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Metallic 1T Phase, 3d1 Electronic Configuration and Charge Density Wave Order in Molecular Beam Epitaxy Grown Monolayer Vanadium Ditelluride.

  • Author(s): Wong, Ping Kwan Johnny
  • Zhang, Wen
  • Zhou, Jun
  • Bussolotti, Fabio
  • Yin, Xinmao
  • Zhang, Lei
  • N'Diaye, Alpha T
  • Morton, Simon A
  • Chen, Wei
  • Goh, Johnson
  • de Jong, Michel P
  • Feng, Yuan Ping
  • Wee, Andrew TS
  • et al.
Abstract

We present a combined experimental and theoretical study of monolayer vanadium ditelluride, VTe2, grown on highly oriented pyrolytic graphite by molecular-beam epitaxy. Using various in situ microscopic and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, together with theoretical analysis by density functional theory calculations, we demonstrate direct evidence of the metallic 1T phase and 3d1 electronic configuration in monolayer VTe2 that also features a (4 × 4) charge density wave order at low temperatures. In contrast to previous theoretical predictions, our element-specific characterization by X-ray magnetic circular dichroism rules out a ferromagnetic order intrinsic to the monolayer. Our findings provide essential knowledge necessary for understanding this interesting yet less explored metallic monolayer in the emerging family of van der Waals magnets.

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