We demonstrate how hybridization between a two-dimensional material and its substrate can lead to an apparent heavy doping, using the example of monolayer TaS2 grown on Au(111). Combining ab-initio calculations, scanning tunneling spectroscopy experiments and a generic model, we show that strong changes in Fermi areas can arise with much smaller actual charge transfer. This mechanism, which we refer to as pseudodoping, is a generic effect for metallic two-dimensional materials which are either adsorbed to metallic substrates or embedded in vertical heterostructures. It explains the apparent heavy doping of TaS2 on Au(111) observed in photoemission spectroscopy and spectroscopic signatures in scanning tunneling spectroscopy. Pseudodoping is associated with non-linear energy-dependent shifts of electronic spectra, which our scanning tunneling spectroscopy experiments reveal for clean and defective TaS2 monolayer on Au(111). The influence of pseudodoping on the formation of charge ordered, magnetic, or superconducting states is analyzed.
@article{arxiv.1807.00756,
title = {Pseudodoping of Metallic Two-Dimensional Materials by The Supporting Substrates},
author = {Bin Shao and Andreas Eich and Charlotte Sanders and Arlette S. Ngankeu and Marco Bianchi and Philip Hofmann and Alexander A. Khajetoorians and Tim O. Wehling},
journal= {arXiv preprint arXiv:1807.00756},
year = {2022}
}
Comments
arXiv admin note: substantial text overlap with arXiv:1609.00220