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.; Ding, Y.; Xu, Y.; He, S.; Zhao, L.; Liu, G.; Dong, X.; Zhang, J.; Chen, C.; Xu, Z.; Weng, H.; Dai, X.; Fang, Z.; Zhou, X.

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

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Yu, L.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Lin, C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Ding, Y.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Xu, Y.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Zhang, J.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Chen, C.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Zhou, X.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CA1E-E

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.