Pseudodoping of a metallic two-dimensional material by the supporting substrate

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  • Bin Shao, Universitat Bremen
  • ,
  • Andreas Eich, Radboud University Nijmegen
  • ,
  • Charlotte Sanders, Rutherford Appleton Laboratory
  • ,
  • Arlette S. Ngankeu
  • ,
  • Marco Bianchi
  • Philip Hofmann
  • Alexander A. Khajetoorians, Radboud University Nijmegen
  • ,
  • Tim O. Wehling, Universitat Bremen

Charge transfers resulting from weak bondings between two-dimensional materials and the supporting substrates are often tacitly associated with their work function differences. In this context, two-dimensional materials could be normally doped at relatively low levels. Here, we demonstrate how even weak hybridization with substrates can lead to an apparent heavy doping, using the example of monolayer 1H-TaS 2 grown on Au(111). Ab-initio calculations show that sizable changes in Fermi areas can arise, while the transferred charge between substrate and two-dimensional material is much smaller than the variation of Fermi areas suggests. This mechanism, which we refer to as pseudodoping, is associated with non-linear energy-dependent shifts of electronic spectra, which our scanning tunneling spectroscopy experiments reveal for clean and defective TaS 2 monolayer on Au(111). The influence of pseudodoping on the formation of many-body states in two-dimensional metallic materials is analyzed, shedding light on utilizing pseudodoping to control electronic phase diagrams.

Original languageEnglish
Article number180
JournalNature Communications
Number of pages7
Publication statusPublished - 2019

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