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Charge transfer between van der Waals coupled metallic 2D layers.

Bharti Matta1, Philipp Rosenzweig1,2, Craig Polley3

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Potassium adsorption on graphene/lead heterostructures significantly n-dopes graphene and transfers electrons to the lead monolayer. Approximately 44% of donated electrons move to the lead layer, influencing quantum system engineering.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Van der Waals heterostructures enable engineering of novel quantum systems by stacking two-dimensional (2D) materials.
  • Understanding interlayer interactions and charge transfer is crucial, especially in complex multi-layer systems.
  • Graphene and transition metal dichalcogenides are key 2D materials with tunable electronic properties.

Purpose of the Study:

  • To investigate charge transfer in a potassium-adlayer/graphene/lead-monolayer heterostructure on a SiC substrate.
  • To quantify electron donation from potassium and its distribution between graphene and the lead monolayer.
  • To explore the potential for precise control over electronic properties in complex 2D material stacks.

Main Methods:

  • Synchrotron-based angle-resolved photoemission spectroscopy (ARPES) was employed.
  • Band structure analysis of individual layers within the heterostructure was performed.
  • Quantification of charge carriers donated by the potassium adlayer was determined based on its overlayer structure.

Main Results:

  • Potassium adsorption resulted in significant n-doping of the adjacent graphene layer.
  • A substantial portion of electrons transferred from potassium into the lead (Pb) monolayer.
  • Approximately 44% of donated electrons moved to the Pb layer, while 56% remained in graphene.

Conclusions:

  • Potassium adlayers effectively modulate the electronic properties of both graphene and adjacent lead monolayers in heterostructures.
  • This study demonstrates a mechanism for controlling charge distribution in multi-layer 2D material systems.
  • Findings provide insights into designing advanced heterostructures with tailored electronic functionalities.