Pseudodoping of Metallic Two-Dimensional Materials by The Supporting Substrates

Abstract

We demonstrate how hybridization between a two-dimensional material and its substrate can lead to an apparent heavy doping, using the example of monolayer TaS${}_2$ grown on Au(111). Combining $\text{ab-initio}$ 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 TaS${}_2$ 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 TaS${}_2$ monolayer on Au(111). The influence of pseudodoping on the formation of charge ordered, magnetic, or superconducting states is analyzed.

arXiv commentarXiv admin note: substantial text overlap with arXiv:1609.00220

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• Roles of the Narrow Electronic Band near the Fermi Level in 1T-TaS${}_2$-Related Layered Materials
• In-situ exfoliation method of large-area 2D materials
• Photoexcitation Induced Quantum Dynamics of Charge Density Wave and Emergence of a Collective Mode in 1T-TaS${}_2$
• Mott insulator tuning via structural distortion in monolayer 1T-NbSe2
• Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact
• Nanoscale patterning of quasiparticle band alignment
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• Correlation-induced magnetism in substrate-supported 2D metal-organic frameworks
• Ab initio phonon self-energies and fluctuation diagnostics of phonon anomalies: Lattice instabilities from Dirac pseudospin physics in transition metal dichalcogenides
• Substrate-induced suppression of charge density wave in monolayer 1H-TaS2 on Au(111)
• Metal-insulator transition in monolayer MoS${}_2$ via contactless chemical doping
• Coulomb Engineering of two-dimensional Mott materials
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• Emergent charge density wave featuring quasi-one-dimensional chains in Ta-intercalated bilayer 2$H$-TaS${}_2$ with coexisting superconductivity
• Moiré induced electronic structure modifications in monolayer V${}_2$S${}_3$ on Au(111)