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Two-dimensional (2D) palladium ditelluride (PdTe2) and platinum ditelluride(PtTe2) are two Dirac semimetals which demonstrate fascinating quantumproperties such as superconductivity, magnetism and topological order,illustrating promising applications in future nanoelectronics andoptoelectronics. However, the synthesis of their monolayers is dramaticallyhindered by strong interlayer coupling and orbital hybridization. In thisstudy, an efficient synthesis method for monolayer PdTe2 and PtTe2 isdemonstrated. Taking advantages of the surface reaction, epitaxial growth oflarge-area and high quality monolayers of PdTe2 and patterned PtTe2 is achievedby direct tellurization of Pd(111) and Pt(111). A well-ordered PtTe2 patternwith Kagome lattice formed by Te vacancy arrays is successfully grown.Moreover, multilayer PtTe2 can be also obtained and potential excitation ofDirac plasmons is observed. The simple and reliable growth procedure ofmonolayer PdTe2 and patterned PtTe2 gives unprecedented opportunities forinvestigating new quantum phenomena and facilitating practical applications inoptoelectronics.

Epitaxial Growth of Monolayer PdTe2 and Patterned PtTe2 by Direct Tellurization of Pd and Pt surfaces