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Article Dans Une Revue 2D Materials Année : 2020

Evidence of new 2D material: Cu2Te

Yongfeng Tong
  • Fonction : Auteur
Meryem Bouaziz
  • Fonction : Auteur
Wei Zhang
  • Fonction : Auteur
Baydaa Obeid
  • Fonction : Auteur
Antoine Loncle
  • Fonction : Auteur
Hanna Enriquez
  • Fonction : Auteur
Karine Chaouchi
  • Fonction : Auteur
Vladimir Esaulov
  • Fonction : Auteur
Zhesheng Chen
Heqi Xiong
  • Fonction : Auteur
Yingchun Cheng
  • Fonction : Auteur
  • PersonId : 1103431
Azzedine Bendounan

Résumé

The number of two-dimensional (2D) materials has grown steadily since the discovery of graphene. Each new 2D material demonstrated unusual physical properties offering a large flexibility in their tailoring for high-tech applications. Here, we report on the formation and characterization of an uncharted 2D material: 'Cu 2 Te alloy monolayer on Cu(111) surface'. We have successfully grown a 2D binary Te-Cu alloy using a straightforward approach based on chemical deposition method. Low electron energy diffraction (LEED) and scanning tunneling microscopy (STM) results reveal the existence of a well-ordered alloy monolayer characterized by (√3 × √3)R30 • superstructure, while the x-ray photoemission spectroscopy (XPS) measurements indicate the presence of single chemical environment of the Te atoms associated with the Te-Cu bonding. Analysis of the valence band properties by angle resolved photoemission spectroscopy (ARPES); in particular the electronic states close to the Fermi level suggests a strong hybridization between Te and Cu electronic states leading to an appearance of new dispersive bands localized at the surface alloy, which is confirmed by first-principles calculations. These bands are strongly influenced by the surface reconstruction and undergo a back-folding at the boundaries of the reduced surface Brillouin zone (SBZ). More interesting, a band gap of about 0.91 eV and a Rashba splitting in the conduction band are obtained. These findings taken together clearly prove the presence of 2D-type electron system within the Cu 2 Te alloy layer, which is promising for spintronic application.
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Dates et versions

hal-04382298 , version 1 (09-01-2024)

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Yongfeng Tong, Meryem Bouaziz, Wei Zhang, Baydaa Obeid, Antoine Loncle, et al.. Evidence of new 2D material: Cu2Te. 2D Materials, 2020, 7, ⟨10.1088/2053-1583/ab8918⟩. ⟨hal-04382298⟩
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