theoretical calculations, we discover for the first time the existence of topologically nontrivial surface state with Dirac cone in PbTe2 superconductor. It is located at the Brillouin zone center and possesses helical spin texture. Distinct from the usual three-dimensional topological insulators where the Dirac cone of the surface state lies at the Fermi level, the Dirac point of the surface state in PdTe2 lies deeply below the Fermi level at similar to 1.75 eV binding energy and is well separated from the bulk states. The identification of topological surface state in PdTe2 superconductor deeply below the Fermi level provides a unique system to explore new phenomena and properties and opens a door for finding new topological materials in transition metal chalcogenides.

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Language(s): eng - English
 Dates: 2015
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 713660
ISI: 000358597200034
 Degree: -

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Title: Chinese Physics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 32 (6) Sequence Number: 067303 Start / End Page: - Identifier: ISSN: 0256-307X